Evaluation of mandibular setback after bilateral sagittal split osteotomy with the hunsuck modification and miniplate fixation.
OBJECTIVE
This study was conducted to evaluate neurosensory disturbances (NSDs) and jaw movement after bilateral sagittal split osteotomy (BSSO) with the Hunsuck modification and miniplate fixation to correct mandibular prognathism.


METHODS
A total of 63 patients who underwent Hunsuck-modified BSSO to correct mandibular prognathism were studied. Both 3-month and 6-month postoperative Schuller's temporomandibular joint (TMJ) views tracing the 63 patients were studied to analyze mandibular movement. The patients' NSD and TMJ symptoms were recorded. Data were analyzed using 1-way analysis of variance.


RESULTS
The mean TMJ was 9.6% with clicking before surgery. At the evaluation 6 months after surgery, the clicking had reduced to 3.1%. The lip neuorsensory deficit increased to 23.8% at 6 months after surgery. The jaw position measurements before and after surgery showed statistically significant differences in mouth opening and jaw advancement (P < .05). The changes in mandibular lateral movement were not statistically significant (P > .05).


CONCLUSIONS
The results of this study show reduced TMJ clicking, the presence of NSDs, and reduced mouth opening after Hunsuck-modified BSSO.
Yang
Xue-Wen
XW
Department of Oral and Maxillofacial Surgery, College of Stomatology, Wuhan University, Wuhan, China.
Long
Xing
X
Yeweng
San-Jie
SJ
Kao
Chia-Tze
CT
D000328:Adult; D001860:Bone Plates; D002508:Cephalometry; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006987:Hypesthesia / Q000209:etiology; D008046:Lip / Q000294:innervation; D008297:Male; D008334:Mandible / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D009068:Movement; D010027:Osteotomy / Q000295:instrumentation / Q000379:methods*; D011183:Postoperative Complications; D011378:Prognathism / Q000601:surgery; D016059:Range of Motion, Articular / Q000502:physiology; D012677:Sensation / Q000502:physiology; D013016:Sound; D013704:Temporomandibular Joint / Q000473:pathology / Q000503:physiopathology