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Vieira VTL, Jaime A, Puente CG, Soimu G, Silva EJNL, Elias CN, de Deus G. Reciprocating Torsional Fatigue and Mechanical Tests of Thermal-Treated Nickel Titanium Instruments. J Endod 2025; 51:359-366. [PMID: 39725370 DOI: 10.1016/j.joen.2024.12.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2024] [Revised: 12/17/2024] [Accepted: 12/18/2024] [Indexed: 12/28/2024]
Abstract
INTRODUCTION This study aimed to evaluate the mechanical properties of Reciproc, Reciproc Blue, One RECI, and R-Motion, specifically focusing on their flexibility and buckling resistance and to assess their torsional fatigue behavior under 2 different reciprocation angles (150°/30° or 70°/30°). METHODS A total of 160 instruments (40 per brand) were tested. Flexion and buckling tests were conducted using a Universal testing machine (DL 200 MF). For the flexion test, instruments were positioned at a 45° angle and flexed toward the ground plane. In the buckling test, the load was applied along the instrument's axis. A 20 N load cell and a test speed of 15 mm/s were used for both tests. Torsion test was performed using a torsiometer. The test speed was 100 rpm and the instruments were driven by an endodontic motor in 150°/30° and 70°/30° reciprocating angles. One-way analysis of variance post hoc Tukey tests and Student's t test were used for statistical comparisons (α = 5%). RESULTS The instruments exhibited significant differences in flexibility (P < .05), with One RECI demonstrating the highest flexibility and Reciproc the lowest. In terms of buckling resistance, Reciproc showed the highest values, while One RECI had the lowest (P < .05). Reciproc and Reciproc Blue displayed greater torque to fracture compared to One RECI and R-Motion (P < .05). Reducing the reciprocation angle did not affect the torque to fracture (P > .05). However, the reduced angle of 70°/30° significantly increased the time to fracture for all instruments when compared to angle of 150°/30° (P < .05). CONCLUSIONS The tested instruments demonstrated notable differences in their mechanical performance, highlighting variability in flexibility, buckling resistance, and torsional behavior. Reducing the reciprocation angle prolonged the time to fracture without affecting maximum torque, underscoring the influence of reciprocation kinematics on instrument performance.
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Affiliation(s)
- Victor Talarico Leal Vieira
- School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, Brazil; Material Science Department. Military Institute of Engineering, Rio de Janeiro, Rio de Janeiro, Brazil; Department of Endodontics, Fluminense Federal University, Niteroi, Brazil.
| | - Alejandro Jaime
- Department of Endodontics, Maimonides University (UMAI), Buenos Aires, Argentina
| | - Carlos Garcia Puente
- Department of Endodontics, Maimonides University (UMAI), Buenos Aires, Argentina
| | - Giuliana Soimu
- School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, Brazil
| | - Emmanuel João Nogueira Leal Silva
- School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, Brazil; Department of Endodontics, Fluminense Federal University, Niteroi, Brazil
| | - Carlos Nelson Elias
- Material Science Department. Military Institute of Engineering, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gustavo de Deus
- Department of Endodontics, Fluminense Federal University, Niteroi, Brazil
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De-Deus G, Palhares GA, Silva EJNLD, Belladonna FG, Oliveira DDS, Carvalho KD, Souza EM, Versiani MA. Effects of a pre-enlargement on fracture incidence of reused reciprocating instruments: A clinical study. Braz Dent J 2024; 35:e246147. [PMID: 39699503 DOI: 10.1590/0103-644020246147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2024] [Accepted: 09/30/2024] [Indexed: 12/20/2024] Open
Abstract
This study assessed the impact of pre-enlarging the root canal using a size 25 K-file on the fracture incidence of three reciprocating instruments after multiple uses. After a glide path performed with a size 15 K-file, the instruments (Reciproc R25, Reciproc Blue R25, and WaveOne Gold Primary) were initially used in 936 root canals. Then, for the second and third uses (933 and 927, respectively), a pre-enlargement using a size 25 K-file at the working length was done. Periapical radiographs assessed fragment location and length, and chi-square tests compared observed and expected frequencies (α = 5%). The fracture incidence during reuse ranged from 0% to 0.64%. Reciproc did not fracture during reuse (P = 0.99), but experienced two fractures in the third use (P = 0.000). Reciproc Blue and WaveOne Gold each had one fracture during the second (P = 0.000) and third (P = 0.000) uses. Following a pre-enlargement using a size 25 K-file for the second and third uses in 1,860 canals, only 6 instruments fractured (0.32%), suggesting that this approach may prolong the lifespan of these instruments and serve as an alternative for their reuse with a reduced risk of fracture.
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Affiliation(s)
- Gustavo De-Deus
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | | | - Emmanuel João Nogueira Leal da Silva
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
- Department of Endodontics, State University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | | | - Kilber Duarte Carvalho
- Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | - Erick Miranda Souza
- Department of Dentistry II, Federal University of Maranhão, São Luís, Maranhão, Brazil
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Algarni Y. Fracture Incidence of New Reciprocating Nickel-Titanium (NiTi) Files: A Cross-Sectional Retrospective Study. Cureus 2024; 16:e67762. [PMID: 39323712 PMCID: PMC11422514 DOI: 10.7759/cureus.67762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/24/2024] [Indexed: 09/27/2024] Open
Abstract
Aim This study aimed to evaluate the frequency of fractures in a new single-file reciprocating system used by endodontists. Methods Reciprocal systems were used to evaluate endodontist-treated patients' periapical radiographs and dental records. For the study, the kind of tooth, the quantity of root canals completed, the quantity of broken instruments, and the fragment's size were all recorded. A fracture risk calculation was made for every kind of tooth, root canal, and root third. The new reciprocating systems' fracture incidence was compared at a 5% significant level using the chi-squared test varied between 2 and 6 mm. Results There were a total of 5,066 root canals (2,128 teeth) from 1,818 patients. In single-file reciprocating systems, the incidence of fractured files relative to the number of instrumented canals was 22 (0.43%). The mesiobuccal root canal of mandibular molars and maxillary molars had the greatest breakage rates, which were 7 (36%) and 6 (27%), respectively. Conclusion The incidence of instrument fractures was lowered when linked to the usage of the Premium Blue reciprocating system in endodontic therapy.
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Bürklein S, Maßmann P, Schäfer E, Donnermeyer D. Cyclic Fatigue of Different Reciprocating Endodontic Instruments Using Matching Artificial Root Canals at Body Temperature In Vitro. MATERIALS (BASEL, SWITZERLAND) 2024; 17:827. [PMID: 38399077 PMCID: PMC10890344 DOI: 10.3390/ma17040827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 02/05/2024] [Accepted: 02/07/2024] [Indexed: 02/25/2024]
Abstract
Reciprocating motion expands the lifetime of endodontic instruments during the preparation of severely curved root canals. This study aimed to investigate the time to fracture (TTF) and number of cycles to failure (NCF) of different reciprocating instruments (n = 20 in each group) at body temperature using a dynamic testing model (amplitude = 3 mm). Reciproc Blue (RPB), size 25/.08, WaveOne Gold (WOG) 25/.07, Procodile (Proc) 25/.06, R-Motion (RM_06) 25/.06 and R-Motion (RM_04) 30/.04 instruments were tested in their specific reciprocating motion in artificial matching root canals (size of the instrument ± 0.02 mm; angle of curvature 60°, radius 5.0 mm, and centre of curvature 5.0 mm from apical endpoint). The number of fractured instruments, TTF, NCF, the and lengths of the fractured instruments were recorded and statistically analysed using the Chi-Square or Kruskal-Wallis test. Both TTF (median 720, 643, 562, 406, 254 s) and the NCF (3600, 3215, 2810, 2032, 1482 cycles) decreased in the following order RM_06 > RPB > RM_04 > Proc > WOG with partially significant differences. During testing, only six RM_06 instruments fractured, whereas 16/20 (RPB), 18/20 (Proc), and 20/20 (RM_04, WOG) fractures were recorded (p < 0.05). Within the limitations of the present study, blue-coloured RPB and RM instruments exhibited a significantly superior cyclic fatigue resistance compared to SE-NiTi and Gold-wire instruments. Heat treatment, cross-sectional design and core mass significantly influenced the longevity of reciprocating instruments in cyclic dynamic testing.
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Affiliation(s)
- Sebastian Bürklein
- Central Interdisciplinary Ambulance in the School of Dentistry, University of Münster, 48149 Münster, Germany; (S.B.); (P.M.); (E.S.)
| | - Paul Maßmann
- Central Interdisciplinary Ambulance in the School of Dentistry, University of Münster, 48149 Münster, Germany; (S.B.); (P.M.); (E.S.)
| | - Edgar Schäfer
- Central Interdisciplinary Ambulance in the School of Dentistry, University of Münster, 48149 Münster, Germany; (S.B.); (P.M.); (E.S.)
| | - David Donnermeyer
- Department of Periodontology and Operative Dentistry, University of Münster, 48149 Münster, Germany
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De Pedro-Muñoz A, Rico-Romano C, Sánchez-Llobet P, Montiel-Company JM, Mena-Álvarez J. Cyclic Fatigue Resistance of Rotary versus Reciprocating Endodontic Files: A Systematic Review and Meta-Analysis. J Clin Med 2024; 13:882. [PMID: 38337577 PMCID: PMC10856014 DOI: 10.3390/jcm13030882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 01/30/2024] [Accepted: 01/31/2024] [Indexed: 02/12/2024] Open
Abstract
(1) Background: The failure of nickel-titanium (NiTi) rotary files is a complication related to endodontic instruments. The aim of this study was to compare the resistance to cyclic fatigue between rotary and reciprocating file systems. (2) Methods: Specific PICO: Population (P): artificial root canals; Interventions (I): instrumentation with NiTi rotary and reciprocating files; Comparison (C): rotary versus reciprocating files; Outcome (O): cyclic fatigue resistance. Studies were identified through bibliographic research using electronic databases (Medline, Embase, Scopus, SciELO, and WOS). The studies were combined using a random effects model by the inverse variance method. The effect size was the mean of the time to fracture (TTF) and number of cycles to fracture (NCF). Heterogeneity was assessed using the p value of the Q test for heterogeneity and the I2. (3) Results: TTF for rotary files was determined in 474.5 s and 839.1 for reciprocating without statistically significant differences. NCF for rotary systems was determined in 1444.2 and for reciprocating file systems in 4155.9 with statistically significant differences (p = 0.035), making reciprocating files more resistant. (4) Conclusions: Reciprocating files have better resistance to cyclic fatigue than rotary files. When tested in double curvature canals, reciprocating files also showed higher resistance.
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Affiliation(s)
- Ana De Pedro-Muñoz
- Department of Endodontics, Faculty of Dentistry, Alfonso X El Sabio University, 28691 Madrid, Spain; (A.D.P.-M.); (C.R.-R.); (P.S.-L.)
| | - Cristina Rico-Romano
- Department of Endodontics, Faculty of Dentistry, Alfonso X El Sabio University, 28691 Madrid, Spain; (A.D.P.-M.); (C.R.-R.); (P.S.-L.)
| | - Patricia Sánchez-Llobet
- Department of Endodontics, Faculty of Dentistry, Alfonso X El Sabio University, 28691 Madrid, Spain; (A.D.P.-M.); (C.R.-R.); (P.S.-L.)
| | - José María Montiel-Company
- Department of Stomatology, Faculty of Medicine and Dentistry, University of Valencia, 46010 Valencia, Spain;
| | - Jesús Mena-Álvarez
- Department of Endodontics, Faculty of Dentistry, Alfonso X El Sabio University, 28691 Madrid, Spain; (A.D.P.-M.); (C.R.-R.); (P.S.-L.)
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Youssef E, Jungbluth H, Jepsen S, Gruener M, Bourauel C. Comparing Cyclic Fatigue Resistance and Free Recovery Transformation Temperature of NiTi Endodontic Single-File Systems Using a Novel Testing Setup. MATERIALS (BASEL, SWITZERLAND) 2024; 17:566. [PMID: 38591373 PMCID: PMC10856488 DOI: 10.3390/ma17030566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 01/05/2024] [Accepted: 01/22/2024] [Indexed: 04/10/2024]
Abstract
The aim of this study was to assess the effect of body temperature (37 °C) on the cyclic fatigue resistance of three endodontic single-file systems using a new testing setup. One Shape® new generation (OS), WaveOne™ (WO) and WaveOne® GOLD (WOG), which are made from different NiTi alloys and operated in different motions (rotation/reciprocation), were evaluated. The study design included four groups. Each group comprised 30 files, 10 files of each of the three file systems, tested at 20 ± 2 °C (group 1 and 3) and at 37 ± 1 °C (group 2 and 4). All files were tested in a custom-made metal block with artificial canals of 60° angle, and a 5 mm and 3 mm radius of curvature, respectively. A heating element was attached to replicate a temperature of 37 °C. Files were introduced 18 mm into the canals and operated until failure. Transformation temperatures of five samples of each of the tested file systems were determined via the bend and free recovery (BFR) method. With the exception of WOG in canals with a 3 mm radius of curvature (p = 0.075), all the tested file systems showed statistically significantly less time needed to fracture when operated at 37 ± 1 °C compared to at 20 ± 2 °C in canals with a 5 mm and 3 mm radius of curvature using Mann-Whitney U test (p < 0.05). All file systems showed transformation temperatures below the body temperature. We concluded that body temperature directly affects the cyclic fatigue resistance of all tested file systems. Bend and free recovery can be suitable for the determination of austenite finish temperatures (Af) of endodontic instruments as it allows testing a longer portion of the instrument.
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Affiliation(s)
- Emad Youssef
- Department of Periodontology, Operative and Preventive Dentistry, University of Bonn, 53111 Bonn, Germany
- Department of Oral Technology, Faculty of Medicine, University of Bonn, 53111 Bonn, Germany
| | - Holger Jungbluth
- Department of Periodontology, Operative and Preventive Dentistry, University of Bonn, 53111 Bonn, Germany
| | - Søren Jepsen
- Department of Periodontology, Operative and Preventive Dentistry, University of Bonn, 53111 Bonn, Germany
| | - Manfred Gruener
- Department of Oral Technology, Faculty of Medicine, University of Bonn, 53111 Bonn, Germany
| | - Christoph Bourauel
- Department of Oral Technology, Faculty of Medicine, University of Bonn, 53111 Bonn, Germany
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Reynette C, Giess R, Davril J, Martrette JM, Mortier É, Balthazard R, Vincent M. Influence of endodontic motors on the behaviour of root canal shaping instruments: an in vitro comparative study. BDJ Open 2023; 9:51. [PMID: 38030624 PMCID: PMC10687023 DOI: 10.1038/s41405-023-00179-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 10/30/2023] [Accepted: 10/30/2023] [Indexed: 12/01/2023] Open
Abstract
AIMS The endodontic literature reports a lot of comparative study on endodontic instruments, concerning as well their geometry, instrumental dynamics, material, mechanical behavior or heat treatment. However, to our knowledge, no study has focused on the influence of endodontic motors on the shaping abilities of endodontic instruments. Thus, the aim of this study was to analyze the influence of the endodontic motors on root canal shaping instruments. METHOD Dual Move (MICRO-MEGA, Besançon, France), Canal Pro CL2i (COLTENE, Alstätten, Suisse), Canal Pro Jeni Motor (COLTENE, Alstätten, Suisse), Ai Motor (WOODPECKER, Guilin, China), Wave One motor (VDW, Postfach, Munich) and Smart A (WOODPECKER, Guilin, China) were pre-clinically compared in continuous rotation and reciprocating motion on a traction/compression bench using resin blocks. Canal shaping in continuous rotation and reciprocating motion were performed with One Curve and One RECI instruments (MICRO-MEGA, Besançon, France), respectively. The penetration/removal forces, making it possible to objectify the cutting effect and screwing effect of the instruments during root canal shaping, were analyzed. RESULTS The results showed (i) that endodontic motors influence the mechanical behavior of endodontic instruments, (ii) that the influence of the motors is essentially felt during reciprocating motion and (iii) that the reciprocating angles influence the mechanical behavior of endodontic instruments. CONCLUSION Only endodontic instruments are widely studied in literature while endodontic motors have a direct influence on root canal treatment. This study analyzes the influence of the endodontic motors on root canal shaping instruments. This study tends to demonstrate that Jeni Motor could optimize the mechanical behavior of endodontic instruments.
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Affiliation(s)
| | - Renaud Giess
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France
- CNRS, IJL, Université de Lorraine, Nancy, France
| | - Jeanne Davril
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France
| | - Jean-Marc Martrette
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France
- Université de Lorraine, Faculté de Médecine, EA 3450, Développement, Adaptation et Handicap, Nancy, France
| | - Éric Mortier
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France
- CNRS, IJL, Université de Lorraine, Nancy, France
| | - Rémy Balthazard
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France
- CNRS, IJL, Université de Lorraine, Nancy, France
| | - Marin Vincent
- Départment de Dentisterie Restauratrice et Endodontie, Faculté d'odontologie de Lorraine, Université de Lorraine, Nancy, France.
- CNRS, LEM3, Université de Lorraine, Metz, France.
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Chan CW, Romeo VR, Lee A, Zhang C, Neelakantan P, Pedullà E. Accumulated Hard Tissue Debris and Root Canal Shaping Profiles Following Instrumentation with Gentlefile, One Curve, and Reciproc Blue. J Endod 2023; 49:1344-1351. [PMID: 37516238 DOI: 10.1016/j.joen.2023.07.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 07/19/2023] [Accepted: 07/20/2023] [Indexed: 07/31/2023]
Abstract
INTRODUCTION This laboratory study aimed to evaluate the accumulated hard tissue debris (AHTD) and shaping performance following root canal instrumentation with a novel stainless steel rotary system (Gentlefile; MedicNRG, Kibbutz Afikim, Israel) compared with two single-file nickel-titanium instruments of different kinematics through micro-computed tomography (micro-CT) analysis. METHODS Thirty isthmus-containing mesial roots of human mandibular molars with a curvature of 15°-35° were scanned with micro-CT at an isotropic resolution of 12 μm and randomly assigned to three groups (n = 10) according to the instruments used for canal preparation: Gentlefile (GF; #23/.04), One Curve (OC; #25/.06; Micro-Mega, Besancon, France), and Reciproc Blue R25 (RB; #25/.08; VDW, Munich, Germany). The AHTD, unprepared canal surface area, volume changes, surface area changes, and transportation were evaluated by comparing preoperative and postoperative micro-CT images. In addition, the time required for canal preparation was recorded. Data were statistically analyzed using the one-way analysis of variance (ANOVA) test or the Kruskal-Wallis test at a significance level of 5%. RESULTS No significant differences were observed in the percentage of AHTD or in the unprepared canal surface area between the three groups (P > .05). The RB group demonstrated a significantly greater percentage increase in volume and surface area than the GF group (P < .05). The GF and OC groups showed significantly less transportation at 3 mm from the apex than the RB group (P < .001). The OC group required significantly less time for instrumentation than the RB and GF groups (P < .05). CONCLUSIONS Instrumentation with GF (#23/.04), OC, and RB yielded similar levels of AHTD and unprepared surface area in isthmus-containing curved canals. GF achieved this with less dentin removal and apical transportation, at the expense of a longer preparation time.
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Affiliation(s)
- Chi Wai Chan
- Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China
| | - Virginia Rosy Romeo
- Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy
| | - Angeline Lee
- Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China
| | - Chengfei Zhang
- Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China.
| | - Prasanna Neelakantan
- Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China; Department of Endodontics, Arthur A. Dugoni School of Dentistry, University of the Pacific, San Francisco, CA.
| | - Eugenio Pedullà
- Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy
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Wear Analysis of Four Different Single-File Reciprocating Instruments before and after Four Uses in Simulated Root Canals. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12126253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The aim of this study is to assess the surface alterations of four reciprocating instruments before and after the shaping of four resin-simulated root canals. The following four different reciprocating instruments are selected: 10 Reciproc Blue (RB25), 10 WaveOne Gold (WOG), 10 EdgeOne Fire (EOF) and 10 recently introduced instruments OneRECI (OR), for a total of 40 new instruments. Before root canal shaping, each instrument is mounted on a stub in a standardized position and observed using a scanning electron microscope (SEM) to detect any surface alteration, such as microfractures, metal defects, deformations, blunt and disruption of cutting edges, debris, pitting and tip flattening. Micrographs are acquired at the level of the tip, 4 mm, 8 mm and 12 mm from it. After that, each instrument is used in four simulated resin root canals. SEM observation was repeated after the simulated clinical use to assess the wear resistance of the instruments. Surface alterations are registered before and after instrumentation and statistical analysis is performed using a Chi-Square test to verify homogeneity of defects distribution and GLM to evaluate the differences of RMS at baseline and after use for both groups (α level 0.05). Before simulated clinical uses, no alterations are found except for three cases of EOF with metal strips in correspondence to the tip, disruption of the cutting edge of WOG and oily spotting on two different OR. After simulated clinical use, EOF shows a statistically significant difference in terms of spiral distortion and flattening of the cutting edges. The OR shows the highest presence of debris despite the ultrasonic cleaning procedures. No instrument fractures are observed. EOF should be discarded after four clinical uses and carefully inspected after each insertion into root canals. Moreover, tough attention should be paid during disinfection and cleaning procedures after instrumentation considering the copious debris detected in each instrument, particularly in OR.
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Endodontic Rotary Files, What Should an Endodontist Know? Medicina (B Aires) 2022; 58:medicina58060719. [PMID: 35743982 PMCID: PMC9230915 DOI: 10.3390/medicina58060719] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/18/2022] [Accepted: 05/25/2022] [Indexed: 11/17/2022] Open
Abstract
Clinicians should be aware of all the characteristics and capacities of the instruments that are possible to use when conducting a root canal treatment. The wide variety of nickel–titanium (Ni-Ti) rotary systems on the market and the lack of standardisation of this type of instrument makes the choice in each specific case difficult. Therefore, this review is intended to summarize the characteristics that should be taken into account when choosing one instrument over another. It will be essential to know characteristics, of alloy from which the instrument is made. Moreover, the geometry of the instrument will determine its behaviour, being the mass, the one that marks its resistance to a greater extent. The movement performed by the file is another of the fundamental keys to understand rotary instruments. In conclusion, when performing root canal treatment, the characteristics of the instrument and the tooth must be taken into account, and the operator’s own limitations should be known. This paper provides the key points to keep in mind when making this type of treatment.
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Peraça VDO, Xavier SR, de Almeida Gomes F, Dos Santos LGP, Souza EM, Pappen FG. Effect of number of uses and sterilization on the instrumented area and resistance of reciprocating instruments. Restor Dent Endod 2021; 46:e28. [PMID: 34123764 PMCID: PMC8170385 DOI: 10.5395/rde.2021.46.e28] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 11/28/2020] [Accepted: 12/24/2020] [Indexed: 11/11/2022] Open
Abstract
Objectives This study evaluated the effect of repeated uses and autoclaving in the instrumented area, fracture resistance, and time of instrumentation of thermally treated nickel-titanium reciprocating systems. Materials and Methods Two hundred simulated canals were instrumented using Reciproc Blue and WaveOne Gold. Each file was used up to 10 times or until fracture. The instrumented area was measured in pre- and post-operative images, using ImageJ software. Kaplan-Meier survival analysis evaluated the number of uses of instruments before fracture. Instrumented area and time of instrumentation were analyzed by Mann-Whitney U test and Kruskal-Wallis. Correlations among the number of uses and instrumented area were measured. The level of statistical significance was set at p < 0.05. Results Reciproc Blue presented a higher estimated number of uses in comparison with WaveOne Gold (p = 0.026), but autoclaving did not affect the resistance to fracture of instruments (p > 0.05). The instrumented area was different among the evaluated groups (p = 0.039), and the instrumented area along the uses of both tested instruments was reduced. With the time of instrumentation, there was also a significant difference among the evaluated groups; the groups without sterilization cycles were faster, in comparison to those submitted to autoclaving (p = 0.010). Conclusions Reciproc Blue was more resistant than WaveOne Gold, suffering later fracture. Additionally, the sterilization cycles did not influence the estimated number of uses of thermally treated reciprocating instruments, but the instrumented area of root canals was reduced along with the repeated uses of both instruments.
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Affiliation(s)
| | | | | | | | - Erick Miranda Souza
- Department of Endodontics, Federal University of Maranhão, São Luiz, MA, Brazil
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Gavini G, Akisue E, Kawakami DAS, Caldeira CL, Candeiro GTDM, Vivan RR, Calefi PHS, Alcalde MP, Duarte MAH. Optimum glide path motion is safer than continuous rotation of files in glide path preparation. AUST ENDOD J 2021; 47:544-549. [PMID: 33913601 DOI: 10.1111/aej.12519] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 04/01/2021] [Accepted: 04/11/2021] [Indexed: 12/15/2022]
Abstract
This study evaluated the resistance to flexural fatigue and torsional strength of files for glide path preparation in continuous rotation or Optimum Glide Path motion (OGP). ScoutRace 15.02 and ProGlider 16.02 files were used in a dynamic testing device during preparation of simulating curved root canals (40-degree curvature and 5 mm radius). For the torsional test, a machine was used to test torsion measured maximum torsional strength (N.cm). Two-way anova and Tukey's multiple comparisons test were used for statistical analysis. Files in OGP motion had a statistically better resistance to flexural fatigue (P < 0.05). ProGlider files took longer time to failure than ScoutRace files only when OGP was used (P < 0.05). The torsional test revealed that OGP produced significantly less torsional stress than rotary motions for both types of glide path files (P < 0.05) In conclusion, OGP motion increased substantially the mechanical safety of endodontic glide path files.
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Affiliation(s)
- Giulio Gavini
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Eduardo Akisue
- Discipline of Endodontics, Faculty of Dentistry, University Santa Cecília, Santos, Brazil
| | | | - Celso Luiz Caldeira
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, São Paulo, Brazil
| | | | - Rodrigo Ricci Vivan
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, Bauru, Brazil
| | - Pedro Henrique Souza Calefi
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, Bauru, Brazil
| | - Murilo Priori Alcalde
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, Bauru, Brazil
| | - Marco Antonio Húngaro Duarte
- Post Graduation Program in Dentistry, Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, Bauru, Brazil
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14
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Howait M. Reciproc Endodontic File Surface Defects After Single Use: An SEM Analysis. J Int Soc Prev Community Dent 2021; 11:98-103. [PMID: 33688479 PMCID: PMC7934823 DOI: 10.4103/jispcd.jispcd_412_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Revised: 11/30/2020] [Accepted: 12/22/2020] [Indexed: 11/05/2022] Open
Abstract
Objective: The aim of this investigation was to detect defects that may occur to Reciproc endodontic files after a single use. Materials and Methods: A sample of convenience of Reciproc files (VDW GmbH, Munich, Germany) that were used to prepare root canals of anterior or posterior teeth were collected. The files were divided equally into two groups: Group 1 (R25) files were used to prepare mesial root canals of 50 human permanent mandibular molars, and Group 2 (R40) included 50 files that were used to prepare permanent maxillary incisor teeth. Files were analyzed after single use by using a scanning electron microscope at X120 to detect changes in surface morphology. The data were statistically analyzed by using the χ2 test, and statistical significance was set at P < 0.05. Results: A total of 96 Reciproc NiTi files were collected; of those, 67 (70%) were unaffected and 29 (30%) showed overall surface deformations. The types of deformation were blade disruption (22%), surface pitting (12%), and unwinding and tip deformation (1%). No microcracks were detected, and none of the studied files showed fracture. R40 was three times more likely to be deformed and showed blade disruption compared with R25 (P < 0.05). Conclusions: Reciproc rotary NiTi files show high resistance to deformation after a single use. Blade disruption was the most frequent defect occurring in both the small and large files.
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Affiliation(s)
- Mohammed Howait
- Department of Endodontics, Faculty of Dentistry, King Abdul Aziz University, Jeddah, Saudi Arabia
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15
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Moreira EJL, Antunes HDS, Vieira VTL, Cavalcante DM, Oliveira HE, Oliveira DDS, DE-Deus G, Silva EJNLD. Effects of clinical use of NiTi reciprocating instruments on cyclic and torsional resistance, and on roughness. Braz Oral Res 2021; 35:e021. [PMID: 33605352 DOI: 10.1590/1807-3107bor-2021.vol35.0021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 10/08/2020] [Indexed: 11/22/2022] Open
Abstract
The aim of the present study was to evaluate the cyclic fatigue, torsional resistance and surface roughness of Reciproc R25 instruments in four different situations, namely as new instruments and as instruments tested after clinical preparation of one, two or three maxillary molars with four root canals. The total time required to perform each root canal preparation was recorded. Cyclic fatigue resistance was determined by the time to fracture using a customized testing device (n = 10 per group). The torsional test evaluated the torque and angle of rotation to failure according to ISO 3630-1 (n = 10 per group). The roughness of the working parts of new and used instruments was evaluated with a profilometer (n = 5 per group). Statistical analysis was performed using one-way ANOVA and Tukey's test. The level of significance was set at 5%. No fractures or deformations were observed after clinical use. Higher preparation time was needed during the third use of the instruments for all root canals (p < 0.05). There were no significant differences among the groups in regard to either cyclic fatigue or torsional resistance (p > 0.05). Regarding the roughness measurements, groove depth was higher on new and one- versus two- or three-maxillary-molar-prepared instruments (p < 0.05). It can be concluded that the clinical use of Reciproc instruments increased preparation time and decreased surface roughness. However, clinical use did not affect the cyclic fatigue or torsional resistance of the Reciproc instruments.
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Affiliation(s)
- Edson Jorge Lima Moreira
- Universidade Federal Fluminense - UFF, School of Dentistry , Department of Endodontics , Niterói , RJ , Brazil
| | - Henrique Dos Santos Antunes
- Universidade do Grande Rio - Unigranrio, School of Dentistry , Department of Endodontics , Rio de Janeiro , RJ , Brazil
| | - Victor Talarico Leal Vieira
- Universidade do Grande Rio - Unigranrio, School of Dentistry , Department of Endodontics , Rio de Janeiro , RJ , Brazil
| | - Daniele Moreira Cavalcante
- Universidade Federal Fluminense - UFF, School of Dentistry , Department of Endodontics , Niterói , RJ , Brazil
| | - Henrique Eduardo Oliveira
- Universidade Federal Fluminense - UFF, School of Dentistry , Department of Endodontics , Niterói , RJ , Brazil
| | - Diogo da Silva Oliveira
- Universidade Federal Fluminense - UFF, School of Dentistry , Department of Endodontics , Niterói , RJ , Brazil
| | - Gustavo DE-Deus
- Universidade Federal Fluminense - UFF, School of Dentistry , Department of Endodontics , Niterói , RJ , Brazil
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16
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Cyclic Fatigue and Torsional Resistance of Four Martensite-Based Nickel Titanium Reciprocating Instruments. Eur Endod J 2020; 5:231-235. [PMID: 33353907 PMCID: PMC7881387 DOI: 10.14744/eej.2020.16878] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Objective: To evaluate cyclic fatigue and torsional resistance of Reciproc Blue R25 (VDW, Munich, Germany), WaveOne Gold Primary (Dentsply Maillefer, Ballaigues, Switzerland), ProDesign R (Easy Equipamentos Odontológicos, Belo Horizonte, Brazil), and X1 Blue File (MK Life, Porto Alegre, Brazil) nickel titanium (NiTi) martensite reciprocating instruments. Methods: In each group, ten instruments were tested for cyclic fatigue resistance using a stainless-steel artificial canal (curvature angle of 80° and radius of 3 mm) and ten instruments for torsional failure according to ISO 3630-1 standard. The surface of the fractured instruments was examined under scanning electron microscopy (SEM) at ×250 magnification. The results were compared statistically with one-way ANOVA and post hoc Tukey tests and the alpha-type error was set at 5%. Results: X1 blue file and ProDesign Rinstruments showed highest time to fracture than Reciproc Blue and Wave One Gold (P<0.05). However, no differences were found between X1 Blue File and ProDesign R (P>0.05). In addition, Reciproc Blue demonstrated highest time to fracture than WaveOne Gold (P<0.05). The lowest torsional resistance (1.0±0.2 N.cm) and angle of rotation (412º±46) was observed in the ProDesign R group (P<0.05). SEM analyses of fractured surfaces showed a crack initiation area and overload fast fracture zone after cyclic fatigue test, and concentric abrasion marks with microvoids at the centre of rotation after torsional failure experiment. Conclusion: Overall, X1 Blue File and ProDesign R showed higher cyclic fatigue resistance than Reciproc Blue and WaveOne Gold instruments, while ProDesign R had the lowest torsional resistance and angular rotation values to fracture. SEM analysis of all instruments demonstrated typical failures features in both cyclic fatigue and torsional failure tests.
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17
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Iandolo A, Amato A, Martina S, Abdel latif D, Pantaleo G. Management of Severe Curvatures in Root Canal Treatment with the New Generation of Rotating Files Using a Safe and Predictable Protocol. Open Dent J 2020. [DOI: 10.2174/1874210602014010421] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Objective:
The aim of this work was to show the management of severe curvatures done with the new generation of rotating files through a safe and predictable protocol.
Methods:
Three clinical cases were described. A safe protocol was explained using the latest generation of rotating files for the shaping of the anatomy of complex root canals. All the cases presented 90°, 45° curvatures and/or double curvatures.
Results:
The instrumentation of canals increased their surface area and volume. All the cases with 90° and 45° curvatures were optimally shaped.
Conclusion:
With the help of rotating files in the martensitic alloy, it is possible to work safely, while avoiding the risk of file separation, even in root canals with severe curvatures, thus achieving success even in complex clinical cases.
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18
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Spicciarelli V, Marruganti C, Marzocco D, Martignoni M, Ounsi H, Grandini S. Influence of Endodontic Access Cavity Design on Fracture Strength of Maxillary Incisors and Premolars and on Fatigue Resistance of Reciprocating Instruments. FRONTIERS IN DENTAL MEDICINE 2020. [DOI: 10.3389/fdmed.2020.575010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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19
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Bueno CSP, Oliveira DP, Pelegrine RA, Fontana CE, Rocha DGP, Gutmann JL, Bueno CES. Fracture incidence of WaveOne Gold files: a prospective clinical study. Int Endod J 2020; 53:1192-1198. [PMID: 32573799 DOI: 10.1111/iej.13349] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Revised: 06/15/2020] [Accepted: 06/16/2020] [Indexed: 11/28/2022]
Abstract
AIM This prospective clinical study evaluated the incidence of instrument fracture observed after single-file root canal treatment of molars using WaveOne Gold instruments. METHODOLOGY Three standardized, experienced and calibrated specialists treated 750 maxillary and mandibular molars with curvatures less than 45° (2691 root canals) over a 12-month period. All the treatments were performed in a single session. A total of 1104 WaveOne Gold instruments were used, including 38 small, 750 primary, 228 medium and 88 large instruments. Intracanal procedures were performed according to the manufacturer's recommendations, and each instrument was used in a single clinical case. The instruments were examined after their removal from the canal, under an operating microscope at 8× magnification. RESULTS No fractures were observed in any of the 1104 instruments used. CONCLUSIONS No fractures of WaveOne Gold reciprocating instruments occurred during root canal preparations performed in maxillary and mandibular molars with curvatures less than 45° when used strictly according to the manufacturer's recommendations and applied in a single clinical case.
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Affiliation(s)
- C S P Bueno
- Faculdade São Leopoldo Mandic, Endodontia, Instituto de Pesquisas São Leopoldo Mandic, Campinas, SP, Brazil
| | - D P Oliveira
- Faculdade São Leopoldo Mandic, Endodontia, Instituto de Pesquisas São Leopoldo Mandic, Campinas, SP, Brazil
| | - R A Pelegrine
- Faculdade São Leopoldo Mandic, Endodontia, Instituto de Pesquisas São Leopoldo Mandic, Campinas, SP, Brazil
| | - C E Fontana
- Department of Endodontics, School of Dentistry, Pontifical Catholic University of Campinas, Campinas, SP, Brazil
| | - D G P Rocha
- Faculdade São Leopoldo Mandic, Endodontia, Instituto de Pesquisas São Leopoldo Mandic, Campinas, SP, Brazil.,Department of Endodontics, School of Dentistry, Pontifical Catholic University of Campinas, Campinas, SP, Brazil
| | - J L Gutmann
- Department of Endodontics, School of Dentistry, Pontifical Javeriana University, Bogotá, Colombia
| | - C E S Bueno
- Faculdade São Leopoldo Mandic, Endodontia, Instituto de Pesquisas São Leopoldo Mandic, Campinas, SP, Brazil
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20
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Maniglia-Ferreira C, de Almeida Gomes F, Ximenes T, Neto MAT, Arruda TE, Ribamar GG, Herculano LFG. Influence of reuse and cervical preflaring on the fracture strength of reciprocating instruments. Eur J Dent 2019; 11:41-47. [PMID: 28435364 PMCID: PMC5379833 DOI: 10.4103/ejd.ejd_272_16] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Objective: This study sought to assess the influence of cervical preflaring and reuse after resterilization, on fracture strength and plastic deformation and/or surface cracking in reciprocating nickel–titanium [NiTi] endodontic instruments after root canal instrumentation of extracted human teeth. Materials and Methods: Forty engine-driven reciprocating NiTi instruments (20 Reciproc® [RC], VDW; 20 WaveOne® [WO], Dentsply) were used in root canal instrumentation of extracted human molars. A total of 485 human upper molars with similar anatomical features were selected and randomly distributed across four groups according to the instrumentation procedures performed (G1 and G3: RC; G2 and G4: WO). Reciprocating instruments were used as per manufacturer instructions. In groups G3 and G4, cervical preflaring was performed prior to instrumentation. After each use of each instrument, sterilization was repeated and scanning electron microscope (SEM) images were obtained to check for plastic deformations and/or cracks on instrument surfaces. Each instrument was used repeatedly until fracture occurred. Results: Regardless of flaring, RC files exhibited greater fracture strength than WO instruments (P <0.01) with and without preflaring. Cervical preflaring significantly reduced the risk of instrument fracture (P <0.01). No plastic deformations were observed before fracturing. However, cracks were found on WO instruments shortly after their first use. RC and WO instruments resisted fracturing after autoclave sterilization. Conclusions: Cervical preflaring allowed a significant increase in the number of times RC and WO files could be reused safely.
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Affiliation(s)
| | - Fabio de Almeida Gomes
- Department of Endodontics, Course of Dentistry, University of Fortaleza, Fortaleza, CE, Brazil
| | - Tatyana Ximenes
- Department of Endodontics, Course of Dentistry, University of Fortaleza, Fortaleza, CE, Brazil
| | | | - Thiane Elys Arruda
- Department of Endodontics, Course of Dentistry, University of Fortaleza, Fortaleza, CE, Brazil
| | - Giovani Gonçalves Ribamar
- Department of Metallurgical and Materials Engineering, Faculty of Chemical Engineering, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Luis Flávio Gaspar Herculano
- Department of Metallurgical and Materials Engineering, Faculty of Chemical Engineering, Federal University of Ceará, Fortaleza, CE, Brazil
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21
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Hülsmann M, Donnermeyer D, Schäfer E. A critical appraisal of studies on cyclic fatigue resistance of engine-driven endodontic instruments. Int Endod J 2019; 52:1427-1445. [PMID: 31267579 DOI: 10.1111/iej.13182] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 06/30/2019] [Indexed: 11/29/2022]
Abstract
The endodontic literature contains a plethora of studies on static and dynamic cyclic fatigue resistance tests performed on a large array of rotary or reciprocating nickel-titanium endodontic instruments. It was the aim of this review to summarize the currently available evidence to point out the different outcomes from static versus dynamic tests and to assess whether cyclic fatigue tests provide useful data and information for clinical practice. An electronic literature research in the database PubMed was performed using appropriate search terms, and the titles and abstract were screened for relevance. Language was restricted to English. The review reveals marked differences between the results obtained in static and dynamic tests, and also, the results for the same instruments assessed either under static or dynamic experimental conditions are widely inconsistent. Between the lowest and the highest value for one and the same pathfinding instrument was a factor of about 123 when cyclic fatigue was assessed either under static or dynamic experimental conditions. Moreover, standard deviations of up to 30% have been reported. Environmental temperature has a 500% impact on the lifetime of instruments. In conclusion, fatigue resistance tests conducted under room temperature should be regarded as having little meaning and the scientific and clinical benefits of fatigue resistance tests are very limited. These data should be provided by the manufacturer of the instruments.
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Affiliation(s)
- M Hülsmann
- Department of Preventive Dentistry, Periodontology and Cariology, University Medicine Göttingen (UMG), Göttingen, Germany
| | - D Donnermeyer
- Department of Periodontology and Operative, Westphalian Wilhelms-University, Münster, Germany
| | - E Schäfer
- Central Interdisciplinary Ambulance, Westphalian Wilhelms-University, Münster, Germany
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22
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Almeida GC, Guimarães LC, Resende PD, Buono VTL, Peixoto IFC, Viana ACD. Torsional behaviour of Reciproc and Reciproc blue instruments associated with their martensitic transformation temperatures. Int Endod J 2019; 52:1768-1772. [PMID: 31306497 DOI: 10.1111/iej.13185] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 07/09/2019] [Indexed: 11/26/2022]
Abstract
AIM To compare the martensitic transformation temperatures and torsional resistance behaviour of classic M-Wire Reciproc and Reciproc blue files (VDW, Munich, Germany). METHODOLOGY M-Wire classic Reciproc R25 and Reciproc blue R25 instruments were used. Transformation temperatures were determined by differential scanning calorimetry (DSC-DSC 60, Shimadzu, Kyoto, Japan). Three samples with approximately 20 mg of each system were cooled to -120 °C and then heated to 100 °C and then cooled to -100 °C at a rate of 10 °C min-1 . The maximum torque values and angular deflection until fracture of new instruments (n = 10) were measured according to ISO 3630-1. Results were analysed statistically using the Student's t-test at a significance level of P < 0.05. RESULTS DSC results revealed the absence of martensitic transformation for Reciproc instruments in the temperature range analysed. In both systems, the instruments were composed of a mixture of R-phase and austenite at room temperature. After torsional tests, Reciproc blue had significantly lower values for mean maximum torque at rupture (P < 0.05), although the angular deflection values were significantly higher than the Reciproc classic group (P < 0.05). CONCLUSIONS Both Reciproc and Reciproc blue instruments were composed of a mixture of R-phase and austenite. Reciproc Blue instruments had a greater angle of rotation to fracture but a lower torque to failure than M-Wire Reciproc instruments.
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Affiliation(s)
- G C Almeida
- Department of Restorative Dentistry, Faculty of Dentistry
| | - L C Guimarães
- Department of Restorative Dentistry, Faculty of Dentistry
| | - P D Resende
- Department of Metallurgical and Materials Engineering, School of Engineering, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
| | - V T L Buono
- Department of Metallurgical and Materials Engineering, School of Engineering, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil
| | - I F C Peixoto
- Department of Restorative Dentistry, Faculty of Dentistry
| | - A C D Viana
- Department of Restorative Dentistry, Faculty of Dentistry
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23
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Surface nanoscale profile of WaveOne, WaveOne Gold, Reciproc, and Reciproc blue, before and after root canal preparation. Odontology 2019; 107:500-506. [DOI: 10.1007/s10266-019-00424-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 03/19/2019] [Indexed: 10/27/2022]
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24
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Muñoz E, Forner L, Garcet S, Rodríguez-Lozano FJ, Llena C. Canal shaping with a reciprocating system is easy to learn. Int Endod J 2019; 52:1244-1249. [PMID: 30865308 DOI: 10.1111/iej.13111] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Accepted: 03/07/2019] [Indexed: 11/26/2022]
Abstract
AIM To assess progressive learning of root canal shaping in order to define the number of simulated canals in resin blocks needed to reach a level of learning beyond which no further improvement in performance is observed. METHODOLOGY A total of 216 simulated canals in resin blocks were instrumented by 18 operators without experience in Endodontics and by 18 Endodontists. The R25 file of the Reciproc system (VDW, Munich, Germany) was used to prepare the canals. The blocks were photographed before and after instrumentation. An analysis was made of the variations in the dimensions of the canals at 6 locations and of the instrumentation time. A Student's t-test was used to analyse the data (P < 0.05). RESULTS The group without experience were associated with significant differences in instrumentation time between the first canal and the subsequent canals (P < 0.05) but differences in canal dimensions were not significant (P > 0.05). In the group with experience, the instrumentation time did not differ significantly after the fifth canal, and no significant variations in canal dimensions were observed (P > 0.05). CONCLUSIONS When conducting studies on root canal shaping or educating students with new instruments, a simulated canal sample size of 6 was appropriate to achieve competence.
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Affiliation(s)
- E Muñoz
- Department of Stomatology, Clínica Odontológica, Universitat de València, Valencia, Spain
| | - L Forner
- Department of Stomatology, Clínica Odontológica, Universitat de València, Valencia, Spain
| | - S Garcet
- Laboratory for Investigative Dermatology, Rockefeller University, New York, NY, USA
| | - F J Rodríguez-Lozano
- Special Care in Dentistry and Gerodontology, Faculty of Medicine, School of Dentistry, University of Murcia, Murcia, Spain
| | - C Llena
- Department of Stomatology, Clínica Odontológica, Universitat de València, Valencia, Spain
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25
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Generali L, Borghi A, Lusvarghi L, Bolelli G, Veronesi P, Vecchi A, Consolo U, Becce C, Bertoldi C, Sassatelli P. Evaluation of the usage-induced degradation of Genius and Reciproc nickel-titanium reciprocating instruments. Odontology 2019; 107:473-481. [PMID: 30924034 DOI: 10.1007/s10266-019-00423-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Accepted: 01/31/2019] [Indexed: 11/30/2022]
Abstract
The aim of this study was to characterize the main features and the usage-induced degradation of the Genius file after four severely curved root canal instrumentations and to compare their properties to the Reciproc files. Brand new and ex vivo used files were analysed by scanning electron microscopy (SEM) with energy-dispersive X-ray spectrometry (EDS), differential scanning calorimetry (DSC), X-ray diffraction (XRD), optical metallography, and nano-indentation to disclose their morphological, chemical, mechanical, thermal, and phase composition features. Nano-indentation data were statistically analysed using the Student's t test for normal distribution or the Kolmogorov-Smirnov test for not-normal distributions. SEM analysis showed the presence of micro-cracks near the tip on both files after ex vivo usage test. EDS analysis confirmed that both files are manufactured from an almost equiatomic NiTi alloy. DSC analysis revealed that the transition temperature of the Genius is below 20 °C, while that of the Reciproc is above 20 °C. XRD analysis of Genius files identified cubic B2 austenite with minor peaks of residual monoclinic B19 martensite, while the contemporaneous presence of martensite, austenite and hexagonal R-phase was observed in the Reciproc files. Significant differences in nanohardness and modulus of elasticity (P < .05) were observed in both Genius and Reciproc files before and after use. The collected results showed that both instruments can be safely used as single-use files.
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Affiliation(s)
- Luigi Generali
- Department of Surgery, Medicine, Dentistry and Morphological Sciences with Transplant Surgery, Oncology and Regenerative Medicine Relevance (CHIMOMO), University of Modena and Reggio Emilia, Modena, Italy.
| | - Alessia Borghi
- Department of Surgery, Medicine, Dentistry and Morphological Sciences with Transplant Surgery, Oncology and Regenerative Medicine Relevance (CHIMOMO), University of Modena and Reggio Emilia, Modena, Italy
| | - Luca Lusvarghi
- Department of Engineering Enzo Ferrari (DIEF), University of Modena and Reggio Emilia, Modena, Italy
| | - Giovanni Bolelli
- Department of Engineering Enzo Ferrari (DIEF), University of Modena and Reggio Emilia, Modena, Italy
| | - Paolo Veronesi
- Department of Engineering Enzo Ferrari (DIEF), University of Modena and Reggio Emilia, Modena, Italy
| | | | - Ugo Consolo
- Department of Surgery, Medicine, Dentistry and Morphological Sciences with Transplant Surgery, Oncology and Regenerative Medicine Relevance (CHIMOMO), University of Modena and Reggio Emilia, Modena, Italy
| | | | - Carlo Bertoldi
- Department of Surgery, Medicine, Dentistry and Morphological Sciences with Transplant Surgery, Oncology and Regenerative Medicine Relevance (CHIMOMO), University of Modena and Reggio Emilia, Modena, Italy
| | - Paolo Sassatelli
- Department of Engineering Enzo Ferrari (DIEF), University of Modena and Reggio Emilia, Modena, Italy
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26
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Performance of Reciproc Blue R25 Instruments in Shaping the Canal Space without Glide Path. J Endod 2019; 45:194-198. [PMID: 30711177 DOI: 10.1016/j.joen.2018.10.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 10/16/2018] [Accepted: 10/23/2018] [Indexed: 10/27/2022]
Abstract
INTRODUCTION This study assessed the frequency in which Reciproc Blue R25 instruments (VDW, Munich, Germany) reached the full working length (WL) of mandibular molar canals without a glide path. The influence of the type of electric motor (ie, conventional corded or cordless) on the instrument's performance was also assessed. METHODS One hundred mandibular molars with slight to moderate root canals were selected and randomly assigned into 1 of 2 experimental groups according to the type of electric motor used: conventional corded (VDW Silver, VDW) or cordless motors (VDW.CONNECT Drive, VDW). Therefore, 50 molars and 154 root canals were selected for each motor. Reciproc Blue R25 instruments were used until reaching two thirds of the estimated WL. Then, a size 10 K-file was passively inserted to determine the full WL. No active instrumentation movement was performed with a size 10 K-file. Independently, whether a size 10 K-file reached the apex or not, Reciproc Blue R25 instruments were used to complete canal preparation. When the Reciproc Blue R25 instrument was able to reach the full WL, the case was classified as "reaching the full working length" (RFWL). If the instrument was not able to reach the full WL, the case was classified as "not reaching the full working length" (NRFWL). The chi-square test of goodness of fit was used to verify whether the observed frequencies of RFWL and NRFWL adhered to the expected ones. A 5% cutoff level of significance was considered for statistical assumptions. RESULTS Reciproc Blue R25 instruments were able to reach the full WL in 304 root canals (98.70%). The chi-square test revealed the observed frequencies of RFWL and NRFWL to be significantly different from the expected frequencies (χ2 = 292,208, P = .000). The frequency of RFWL and NRFWL was exactly the same for both types of electric motors. No instrument fractured, and a single file deformed. In 50 of 308 root canals, a size 10 K-file was unable to passively reach the full WL. From these 50 canals, Reciproc Blue R25 instruments were able to reach the full WL in 47 of them. CONCLUSIONS Reciproc Blue R25 instruments were able to reach the full WL in a high frequency of cases. The type of electric motor used did not interfere in the frequency of RFWL cases. No instrument fractured, and a single file deformed.
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Sen OG, Bilgin B, Koçak S, Sağlam BC, Koçak MM. Evaluation of Apically Extruded Debris Using Continuous Rotation, Reciprocation, or Adaptive Motion. Braz Dent J 2019; 29:245-248. [PMID: 29972449 DOI: 10.1590/0103-6440201801967] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 03/12/2018] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to compare the amount of apically extruded debris during root canal instrumentation using ProTaper Next (PTN), Twisted File (TF) Adaptive, and Reciproc instruments. Forty-five extracted human maxillary canines were selected and randomly assigned into 3 groups. The root canals were prepared using PTN instruments with continuous rotation (n=15), TF Adaptive instruments with adaptive motion (n=15), Reciproc instruments with reciprocating motion (n=15). During the preparations, canals were irrigated using distilled water and material extruded apically was collected in pre-weighed Eppendorf tubes. After a 5-day drying period in an incubator, the tubes were weighed and the dry weight of the extruded debris was calculated. Data distributions were assessed via the Shapiro-Wilk test, and groups were compared via the Kruskal-Wallis test. The greatest amount of debris extruded by TF Adaptive and the least by PTN, but the difference was insignificant between groups (p=0.259). All instrumentation systems were associated with debris extrusion.
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Affiliation(s)
- Ozgur Genc Sen
- Department of Endodontics, Faculty of Dentistry, Yuzuncu Yil University, Van, Turkey
| | - Burcu Bilgin
- Department of Endodontics, Faculty of Dentistry, Bulent Ecevit University, Zonguldak, Turkey
| | - Sibel Koçak
- Department of Endodontics, Faculty of Dentistry, Bulent Ecevit University, Zonguldak, Turkey
| | - Baran Can Sağlam
- Department of Endodontics, Faculty of Dentistry, Bulent Ecevit University, Zonguldak, Turkey
| | - Mustafa Murat Koçak
- Department of Endodontics, Faculty of Dentistry, Bulent Ecevit University, Zonguldak, Turkey
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Delai D, Jardine AP, Mestieri LB, Boijink D, Fontanella VRC, Grecca FS, Kopper PMP. Efficacy of a thermally treated single file compared with rotary systems in endodontic retreatment of curved canals: a micro-CT study. Clin Oral Investig 2018; 23:1837-1844. [PMID: 30215147 DOI: 10.1007/s00784-018-2624-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 09/06/2018] [Indexed: 11/24/2022]
Abstract
OBJECTIVES This study aimed to compare WaveOne Gold with ProTaper and RaCe systems regarding remaining filling material, apical transportation (AT), and working time (WT) after (i) filling removal and (ii) shaping of curved canals. METHODS Thirty mesiobuccal canals of maxillary molars were prepared and filled. After 30 days, they were randomly assigned into three groups (n = 10), according to the instruments used for filling removal and shaping, respectively: WOG-WaveOne Gold Primary and Medium; PTG-ProTaper Retreatment and ProTaper Next; RCG-D-RaCe and RaCe. Micro-CT analysis assessed the residual filling material and AT. WT was recorded. Data were statistically analyzed (α = .05). RESULTS There was no significant difference between groups in the amount of filling material at any evaluated moment (P > .05). All groups presented low AT values. The WT was similar in all groups in filling removal (P > .05), and in shaping step WOG was faster than PTG and RCG (P < .05). CONCLUSIONS Neither system could completely remove the filling material. The instruments evaluated were safe and the reciprocating system was faster than the rotary systems in shaping the canals. CLINICAL RELEVANCE This study provided consistent information on filling material removal capacity of WaveOne Gold. Considering that all tested systems were safe, WaveOne Gold may be an alternative with cost-effectiveness and shorter learning curve for endodontic retreatment.
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Affiliation(s)
- Débora Delai
- Graduate Program of the School of Dentstry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | | | - Letícia Boldrin Mestieri
- Graduate Program of the School of Dentstry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Daiana Boijink
- Graduate Program of the School of Dentstry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Vania Regina Camargo Fontanella
- Department of Orthopedics and Surgery of the School of Dentstry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Fabiana Soares Grecca
- Graduate Program of the School of Dentstry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Patrícia Maria Poli Kopper
- Graduate Program of the School of Dentstry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
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Caballero-Flores H, Nabeshima CK, Binotto E, Machado MEL. Fracture incidence of instruments from a single-file reciprocating system by students in an endodontic graduate programme: a cross-sectional retrospective study. Int Endod J 2018; 52:13-18. [PMID: 29985528 DOI: 10.1111/iej.12982] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 07/06/2018] [Indexed: 11/29/2022]
Abstract
AIM To assess the fracture incidence of instruments from single-file reciprocating systems when used by students in an endodontic graduate programme. METHODOLOGY Dental records and periapical radiographs of patients treated by students on an endodontic graduate programme using reciprocating systems were assessed. Data on tooth type, number of treated root canals, number of fractured instruments, fragment size, angle, radius, arc length and position of root canal curvature where fractures occurred were tabulated for analysis. The risk of fracture was calculated for each group of teeth, root canal and root thirds, whilst the incidence of fractures reported for the reciprocating systems was compared using the chi-squared test at 5% significance level. RESULTS Overall, 2056 root canals (826 teeth) from 810 patients were included. The incidence of fractured files from single-file reciprocating systems in relation to a number of instrumented canals was 0.92%. Fracture rates of 0.84% and 0.93% were found in 830 and 1226 root canals instrumented with WaveOne and Reciproc systems, respectively. No significant differences were observed between the systems. The highest fracture rate was 52.6% in the mesiobuccal root of mandibular molars. The central angle, radius and arc length of the curvature of root canals where the instruments fractured ranged from 58° to 84°, from 1.7 to 7.2 mm and from 2.4 to 7.6 mm, respectively. CONCLUSION The use of WaveOne and Reciproc single-file reciprocating systems in an endodontic graduate programme was associated with a low incidence of instrument fractures.
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Affiliation(s)
- H Caballero-Flores
- Discipline of Endodontic, Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil
| | - C K Nabeshima
- Discipline of Endodontic, Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil
| | - E Binotto
- Discipline of Endodontic, Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil
| | - M E L Machado
- Discipline of Endodontic, Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil
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Jamleh A, Alfadley A, Alfouzan K. Vertical Force Induced with WaveOne and WaveOne Gold Systems during Canal Shaping. J Endod 2018; 44:1412-1415. [PMID: 30049472 DOI: 10.1016/j.joen.2018.05.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 04/27/2018] [Accepted: 05/14/2018] [Indexed: 11/18/2022]
Abstract
INTRODUCTION The aim of this study was to evaluate the amount of vertical force induced with WaveOne (WO; Dentsply Sirona, York, PA) and WaveOne Gold (WOG, Dentsply Sirona) systems during the canal shaping of extracted teeth. METHODS Thirty canals in 15 maxillary premolars were divided into 2 groups: WO and WOG. The canals were gently shaped with WO/WOG Primary instruments according to the manufacturer's instructions. The vertical forces induced during canal shaping in the apical and coronal directions were recorded. The apically and coronally directed peak forces were used for analysis using the Mann-Whitney U test. The instrumentation time was analyzed using the Student t test. All statistical analyses were performed using SPSS software (Version 22.0; IBM, Armonk, NY) at a 5% significance level. RESULTS The force increased with the successive instrument insertions within each group. The apically and coronally directed peak forces of the WO and WOG groups ranged from 2.89-11.58 N and from 1.53-2.92 N, respectively. In the 3 insertions, WO showed higher peak forces in both directions. For apically directed peak forces, WO had significantly higher peak forces in the first and third insertions than WOG (P < .01). For coronally directed peak forces, WO had significantly higher values in the first and second insertions (P < .05). CONCLUSIONS The WOG system had significantly lower apically and coronally directed peak force values compared with the WO system.
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Affiliation(s)
- Ahmed Jamleh
- Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia; King Abdullah International Medical Research Center, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia.
| | - Abdulmohsen Alfadley
- Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia; King Abdullah International Medical Research Center, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia
| | - Khalid Alfouzan
- Department of Restorative and Prosthetic Dental Sciences, College of Dentistry, King Saud bin Abdulaziz University for Health Sciences, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia; King Abdullah International Medical Research Center, National Guard Health Affairs, Riyadh, Kingdom of Saudi Arabia
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Belladonna FG, Carvalho MS, Cavalcante DM, Fernandes JT, de Carvalho Maciel AC, Oliveira HE, Lopes RT, Silva EJNL, De-Deus G. Micro–computed Tomography Shaping Ability Assessment of the New Blue Thermal Treated Reciproc Instrument. J Endod 2018; 44:1146-1150. [DOI: 10.1016/j.joen.2018.03.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 02/25/2018] [Accepted: 03/09/2018] [Indexed: 11/25/2022]
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Topçuoğlu HS, Demirbuga S, Düzgün S, Topçuoğlu G. Cyclic fatigue resistance of new reciprocating files (Reciproc Blue, WaveOne Gold, and SmartTrack) in two different curved canals. ACTA ACUST UNITED AC 2018; 9:e12344. [PMID: 29863315 DOI: 10.1111/jicd.12344] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 03/31/2018] [Indexed: 11/30/2022]
Abstract
AIM In the present study, we compared the cyclic fatigue resistance (CFR) of Reciproc Blue, WaveOne Gold, and SmartTrack files in curved artificial canals. METHODS Ninety new Reciproc Blue R25, WaveOne Gold Primary, and SmartTrack X1 files were tested in artificial canals with 45° and 60° angles of curvature. CFR was determined by recording the time to fracture in the artificial canals. Two-way analysis of variance was used to analyze the data. RESULTS In the canal with a 45° angle of curvature, no significant differences were observed amongst Reciproc Blue, WaveOne Gold, and SmartTrack (P > .05). In the canal with a 60° angle of curvature, Reciproc Blue and SmartTrack had a greater CFR than WaveOne Gold (P < .05); there was no significant difference between the Reciproc Blue and SmartTrack files (P > .05). CONCLUSION The results of the present study showed that Reciproc Blue and SmartTrack files exhibited greater CFR than WaveOne Gold only in canals with a 60° angle of curvature.
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Affiliation(s)
| | - Sezer Demirbuga
- Department of Restorative Dentistry, Faculty of Dentistry, Erciyes University, Kayseri, Turkey
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Nabavizadeh MR, Sedigh-Shams M, Abdolrasoulnia S. Cyclic Fatigue Life of Two Single File Engine-Driven Systems in Simulated Curved Canals. IRANIAN ENDODONTIC JOURNAL 2018; 13:61-65. [PMID: 29692837 PMCID: PMC5800443 DOI: 10.22037/iej.v13i1.18037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Introduction: This study aimed to evaluate the cyclic fatigue resistance of two single file engine-driven instruments, Reciproc and NeoNiTi, in simulated root canals. Methods and Materials: Two groups of 15 NiTi endodontic instruments with an identical tip size of 0.25 mm were tested: Reciproc R25 (group A) and NeoNiTi A1 (group B). Cyclic fatigue testing was performed in a stainless steel artificial canal. The simulated canals had a 60° angle and 5-mm radius curvature. The Reciproc instruments were operated using the preset program on torque control electric motor specific for the Reciproc instruments, while the NeoNiTi instruments were operated using the manufacturer recommendation. All instruments were rotated until fracture occurred, and the number of cycles to fracture (NCF) and the length of the fractured tip were recorded and registered. Means and standard deviations of NCF and fragment length were calculated for each system and data were subjected to Student’s t test (P<0.05). Results: A statistically significant difference (P<0.05) was noted between Reciproc and NeoNiTi instruments. NeoNiTi A1 instruments were associated with a significantly higher mean NCF as compared to Reciproc R25 instruments (833±176 vs. 318±87 NCF). There was no significant difference (P>0.05) in the mean length of the fractured fragments between the instruments. Conclusion: NeoNiTi instruments were associated with a significantly higher cyclic fatigue resistance than Reciproc instruments.
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Affiliation(s)
- Mohammad Reza Nabavizadeh
- Oral and Dental Disease Research Center, Department of Endodontics, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mahdi Sedigh-Shams
- Department of Endodontics, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Sara Abdolrasoulnia
- Student Research Center Committee, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran
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Topçuoğlu HS, Topçuoğlu G, Kafdağ Ö, Arslan H. Cyclic fatigue resistance of new reciprocating glide path files in 45- and 60-degree curved canals. Int Endod J 2018; 51:1053-1058. [DOI: 10.1111/iej.12915] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 02/21/2018] [Indexed: 11/30/2022]
Affiliation(s)
- H. S. Topçuoğlu
- Department of Endodontics; Faculty of Dentistry; Erciyes University; Kayseri Turkey
| | | | - Ö. Kafdağ
- Department of Endodontics; Faculty of Dentistry; Erciyes University; Kayseri Turkey
| | - H. Arslan
- Department of Endodontics; Faculty of Dentistry; Ataturk University; Erzurum Turkey
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Khasnis SA, Kar PP, Kamal A, Patil JD. Rotary science and its impact on instrument separation: A focused review. J Conserv Dent 2018; 21:116-124. [PMID: 29674810 PMCID: PMC5890398 DOI: 10.4103/jcd.jcd_240_17] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Revised: 11/21/2017] [Accepted: 12/17/2017] [Indexed: 11/04/2022] Open
Abstract
Efficient endodontic treatment demands thorough debridement of the root canal system with minimal procedural errors. The inherent weakness of nickel-titanium alloys is their unexpected breakage. Modifications in the design, manufacturing, thermomechanical and surface treatment of alloys and advancements in movement kinetics have shown to improve the fatigue properties of the alloys, reducing the incidence of separation. This review enlightens the impact of these factors on fatigue properties of the alloy.
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Affiliation(s)
- Sandhya Anand Khasnis
- Department of Conservative Dentistry and Endodontics, PMNM Dental College, Bagalkot, Karnataka, India
| | - Prem Prakash Kar
- Department of Conservative Dentistry and Endodontics, PMNM Dental College, Bagalkot, Karnataka, India
| | - Apoorva Kamal
- Department of Conservative Dentistry and Endodontics, PMNM Dental College, Bagalkot, Karnataka, India
| | - Jayaprakash D. Patil
- Department of Conservative Dentistry and Endodontics, PMNM Dental College, Bagalkot, Karnataka, India
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Yılmaz K, Uslu G, Gündoğar M, Özyürek T, Grande NM, Plotino G. Cyclic fatigue resistances of several nickel-titanium glide path rotary and reciprocating instruments at body temperature. Int Endod J 2018; 51:924-930. [DOI: 10.1111/iej.12901] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Accepted: 01/25/2018] [Indexed: 11/28/2022]
Affiliation(s)
- K. Yılmaz
- Çorum Oral and Dental Centre; Çorum Turkey
| | - G. Uslu
- Private Practice; Dental Clinic; Çanakkale Turkey
| | - M. Gündoğar
- Department of Endodontics; Faculty of Dentistry; Medipol University; İstanbul Turkey
| | - T. Özyürek
- Department of Endodontics; Faculty of Dentistry; Ondokuz Mayıs University; Samsun Turkey
| | - N. M. Grande
- Department of Endodontics; Catholic University of Sacred Heart; Rome Italy
| | - G. Plotino
- Grande Plotino & Torsello - Dental Clinic; Rome Italy
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Silva EJNL, Vieira VTL, Belladonna FG, Zuolo ADS, Antunes HDS, Cavalcante DM, Elias CN, De-Deus G. Cyclic and Torsional Fatigue Resistance of XP-endo Shaper and TRUShape Instruments. J Endod 2018; 44:168-172. [DOI: 10.1016/j.joen.2017.08.033] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 08/10/2017] [Accepted: 08/28/2017] [Indexed: 10/18/2022]
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Evaluation of cyclic fatigue resistance of modern Nickel–Titanium rotary instruments with continuous rotation. GIORNALE ITALIANO DI ENDODONZIA 2017. [DOI: 10.1016/j.gien.2017.09.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Li ML, Liao WL, Cai HX. A micro-computed tomographic evaluation of dentinal microcrack alterations during root canal preparation using single-file Ni-Ti systems. Exp Ther Med 2017; 15:494-499. [PMID: 29387202 PMCID: PMC5769226 DOI: 10.3892/etm.2017.5399] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 10/26/2017] [Indexed: 12/05/2022] Open
Abstract
The aim of the present study was to evaluate the length of dentinal microcracks observed prior to and following root canal preparation with different single-file nickel-titanium (Ni-Ti) systems using micro-computed tomography (micro-CT) analysis. A total of 80 mesial roots of mandibular first molars presenting with type II Vertucci canal configurations were scanned at an isotropic resolution of 7.4 µm. The samples were randomly assigned into four groups (n=20 per group) according to the system used for root canal preparation, including the WaveOne (WO), OneShape (OS), Reciproc (RE) and control groups. A second micro-CT scan was conducted after the root canals were prepared with size 25 instruments. Pre- and postoperative cross-section images of the roots (n=237,760) were then screened to identify the lengths of the microcracks. The results indicated that the microcrack lengths were notably increased following root canal preparation (P<0.05). The alterations in microcrack length in the OS group were more significant compared with those in the WO, RE and control groups (P<0.05). In conclusion, the formation and development of dentinal microcracks may be associated with the movement caused by preparation rather than the taper of the files. Among the single-file Ni-Ti systems, WO and RE were not observed to cause notable microcracks, while the OS system resulted in evident microcracks.
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Affiliation(s)
- Mei-Lin Li
- Department of Oral Medicine, Haizhu Square Branch, Stomatological Hospital, Southern Medical University (Guangdong Provincial Stomatological Hospital), Guangzhou, Guangdong 510280, P.R. China
| | - Wei-Li Liao
- Zhujiang New Town Dental Clinic, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, Guangdong 510060, P.R. China
| | - Hua-Xiong Cai
- Zhujiang New Town Dental Clinic, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, Guangdong 510060, P.R. China
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Topçuoğlu HS, Topçuoğlu G. Cyclic Fatigue Resistance of Reciproc Blue and Reciproc Files in an S-shaped Canal. J Endod 2017; 43:1679-1682. [DOI: 10.1016/j.joen.2017.04.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2017] [Revised: 03/31/2017] [Accepted: 04/10/2017] [Indexed: 11/24/2022]
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Gomes AC, Soares AJ, Souza EM, Zaia AA, Silva EJNL. Intraoperative discomfort associated with the use of a rotary or reciprocating system: a prospective randomized clinical trial. Restor Dent Endod 2017; 42:140-145. [PMID: 28503480 PMCID: PMC5426220 DOI: 10.5395/rde.2017.42.2.140] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 02/20/2017] [Indexed: 11/24/2022] Open
Abstract
Objectives The aim of this randomized, controlled, prospective clinical study was to evaluate patients' intraoperative discomfort during root canal preparations in which either multi-file rotary (Mtwo) or single-file reciprocating (Reciproc) systems were used. Materials and Methods Fifty-five adult patients, aged between 25 and 69 years old, with irreversible pulpitis or pulp necrosis participated in this study. Either the mesiobuccal or the distobuccal canals for maxillary molars and either the mesiobuccal or the mesiolingual canals for mandibular molars were randomly chosen to be instrumented with Mtwo multi-file rotary or Reciproc single-file reciprocating systems. Immediately after each canal instrumentation under anesthesia, patient discomfort was assessed using a 1 - 10 visual analog scale (VAS), ranging from ‘least possible discomfort’ (1) to ‘greatest possible discomfort’ (10). The Wilcoxon signed-rank test was used to determine significant differences at p< 0.05. Results Little intraoperative discomfort was found in all cases. No statistically significant differences in intraoperative discomfort between the 2 systems were found (p = 0.660). Conclusions Root canal preparation with multi-file rotary or single-file reciprocating systems had similar and minimal effects on patients' intraoperative discomfort.
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Affiliation(s)
- Aline Cristine Gomes
- Department of Restorative Dentistry, Campinas State University (UNICAMP) Piracicaba School of Dentistry, Piracicaba, SP, Brazil
| | - Adriana Jesus Soares
- Department of Restorative Dentistry, Campinas State University (UNICAMP) Piracicaba School of Dentistry, Piracicaba, SP, Brazil
| | - Erick M Souza
- Department of Endodontics, Federal University of Maranhão (UFMA), São Luís, MA, Brazil
| | - Alexandre Augusto Zaia
- Department of Restorative Dentistry, Campinas State University (UNICAMP) Piracicaba School of Dentistry, Piracicaba, SP, Brazil
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Topçuoğlu HS, Topçuoğlu G, Düzgün S. Resistance to cyclic fatigue of PathFile, ScoutRaCe and ProGlider glide path files in an S-shaped canal. Int Endod J 2017; 51:509-514. [DOI: 10.1111/iej.12758] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 02/24/2017] [Indexed: 11/30/2022]
Affiliation(s)
- H. S. Topçuoğlu
- Department of Endodontics; Faculty of Dentistry; Erciyes University; Kayseri Turkey
| | - G. Topçuoğlu
- Department of Pedodontics; Faculty of Dentistry; Erciyes University; Kayseri Turkey
| | - S. Düzgün
- Department of Endodontics; Faculty of Dentistry; Erciyes University; Kayseri Turkey
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Bueno CSP, Oliveira DPD, Pelegrine RA, Fontana CE, Rocha DGP, Bueno CEDS. Fracture Incidence of WaveOne and Reciproc Files during Root Canal Preparation of up to 3 Posterior Teeth: A Prospective Clinical Study. J Endod 2017; 43:705-708. [PMID: 28343932 DOI: 10.1016/j.joen.2016.12.024] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Accepted: 12/22/2016] [Indexed: 10/19/2022]
Abstract
INTRODUCTION Reciprocating instruments were developed to improve and simplify the preparation of the root canal system by allowing greater centralization of the canal and requiring a shorter learning curve. Despite the risk of instrument separation, using a reciprocating instrument in more than 1 case is a relatively common clinical practice. The aim of this study was to evaluate the fracture resistance of Reciproc (R25; VDW, Munich, Germany) and WaveOne (Primary; Dentsply Maillefer, Ballaigues, Switzerland) instruments according to the number of uses during the preparation of root canals in up to 3 posterior teeth. METHODS A prospective clinical study was conducted by 3 experienced specialists who performed treatment of 358 posterior teeth (1130 canals) over a period of 12 months using 120 reciprocating instruments, 60 of which were Reciproc R25 and 60 were WaveOne Primary. The motion used during instrumentation followed the recommendations of the respective manufacturers. After each use, the instruments were observed under a dental operating microscope at 8× magnification. In the case of fracture or deformation, the instrument was discarded. RESULTS None of the instruments showed any signs of deformation, but 3 instruments fractured (0.26% of the number of canals and 0.84% of the number of teeth). All fractures occurred in mandibular molars (1 WaveOne Primary file during the third use and 2 Reciproc R25 files, 1 during the first use and the other during the third use). CONCLUSIONS There was a low incidence of fracture when reciprocating files were used in up to 3 cases of endodontic treatment in posterior teeth.
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Affiliation(s)
| | | | - Rina Andrea Pelegrine
- Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
| | - Carlos Eduardo Fontana
- Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
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44
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Blue Thermomechanical Treatment Optimizes Fatigue Resistance and Flexibility of the Reciproc Files. J Endod 2017; 43:462-466. [DOI: 10.1016/j.joen.2016.10.039] [Citation(s) in RCA: 148] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 10/19/2016] [Accepted: 10/24/2016] [Indexed: 01/10/2023]
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45
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Magalhães RRSD, Braga LCM, Pereira ÉSJ, Peixoto IFDC, Buono VTL, Bahia MGDA. The impact of clinical use on the torsional behavior of Reciproc and WaveOne instruments. J Appl Oral Sci 2016; 24:310-6. [PMID: 27556200 PMCID: PMC4990358 DOI: 10.1590/1678-775720150596] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 04/26/2016] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE The aim of this study was to assess the influence of clinical use, in vivo, on the torsional behavior of Reciproc and WaveOne instruments considering the possibility that they degraded with use. MATERIAL AND METHODS Diameter at each millimeter, pitch length, and area at 3 mm from the tip were determined for both types of instruments. Twenty-four instruments, size 25, 0.08 taper, of each system were divided into two groups (n=12 each): Control Group (CG), in which new Reciproc (RC) and WaveOne Primary (WO) instruments were tested in torsion until rupture based on ISO 3630-1; and Experimental Group (EG), in which each new instrument was clinically used to clean and shape the root canals of one molar. After clinical use, the instruments were analyzed using optical and scanning electron microscopy and subsequently tested in torsion until fracture. Data were analyzed using one-way analysis of variance at a=.05. RESULTS WO instruments showed significantly higher mean values of cross-sectional area A3 (P=0.000) and smaller pitch lengths than RC instruments with no statistically significant differences in the diameter at D3 (P=0.521). No significant differences in torsional resistance between the RC and WO new instruments (P=0.134) were found. The clinical use resulted in a tendency of reduction in the maximum torque of the analyzed instruments but no statistically significant difference was observed between them (P=0.327). During the preparation of the root canals, two fractured RC instruments and longitudinal and transversal cracks in RC and WO instruments were observed through SEM analysis. CONCLUSION After clinical use, no statistically significant reduction in the torsional resistance was observed.
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Affiliation(s)
| | - Lígia Carolina Moreira Braga
- - Universidade Federal de Minas Gerais, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Belo Horizonte, MG, Brasil
| | - Érika Sales Joviano Pereira
- - Universidade Federal da Bahia, Faculdade de Odontologia, Departamento de Clínica Odontológica, Salvador, BA, Brasil
| | - Isabella Faria da Cunha Peixoto
- - Universidade Federal de Minas Gerais, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Belo Horizonte, MG, Brasil
| | - Vicente Tadeu Lopes Buono
- - Universidade Federal de Minas Gerais, Faculdade de Engenharia, Departamento de Engenharia Metalúrgica e de Materiais, Belo Horizonte, MG, Brasil
| | - Maria Guiomar de Azevedo Bahia
- - Universidade Federal de Minas Gerais, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Belo Horizonte, MG, Brasil
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46
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Silva EJNL, Villarino LS, Vieira VTL, Accorsi-Mendonça T, Antunes HDS, De-Deus G, Lopes HP. Bending Resistance and Cyclic Fatigue Life of Reciproc, Unicone, and WaveOne Reciprocating Instruments. J Endod 2016; 42:1789-1793. [DOI: 10.1016/j.joen.2016.08.026] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 08/18/2016] [Accepted: 08/29/2016] [Indexed: 10/20/2022]
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Silva EJNL, Rodrigues C, Vieira VTL, Belladonna FG, De-Deus G, Lopes HP. Bending resistance and cyclic fatigue of a new heat-treated reciprocating instrument. SCANNING 2016; 38:837-841. [PMID: 27288112 DOI: 10.1002/sca.21333] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Accepted: 05/27/2016] [Indexed: 06/06/2023]
Abstract
The current study aimed to evaluate the bending resistance and the cyclic fatigue life of a new heat-treated reciprocating instrument (ProDesign R). Untreated ProDesign R, Reciproc R25, and WaveOne Primary instruments were used as reference instruments for comparison. The bending resistance was performed in ten instruments of each system by using a universal testing machine and a proper apparatus. The cyclic fatigue resistance was tested measuring the number of cycles to failure in an artificial stainless steel canal. Scanning electron microscopy analysis was performed to determine the mode of fracture and possible deformations at the helical shaft. Statistical analysis was performed by using parametric methods; one-way analysis of variance plus post hoc pair-wise Tukey test for multiple comparisons (p < 0.05). Untreated ProDesign R presented significantly higher bending resistance than the other tested systems (p < 0.05). No differences were observed between ProDesign R and Reciproc files regarding the bending resistance (p > 0.05). Moreover, ProDesign R revealed a significantly longer cyclic fatigue life (p < 0.05). In contrast, Untreated ProDesign R and WaveOne instruments presented significantly lower cyclic fatigue life than Reciproc (p < 0.05). The new heat-treated reciprocating instrument ProDesign R have higher cyclic fatigue resistance than Untreated ProDesign R, Reciproc, and WaveOne instruments. ProDesign R and Reciproc were significantly more flexible than Untreated ProDesign R and WaveOne files. SCANNING 38:837-841, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
| | - Cristiane Rodrigues
- Department of Endodontics, School of Dentistry-Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil
| | - Victor Talarico Leal Vieira
- Department of Endodontics, School of Dentistry-Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil
| | | | - Gustavo De-Deus
- Department of Endodontics, School of Dentistry-Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil
| | - Hélio Pereira Lopes
- Department of Endodontics, School of Dentistry-Estácio de Sá University (UNESA), Rio de Janeiro, RJ, Brazil
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48
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Silva EJNL, Tinoco JM, Tinoco EMB, Vieira VTL, Sassone LM, Lopes HP. Bending Resistance and Cyclic Fatigue Life of a new Single-File Reciprocating Instrument Waveone Gold. Eur Endod J 2016; 1:1-4. [PMID: 32566901 PMCID: PMC7299058 DOI: 10.5152/eej.2016.16018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 06/23/2016] [Accepted: 08/30/2016] [Indexed: 11/22/2022] Open
Abstract
Objective: The present study aimed to evaluate the bending resistance and cyclic fatigue fracture resistance of a new single-file reciprocating instrument called WaveOne Gold. Reciproc and WaveOne instruments were used as references for comparison. Methods: Sixty 25-mm NiTi instruments (Reciproc R25, WaveOne Primary and WaveOne Gold Primary) were tested. Flexibility was determined by applying 45° bending tests using a universal testing machine (n=10). A custom-made device was used during cyclic fatigue test (n=10), comprising a stainless steel artificial canal measuring 1.4 mm in diameter, 19 mm in total length with an 86° angle and 6 mm radius of curvature. Possible deformations at the helical shaft and mode of fracture were evaluated using scanning electron microscopy analysis. Statistical analysis was performed using one-way analysis of variance. Post hoc pair-wise comparisons were performed using Tukey’s test for multiple comparisons (P<0.05). Results: WaveOne presented significantly higher bending resistance than the other tested systems (P<0.05), whereas Reciproc presented the lowest bending resistance (P<0.05). Reciproc revealed a significantly longer cyclic fatigue fracture resistance than the other systems (P<0.05). Conclusion: Although WaveOne Gold presented higher flexibility than WaveOne, no differences in the resistance to fatigue were observed between both systems. The Reciproc files were more flexible and resistant to fatigue for the angle of curvature of 86° and 6 mm radius than WaveOne and WaveOne Gold files.
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Affiliation(s)
- Emmanuel João Nogueira Leal Silva
- Department of Endodontics, Grande Rio University (UNIGRANRIO) School of Dentistry, Rio de Janeiro, Brazil.,Department of Endodontics, Rio de Janeiro State University (UERJ) School of Dentistry, Rio de Janeiro, Brazil
| | - Justine Monnerat Tinoco
- Department of Endodontics, Rio de Janeiro State University (UERJ) School of Dentistry, Rio de Janeiro, Brazil
| | | | | | - Luciana Moura Sassone
- Department of Endodontics, Rio de Janeiro State University (UERJ) School of Dentistry, Rio de Janeiro, Brazil
| | - Hélio Pereira Lopes
- Department of Endodontics, Estácio de Sá University (UNESA) School of Dentistry, Rio de Janeiro, Brazil
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49
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Ahn SY, Kim HC, Kim E. Kinematic Effects of Nickel-Titanium Instruments with Reciprocating or Continuous Rotation Motion: A Systematic Review of In Vitro Studies. J Endod 2016; 42:1009-17. [DOI: 10.1016/j.joen.2016.04.002] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 03/28/2016] [Accepted: 04/02/2016] [Indexed: 11/26/2022]
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50
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Santa-Rosa J, de Sousa-Neto MD, Versiani MA, Nevares G, Xavier F, Romeiro K, Cassimiro M, Leoni GB, de Menezes RF, Albuquerque D. Shaping Ability of Single-file Systems with Different Movements: A Micro-computed Tomographic Study. IRANIAN ENDODONTIC JOURNAL 2016; 11:228-33. [PMID: 27471537 PMCID: PMC4947850 DOI: 10.7508/iej.2016.03.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 04/20/2016] [Accepted: 03/05/2016] [Indexed: 11/30/2022]
Abstract
Introduction: This study aimed to perform a rigorous sample standardization and also evaluate the preparation of mesiobuccal (MB) root canals of maxillary molars with severe curvatures using two single-file engine-driven systems (WaveOne with reciprocating motion and OneShape with rotary movement), using micro-computed tomography (micro-CT). Methods and Materials: Ten MB roots with single canals were included, uniformly distributed into two groups (n=5). The samples were prepared with a WaveOne or OneShape files. The shaping ability and amount of canal transportation were assessed by a comparison of the pre- and post-instrumentation micro-CT scans. The Kolmogorov-Smirnov and t-tests were used for statistical analysis. The level of significance was set at 0.05. Results: Instrumentation of canals increased their surface area and volume. Canal transportation occurred in coronal, middle and apical thirds and no statistical difference was observed between the two systems (P>0.05). In apical third, significant differences were found between groups in canal roundness (in 3 mm level) and perimeter (in 3 and 4 mm levels) (P<0.05). Conclusion: The WaveOne and One Shape single-file systems were able to shape curved root canals, producing minor changes in the canal curvature.
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Affiliation(s)
- Joedy Santa-Rosa
- Department of Operative Dentistry and Endodontics, Dental College of Pernambuco, University of Pernambuco, Pernambuco, Brazil
| | | | - Marco Aurelio Versiani
- Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, Ribeirão Preto, Brazil
| | - Giselle Nevares
- Department of Operative Dentistry and Endodontics, Dental College of Pernambuco, University of Pernambuco, Pernambuco, Brazil
| | - Felipe Xavier
- Department of Operative Dentistry and Endodontics, Dental College of Pernambuco, University of Pernambuco, Pernambuco, Brazil
| | - Kaline Romeiro
- Department of Operative Dentistry and Endodontics, Dental College of Pernambuco, University of Pernambuco, Pernambuco, Brazil
| | - Marcely Cassimiro
- Department of Operative Dentistry and Endodontics, Dental College of Pernambuco, University of Pernambuco, Pernambuco, Brazil
| | - Graziela Bianchi Leoni
- Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, Ribeirão Preto, Brazil
| | - Rebeca Ferraz de Menezes
- Department of Operative Dentistry and Endodontics, Dental College of Pernambuco, University of Pernambuco, Pernambuco, Brazil
| | - Diana Albuquerque
- Department of Operative Dentistry and Endodontics, Dental College of Pernambuco, University of Pernambuco, Pernambuco, Brazil
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