title: Stability After Bilateral Sagittal Split Osteotomy With Rigid Internal Fixation in Surgery-First Approach.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the stability of bilateral sagittal split ramus osteotomy (BSSO) setback with rigid internal fixation in a surgery-first approach (SFA) for patients with skeletal Class III malocclusion.
  
  
  METHODS
  Twenty-seven consecutive patients with skeletal Class III malocclusion treated with BSSO with the SFA were included in the study. Lateral cephalograms were taken and traced before surgery and 1 and 6 months after surgery. Cephalometric measurements were compared using repeated-measures analysis of variance. A P value less than or equal to .05 was considered significant.
  
  
  RESULTS
  The study included 9 men (age, 25.7 ± 2.9 yr) and 18 women (age, 26.6 ± 4.2 yr). Treatment time was 8.4 ± 1.5 months. Horizontally, there were no meaningful anteroposterior changes of the pogonion and B point during the postsurgical period (0.9 and 0.6 mm, respectively). Vertically, the pogonion showed superior movement after surgery (2.4 mm) without major postsurgical change (0.6 mm). The B point showed major superior movement after surgery (2.3 mm) and during the postsurgical period (1.2 mm). The inclination of the lower incisor was increased labially during the postsurgical period (2.4°), although this was not statistically important.
  
  
  CONCLUSIONS
  In the present study, there was no major horizontal relapse for any variable (<1 mm). Vertically, all variables showed no meaningful changes during the postsurgical period except the B point showed 1.2 mm of superior displacement. BSSO with rigid fixation using the SFA seems to be an effective and predictable procedure in patients with skeletal Class III malocclusion.
authors.affiliation: Former Graduate Student, Department of Oral and Maxillofacial Surgery, Catholic University of Korea, Seoul, Korea.
authors.forename: Young-Wook
authors.initials: YW
authors.lastname: Kwon
authors.affiliation: Research Assistant Professor, Graduate School, Catholic University of Korea, Seoul, Korea; Visiting Professor, Department of Postgraduate Studies, Universidad Autónoma del Paraguay, Asunción, Paraguay.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Bayome
authors.affiliation: Professor, Department of Oral and Maxillofacial Surgery, Seoul St Mary's Hospital, Catholic University of Korea, Seoul, Korea. Electronic address: jupark@catholic.ac.kr.
authors.forename: Je Uk
authors.initials: JU
authors.lastname: Park
mesh_terms: D000328:Adult; D001863:Bone Screws; D002508:Cephalometry / Q000379:methods; D002680:Chin / Q000473:pathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000473:pathology; D016268:Internal Fixators; D019248:Jaw Fixation Techniques; D008046:Lip / Q000473:pathology; D008297:Male; D008313:Malocclusion, Angle Class III / Q000601:surgery* / Q000628:therapy; D008334:Mandible / Q000473:pathology; D059229:Osteotomy, Sagittal Split Ramus / Q000295:instrumentation / Q000379:methods*; D010347:Patient Care Planning; D012189:Retrospective Studies; D016896:Treatment Outcome; D014716:Vertical Dimension; D055815:Young Adult