title: Skeletal stability and condylar position related to fixation method following mandibular setback with bilateral sagittal split ramus osteotomy.
abstract: OBJECTIVE
  To investigate postoperative intersegmental displacement and relapse following bilateral sagittal split ramus osteotomy (BSSRO) by comparing three different fixation methods: group A (sliding plate), group B (miniplate) and group C (bicortical screws).
  
  
  METHODS
  The present retrospective study included 55 patients with mandibular prognathism who were treated with BSSRO. To evaluate skeletal changes, cone-beam computed tomography was taken before surgery (T0), three days after surgery (T1), and 6 months after surgery (T2). Differences among the three groups were assessed using a one-way analysis of variance, where P < 0.05 was accepted as statistically significant.
  
  
  RESULTS
  There were no significant differences among the three groups in demographic data and the amount of mandibular setback. In skeletal changes and condylar axis changes, there were no statistically significant differences among the three groups. However, there were statistically significant postoperative skeletal changes in group C (bicortical screws) at all landmarks. The mean horizontal relapse rate was 1.9% in group A (sliding plate); 4.8% in group B (miniplate); and 15.4% in group C (bicortical screws).
  
  
  CONCLUSIONS
  The sliding plate system has good adaptability to the proximal segment after mandibular setback with BSSRO, and behaves according to semi-rigid fixation principles.
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Yangsan, South Korea.
authors.forename: Young-Chea
authors.initials: YC
authors.lastname: Roh
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Yangsan, South Korea.
authors.forename: Sang-Hun
authors.initials: SH
authors.lastname: Shin
authors.affiliation: Department of Orthodontics, School of Dentistry, Pusan National University, Yangsan, South Korea.
authors.forename: Seong-Sik
authors.initials: SS
authors.lastname: Kim
authors.affiliation: Department of Tissue Engineering, Regea Institute for Regenerative Medicine, University of Tampere, Tampere, Finland; Department of Oral and Maxillofacial Surgery, University of Oulu, Oulu, Finland.
authors.forename: George K
authors.initials: GK
authors.lastname: Sandor
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Yangsan, South Korea; Dental Research Institute, and Institute of Translational Dental Sciences, Pusan National University, Yangsan, South Korea. Electronic address: ydkimdds@pusan.ac.kr.
authors.forename: Yong-Deok
authors.initials: YD
authors.lastname: Kim
mesh_terms: D000328:Adult; D059925:Anatomic Landmarks / Q000473:pathology; D001860:Bone Plates / Q000145:classification*; D001863:Bone Screws; D002508:Cephalometry / Q000379:methods; D054893:Cone-Beam Computed Tomography / Q000379:methods; D004867:Equipment Design; D005146:Facial Asymmetry / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D063172:Genioplasty / Q000379:methods; D006801:Humans; D008297:Male; D008334:Mandible / Q000473:pathology*; D008335:Mandibular Condyle / Q000473:pathology*; D019340:Osteotomy, Le Fort / Q000379:methods; D059229:Osteotomy, Sagittal Split Ramus / Q000295:instrumentation* / Q000379:methods; D011378:Prognathism / Q000601:surgery; D012008:Recurrence; D012189:Retrospective Studies; D014716:Vertical Dimension; D055815:Young Adult
keywords: Cone-beam computed tomography; Mandibular prognathism; Orthognathic; Titanium