title: Changes in border movement of the mandible in skeletal Class III before and after orthognathic surgery.
abstract: The purpose of this study was to examine the changes in border movement of the mandible before and after mandibular ramus osteotomy in patients with prognathism. The subjects were 73 patients with mandibular prognathism who underwent sagittal split ramus osteotomy (SSRO) with and without Le Fort I osteotomy. Border movement of the mandible was recorded with a mandibular movement measure system (K7) preoperatively and at 6 months postoperatively. Of the 73 patients, 21 had measurements taken at 1.5 years postoperative. Data were compared between the pre- and postoperative states, and the differences analyzed statistically. There was no significant difference between SSRO alone and SSRO with Le Fort I osteotomy in the time-course change. The values at 6 months postoperative were significantly lower than the preoperative values for maximum vertical opening (P=0.0066), maximum antero-posterior movement from the centric occlusion (P=0.0425), and centric occlusion to maximum opening (P=0.0300). However, there were no significant differences between the preoperative and 1.5 years postoperative measurements. This study suggests that a postoperative temporary reduction in the border movement of the mandible could recover by 1.5 years postoperative, and the additional procedure of a Le Fort I osteotomy does not affect the recovery of mandibular motion after SSRO.
authors: Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan. Electronic address: kueki@yamanashi.ac.jp.
authors: K
authors: K
authors: Ueki
authors: Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan.
authors: K
authors: K
authors: Marukawa
authors: Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan.
authors: A
authors: A
authors: Moroi
authors: Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan.
authors: M
authors: M
authors: Sotobori
authors: Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan.
authors: Y
authors: Y
authors: Ishihara
authors: Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan.
authors: R
authors: R
authors: Iguchi
authors: Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan.
authors: A
authors: A
authors: Kosaka
authors: Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan.
authors: Y
authors: Y
authors: Nakano
authors: Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan.
authors: M
authors: M
authors: Higuchi
authors: Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan.
authors: R
authors: R
authors: Nakazawa
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008313:Malocclusion, Angle Class III / Q000503:physiopathology* / Q000601:surgery*; D008334:Mandible / Q000503:physiopathology* / Q000601:surgery*; D009068:Movement / Q000502:physiology; D056948:Orthognathic Surgical Procedures; D059229:Osteotomy, Sagittal Split Ramus; D016896:Treatment Outcome
keywords: Le Fort I osteotomy; border movement of the mandible; orthognathic surgery; sagittal split ramus osteotomy