title: Changes of mandibular movement tracings after the correction of mandibular protrusion by bilateral sagittal split ramus osteotomy.
abstract: OBJECTIVE
  We investigated the effects on mandibular movement tracings after the correction of mandibular protrusion by bilateral sagittal split ramus osteotomy (BSSRO).
  
  
  METHODS
  This study was comprised of 30 control subjects and 14 mandibular protrusion patients. Mandibular movements were recorded during opening, protrusion, and laterotrusion of the jaw with the ARCUSdigma 3-dimensional mandibular kinesiograph (KaVo Dental, Biberach, Germany). The kinematic center and incisor point were used as reference points.
  
  
  RESULTS
  The mandibular movement tracings of patients before the correction of mandibular protrusion by BSSRO were significantly different from those in subjects in the control group, whereas there were no significant differences between the mandibular movement tracings after the correction of mandibular protrusion by BSSRO and those in the control group. Furthermore, the mean biases of the condylar kinematic center in the 3-dimensional directions during the opening, protrusive, and laterotrusive movements of the jaws in the preoperative group were smaller than those in the postoperative group (P < .05), which were similar to those in the control group (P > .05).
  
  
  CONCLUSIONS
  After correction by BSSRO, the mandibular movement tracings in mandibular protrusion patients will be altered to be similar to those in subjects in the control group, which we believe might support the return of mandibular functional movements in treated patients.
authors.affiliation: Resident, Department of Oral and Maxillofacial Surgery, Guanghua School of Stomatology, Stomatological Hospital, Sun Yat-Sen University, Guangzhou, China.
authors.forename: Dahui
authors.initials: D
authors.lastname: Wang
authors.forename: Hongjun
authors.initials: H
authors.lastname: Fu
authors.forename: Rongsheng
authors.initials: R
authors.lastname: Zeng
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Yang
mesh_terms: D000293:Adolescent; D000328:Adult; D002508:Cephalometry; D003481:Cuspid / Q000473:pathology; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000295:instrumentation / Q000379:methods; D007180:Incisor / Q000473:pathology; D008297:Male; D008313:Malocclusion, Angle Class III / Q000601:surgery; D008334:Mandible / Q000473:pathology / Q000503:physiopathology* / Q000601:surgery; D008335:Mandibular Condyle / Q000473:pathology / Q000503:physiopathology; D008437:Maxilla / Q000473:pathology; D008963:Molar / Q000473:pathology; D009068:Movement; D010027:Osteotomy / Q000379:methods*; D011378:Prognathism / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D016059:Range of Motion, Articular / Q000502:physiology; D055815:Young Adult