Skeletodental factors affecting chin point deviation in female patients with class III malocclusion and facial asymmetry: a three-dimensional analysis using computed tomography.
OBJECTIVE
Three-dimensional computed tomography (CT) was used to investigate which skeletodental factors are related to chin point deviation of facial asymmetry in skeletal class III malocclusion (SCIII) patients.


METHODS
Forty Korean adult female patients with SCIII, who had a three-dimensional CT taken 1 month before orthognathic surgical surgery, were assigned to group 1 (symmetry) or group 2 (asymmetry) according to the amount of chin point deviation from facial midline. Midfacial, mandibular, and cranial base variables were measured with software and statistically analyzed.


RESULTS
Group 2 showed higher positions of the upper canine and first molar, shorter ramus height, more superior-posterior positioning of gonion (Go) on the deviated side, and more mesial inclination of the ramus and medial positioning of Go on the opposite side.


CONCLUSIONS
Facial asymmetry in SCIII patients occurs due to greater growth and mesial inclination of the ramus and greater maxillary vertical excess in the opposite side.
Baek
Seung-Hak
SH
Department of Orthodontics, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea.
Cho
Il-Sik
IS
Chang
Young-Il
YI
Kim
Myung-Jin
MJ
D000328:Adult; D016022:Case-Control Studies; D002508:Cephalometry / Q000379:methods; D002680:Chin / Q000000981:diagnostic imaging*; D005146:Facial Asymmetry / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008313:Malocclusion, Angle Class III / Q000000981:diagnostic imaging*; D008334:Mandible / Q000000981:diagnostic imaging; D018709:Statistics, Nonparametric; D014057:Tomography, X-Ray Computed / Q000379:methods*