title: MRI changes in the temporomandibular joint following mandibular setback surgery using sagittal split ramus osteotomy with rigid fixation.
abstract: OBJECTIVE
  This study examined the changes in temporomandibular joint dysfunction (TMD) symptoms and investigated the variations in the disc position, disc and condylar morphology following sagittal split ramus osteotomy (SSRO) with rigid fixation in patients with mandibular prognathism. Furthermore, the authors examined the correlation between mandibular setback and TMD symptoms.
  
  
  METHODS
  The study included 24 Japanese patients with jaw deformities who were treated using bilateral SSRO and Le Fort I osteotomy. The clinical and magnetic resonance imaging findings in the temporomandibular joint were evaluated preoperatively and at three and six months postoperatively.
  
  
  RESULTS
  The preoperative TMD symptoms were significantly associated with the prevalence of TMD symptoms at six months postoperatively. Anterior disc displacement improved in four joints with slight displacement and with no morphological change. There were no postoperative changes in condylar morphology. There was no significant correlation between mandibular setback and the postoperative TMD symptoms.
  
  
  CONCLUSIONS
  Postoperative TMD symptoms may be influenced mainly by preoperative TMD symptoms rather than mandibular setback using SSRO with rigid fixation. Therefore, patients with TMD symptoms require physical examination and MRI for appropriate diagnosis preoperatively.
authors.affiliation: a Department of Oral and Maxillofacial Surgery , Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University , Tokyo , Japan.
authors.forename: Namiaki
authors.initials: N
authors.lastname: Takahara
authors.affiliation: a Department of Oral and Maxillofacial Surgery , Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University , Tokyo , Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Kabasawa
authors.affiliation: b Department of Dentistry and Oral Surgery , Tsuchiura Kyodo General Hospital , Ibaraki , Japan.
authors.forename: Masaru
authors.initials: M
authors.lastname: Sato
authors.affiliation: c Department of Oral and Maxillofacial Radiology , Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University , Tokyo , Japan.
authors.forename: Akemi
authors.initials: A
authors.lastname: Tetsumura
authors.affiliation: c Department of Oral and Maxillofacial Radiology , Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University , Tokyo , Japan.
authors.forename: Tohru
authors.initials: T
authors.lastname: Kurabayashi
authors.affiliation: d Department of Dentistry and Oral Surgery , Tokyo General Hospital , Tokyo , Japan.
authors.forename: Ken
authors.initials: K
authors.lastname: Omura
mesh_terms: D000293:Adolescent; D000328:Adult; D044466:Asian People; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging / Q000601:surgery; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008313:Malocclusion, Angle Class III / Q000150:complications; D008334:Mandible / Q000503:physiopathology* / Q000601:surgery; D008335:Mandibular Condyle / Q000503:physiopathology; D008410:Masticatory Muscles; D008875:Middle Aged; D010027:Osteotomy / Q000379:methods; D059229:Osteotomy, Sagittal Split Ramus / Q000379:methods*; D019224:Temporomandibular Joint Disc / Q000503:physiopathology*; D013705:Temporomandibular Joint Disorders / Q000150:complications / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery; D055815:Young Adult
keywords: Magnetic resonance imaging; Mandibular setback; Sagittal split ramus osteotomy; Temporomandibular joint