title: Condylar and disc positions after sagittal split ramus osteotomy with and without Le Fort I osteotomy.
abstract: OBJECTIVE
  The purpose of this study is to examine the changes in temporomandibular joint (TMJ) morphology and clinical symptoms after sagittal split ramus osteotomy (SSRO) with and without a Le Fort I osteotomy.
  
  
  METHODS
  Of 45 Japanese patients with mandibular prognathism, 23 underwent SSRO and 22 underwent SSRO in combination with a Le Fort I osteotomy. The TMJ symptoms and joint morphology, including disc tissue, were assessed preoperatively and postoperatively by magnetic resonance imaging (MRI) and axial cephalography.
  
  
  RESULTS
  There were significant differences between pre- and postoperative horizontal changes in the condylar long axis on the right side in the group undergoing SSRO (sagittal split ramus osteotomy) alone. However, there were no other significant differences in pre- and postoperative measurements in this group as compared with the group receiving SSRO plus Le Fort I osteotomy, and the preoperative disc position could not be changed in either group.
  
  
  CONCLUSIONS
  These results suggest that SSRO, either with or without Le Fort I osteotomy, could not change the preoperative disc position or correct anterior disc displacement, although these procedures did improve the symptoms associated with TMJ dysfunction.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan. kueki@med.kanazawa-u.ac.jp <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: Yukari
authors.initials: Y
authors.lastname: Hashiba
authors.forename: Kiyomasa
authors.initials: K
authors.lastname: Nakgawa
authors.forename: Etsuhide
authors.initials: E
authors.lastname: Yamamoto
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D004204:Joint Dislocations / Q000145:classification / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D008313:Malocclusion, Angle Class III / Q000150:complications / Q000601:surgery; D008334:Mandible / Q000601:surgery*; D008335:Mandibular Condyle / Q000000981:diagnostic imaging / Q000473:pathology*; D019647:Oral Surgical Procedures; D019340:Osteotomy, Le Fort; D018709:Statistics, Nonparametric; D019224:Temporomandibular Joint Disc / Q000000981:diagnostic imaging / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000150:complications / Q000601:surgery*; D036542:Tomography, Spiral Computed; D016896:Treatment Outcome