title: Changes in occlusal force after mandibular ramus osteotomy with and without Le Fort I osteotomy.
abstract: The purpose of this study was to evaluate the differences in bite force changes and occlusal contacts after sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO) with and without Le Fort I osteotomy. Sixty female patients with diagnosed mandibular prognathism with or without asymmetry were divided into four groups (SSRO, IVRO, SSRO with Le Fort I osteotomy and IVRO with Le Fort I osteotomy). Bite force and occlusal contacts were measured preoperatively and at 1, 3, 6 and 12 months after surgery with pressure-sensitive sheets. The differences among surgical procedures were examined statistically. Maximum bite force and occlusal contacts returned to preoperative levels after between 3 and 6 months. Regarding time-dependent changes in bite force and occlusal contact area, there were no significant differences among the groups. In conclusion, this study suggests that the combination of IVRO or SSRO and Le Fort I osteotomy does not affect postoperative time-dependent changes.
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: K
authors.initials: K
authors.lastname: Ueki
authors.forename: K
authors.initials: K
authors.lastname: Marukawa
authors.forename: M
authors.initials: M
authors.lastname: Shimada
authors.forename: K
authors.initials: K
authors.lastname: Nakagawa
authors.forename: E
authors.initials: E
authors.lastname: Yamamoto
mesh_terms: D000293:Adolescent; D000328:Adult; D001732:Bite Force; D001860:Bone Plates; D001863:Bone Screws; D003766:Dental Occlusion; D005146:Facial Asymmetry / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007574:Jaw Relation Record / Q000295:instrumentation; D008334:Mandible / Q000503:physiopathology / Q000601:surgery*; D008437:Maxilla / Q000503:physiopathology / Q000601:surgery; D010027:Osteotomy / Q000295:instrumentation / Q000379:methods*; D019340:Osteotomy, Le Fort / Q000379:methods*; D011378:Prognathism / Q000601:surgery; D012189:Retrospective Studies; D013997:Time Factors