One-year rotational relapse frequency following conventional circumferential supracrestal fiberotomy

Table 1 Mean (standard deviation) rotational correction (C°) at T₂ and rotational relapse (R°) and percentage of relapse (R%) at T₃

Arch, n = 19	Tooth, n = 90	C°	R°	R%
Maxillary, n = 11	Total, n = 52	14.6 (2.7)	0.8 (0.2)	8.0
	Canine, n = 17	9.4 (1.5)	0.4 (0.3)	6.1
	Lateral incisor, n = 19	14.9 (2.4)	1.0 (0.2)	10.8
	Central incisor, n = 16	19.8 (1.5)	10.6 (0.5)	7.6
Mandibular, n = 8	Total, n = 38	13.5 (4.2)	1.4 (0.6)	14.0
	Canine, n = 11	12.2 (2.6)	2.9 (0.3)	17.8
	Lateral incisor, n = 13	14.5 (3.2)	0.8 (0.1)	13.9
	Central incisor, n = 14	13.1 (2.4)	1 (0.2)	12.3

Table 2 Overall frequency of relapse at T₃ in tested teeth

Relapse category	Teeth, n = 90	Percent
Unnoticeable relapse, 0°	52	57.8
Barely noticeable relapse, 1°-3°	31	34.5
Noticeable relapse, 4°-9°	6	6.6
Clearly noticeable relapse, ≥ 10°	1	1.1

Table 3 Frequency of relapse by arch, n = 19 arches, n (%)

Category	Total	Maxillary	Mandibular
Unnoticeable relapse, 0°	4 (21.0)	2 (18.2)	2 (25.0)
Barely noticeable relapse, 1°-3°	8 (42.1)	6 (54.5)	2 (25.0)
Noticeable relapse, 4°-9°	6 (31.6)	3 (27.3)	3 (37.5)
Clearly noticeable relapse, ≥ 10°	1 (5.3)	0 (0.0)	1 (12.5)
Total	19 (100.0)	11 (100.0)	8 (100.0)

Table 4 Frequency of relapse by tooth type (n = 90), n (%)

Category	Tooth type
	Maxillary			Mandibular
	Canine	Lateral incisor	Central incisor	Canine	Lateral incisor	Central incisor
Unnoticeable relapse, 0°	12 (70.5)	10 (52.6)	6 (37.5)	6 (54.5)	11 (84.6)	7 (50.0)
Barely noticeable relapse, 1°-3°	5 (29.5 )	7 (36.8)	9 (56.3)	2 (18.2)	1 (7.7)	4 (28.6)
Noticeable relapse, 4°-9°	0 (0.0)	2 (10.5)	1 (6.2)	2 (18.2)	1 (7.7)	3 (21.4)
Clearly noticeable relapse, ≥ 10°	0 (0.0)	0 (0.0)	0 (0.0)	1 (9.1)	0 (0.0)	0 (0.0)
Total	17 (100.0)	19 (100.0)	16 (100.0)	11 (100.0)	13 (100.0)	14 (100.0)
P value	0.132			0.194