title: Assessment of the relationship between the recovery of maximum mandibular opening and the maxillomandibular fixation period after orthognathic surgery.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the differences in the recovery of maximum mandibular opening (MMO), and the relationship between MMO and the maxillomandibular fixation (MMF) period after sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO), with and without Le Fort I osteotomy.
  
  
  METHODS
  Sixty-eight patients with diagnosed mandibular prognathism with or without asymmetry were divided into 4 groups (SSRO, IVRO, SSRO with Le Fort I osteotomy, and IVRO with Le Fort I osteotomy). MMO and the MMF period were measured preoperatively and at 1, 3, 6, 12, and 18 months after surgery. The differences among surgical procedures and the relationship between MMO and the MMF period were examined statistically.
  
  
  RESULTS
  In relation to time-dependent changes in MMO, there were no significant differences among the groups. There were significant positive correlations between MMO and the MMF period from 1 month to 6 months after surgery. However, there were no significant correlations at 12 and 18 months after surgery.
  
  
  CONCLUSIONS
  This study suggests that there were no significant differences between single-jaw surgery and double-jaw surgery in terms of postoperative time-dependent changes in the recovery of MMO. However, the MMF period was associated with the recovery of MMO.
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: Kohei
authors.initials: K
authors.lastname: Marukawa
authors.forename: Yukari
authors.initials: Y
authors.lastname: Hashiba
authors.forename: Kiyomasa
authors.initials: K
authors.lastname: Nakagawa
authors.forename: Kagan
authors.initials: K
authors.lastname: Degerliyurt
authors.forename: Etsuhide
authors.initials: E
authors.lastname: Yamamoto
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D005260:Female; D006801:Humans; D016268:Internal Fixators; D019248:Jaw Fixation Techniques / Q000295:instrumentation; D008297:Male; D008334:Mandible / Q000503:physiopathology* / Q000601:surgery; D008437:Maxilla / Q000503:physiopathology* / Q000601:surgery; D010027:Osteotomy / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods*; D019340:Osteotomy, Le Fort / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods; D011378:Prognathism / Q000601:surgery*; D016059:Range of Motion, Articular / Q000502:physiology; D020127:Recovery of Function / Q000502:physiology; D012044:Regression Analysis; D012189:Retrospective Studies; D013704:Temporomandibular Joint / Q000503:physiopathology; D013997:Time Factors; D016896:Treatment Outcome; D014716:Vertical Dimension