Disk position and temporomandibular joint structure associated with mandibular setback in mandibular asymmetry patients.
OBJECTIVE
To determine the changes in articular disk position and the temporomandibular joint (TMJ) structure in patients who had an asymmetric setback of the mandible performed by a bilateral sagittal split ramus osteotomy with manual positioning of the condyle.


METHODS
Twenty-two patients with skeletal Class III malocclusion being treated at Nara Medical University Hospital were evaluated using clinical examination and pre- and postoperative magnetic resonance images of their TMJs.


RESULTS
Changes in articular disk position after asymmetric setback surgery were not statistically significant, although a tendency of anterior displacement in the fossa was noted. The anterior and posterior joint spaces did not show significant changes, whereas the condyle head of the deviated or contralateral side tended to be positioned downward.


CONCLUSIONS
The asymmetric setback of the mandible with intraoperative manual positioning of the condyle does not significantly change the disk position in the fossa.
Department of Oral and Maxillofacial Surgery, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8521, Japan. mkawaka@naramed-u.ac.jp
Masayoshi
M
Kawakami
Kazuhiko
K
Yamamoto
Tomohiro
T
Inoue
Atsuhisa
A
Kajihara
Masaki
M
Fujimoto
Tadaaki
T
Kirita
D000293:Adolescent; D000328:Adult; D002508:Cephalometry; D005146:Facial Asymmetry / Q000601:surgery*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008313:Malocclusion, Angle Class III / Q000601:surgery; D008334:Mandible / Q000601:surgery*; D008335:Mandibular Condyle / Q000473:pathology; D008336:Mandibular Diseases / Q000601:surgery*; D010027:Osteotomy / Q000379:methods; D011183:Postoperative Complications; D013704:Temporomandibular Joint / Q000473:pathology*; D019224:Temporomandibular Joint Disc / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000209:etiology; D055815:Young Adult