Orthodontic retreatment of an adult woman with mandibular backward positioning and temporomandibular joint disorder: A case report

Table 1 Cephalometric analysis

Measurement	Normal	Pretreatment	Posttreatment
SNA°	81.7 ± 2.5	82.4	82.2
SNB°	78.9 ± 2.2	79.5	79.9
ANB°	2.8 ± 1.2	2.9	2.3
SN-MP°	32.9 ± 4.2	34.8	34.2
U1-L1°	123.2 ± 6.2	136.8	129.2
U1-SN°	105.1 ± 6.2	82.8	101.3
U1-NA°	23.3 ± 6.2	15.8	17.6
L1-NB°	27.4 ± 4.7	28.1	26.0
IMPA (L1-MP)°	95.4 ± 4.7	93.0	91.5
UL-EP (mm)	-0.5 ± 1.9	-2.5	-1.7
LL-EP (mm)	1.3 ± 1.9	-2.2	-1.1

S: Sella; N: Nasion; A: A-point; B: B-point; SN: Sella-nasion plane; MP: Mandibular plane; U1: Upper incisor; L1: Lower incisor; IMPA: Incisor mandibular plane angle; EP: Esthetic plane; UL: Upper lip; LL: Lower lip.

Table 2 Joint space measurements

	Right temporomandibular joint			Left temporomandibular joint
	Anterior JS (mm)	Posterior JS (mm)	JSI	Anterior JS (mm)	Posterior JS (mm)	JSI
Pretreatment	3.57	1.11	-52.6	2.75	1.22	-38.5
Retention for 22 mo	3.28	1.30	-43.2	-	-	-
Relative change (re-pre)	-0.29	0.19	9.4	-	-	-

Re: Retention; pre, pretreatment; JS: Joint space; JSI: Joint space index.