title: Position of mandibular canal and ramus morphology before and after sagittal split ramus osteotomy.
abstract: OBJECTIVE
  The purpose of this study was to evaluate changes in the mandibular canal and ramus morphology before and after a sagittal split ramus osteotomy.
  
  
  METHODS
  The subjects were 30 patients (60 sides) with mandibular prognathism who had undergone bilateral sagittal split ramus osteotomy setback surgery. The mandibular canal position and ramus morphology were measured at the 3 horizontal planes under the mandibular foramen level (level A), 1 cm lower than level A (level B), and 2 cm lower than level A (level C) preoperatively and 1 year postoperatively by computed tomography.
  
  
  RESULTS
  Postoperative ramus width, lateral distance, lateral marrow distance, and canal length were significantly larger than the preoperative values at the foramen, 1 cm lower, and 2 cm lower. The mandibular canal completely contacted the lateral cortex without lateral bone marrow in 6 sides (10%) in levels A and B and 4 sides (6.7%) in level C preoperatively and 6 sides (10%) in level C postoperatively.
  
  
  CONCLUSIONS
  This study suggested that postoperative mandibular canal position was located more posteriorly and the postoperative lateral bone marrow became thicker compared with the preoperative state.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan. kueki@med.kanazawa-u.ac.jp
authors.forename: Koichiro
authors.initials: K
authors.lastname: Ueki
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Okabe
authors.forename: Mao
authors.initials: M
authors.lastname: Miyazaki
authors.forename: Aya
authors.initials: A
authors.lastname: Mukozawa
authors.forename: Kohei
authors.initials: K
authors.lastname: Marukawa
authors.forename: Kiyomasa
authors.initials: K
authors.lastname: Nakagawa
authors.forename: Etsuhide
authors.initials: E
authors.lastname: Yamamoto
mesh_terms: D000293:Adolescent; D000328:Adult; D001853:Bone Marrow / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D019248:Jaw Fixation Techniques / Q000295:instrumentation; D008297:Male; D008334:Mandible / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000601:surgery*; D008340:Mandibular Nerve / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D056948:Orthognathic Surgical Procedures; D010027:Osteotomy; D011184:Postoperative Period; D057234:Preoperative Period; D014057:Tomography, X-Ray Computed; D055815:Young Adult