title: Change in condylar long axis and skeletal stability following sagittal split ramus osteotomy and intraoral vertical ramus osteotomy for mandibular prognathia.
abstract: OBJECTIVE
  The purpose of this study was to compare postsurgical time course changes in condylar long axis and skeletal stability between sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO).
  
  
  METHODS
  Of 40 Japanese patients with a diagnosed jaw deformity, 20 underwent IVRO without internal fixation and 20 underwent SSRO with rigid internal fixation. The time course change in condylar long axis and skeletal stability were assessed with axial, frontal, and lateral cephalograms.
  
  
  RESULTS
  A significant difference in the rotation direction of condylar long axis was seen in horizontal axial cephalogram images (P <.01). In Pog-N perpendicular to SN, the IVRO group showed gradual decrease, although SSRO group showed gradual increase in lateral cephalogram (P <.05).
  
  
  CONCLUSIONS
  The present results suggest a significant difference between SSRO and IVRO in time course changes in proximal segment including condyle and distal segment.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, 13-1 Takaramachi, Kanazawa 920-8641, Japan. kueki@med.kanazawa-u.ac.jp
authors.forename: Koichiro
authors.initials: K
authors.lastname: Ueki
authors.forename: Kohei
authors.initials: K
authors.lastname: Marukawa
authors.forename: Mayumi
authors.initials: M
authors.lastname: Shimada
authors.forename: Kiyomasa
authors.initials: K
authors.lastname: Nakagawa
authors.forename: Etsuhide
authors.initials: E
authors.lastname: Yamamoto
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D002508:Cephalometry; D006801:Humans; D007569:Jaw Abnormalities / Q000601:surgery; D019248:Jaw Fixation Techniques / Q000295:instrumentation; D008313:Malocclusion, Angle Class III / Q000601:surgery; D008334:Mandible / Q000002:abnormalities* / Q000601:surgery*; D008335:Mandibular Condyle / Q000000981:diagnostic imaging / Q000473:pathology*; D019647:Oral Surgical Procedures / Q000009:adverse effects / Q000379:methods*; D010027:Osteotomy / Q000009:adverse effects / Q000379:methods; D011378:Prognathism / Q000601:surgery*; D011859:Radiography; D012008:Recurrence; D018709:Statistics, Nonparametric; D013705:Temporomandibular Joint Disorders / Q000209:etiology