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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.
AuthorsK Ueki, K Marukawa, A Moroi, M Sotobori, Y Ishihara, R Iguchi, A Kosaka, Y Nakano, M Higuchi, R Nakazawa
JournalInternational journal of oral and maxillofacial surgery (Int J Oral Maxillofac Surg) Vol. 43 Issue 2 Pg. 213-6 (Feb 2014) ISSN: 1399-0020 [Electronic] Denmark
PMID23953770 (Publication Type: Comparative Study, Journal Article)
CopyrightCopyright © 2013 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.
Topics
  • Adult
  • Female
  • Humans
  • Male
  • Malocclusion, Angle Class III (physiopathology, surgery)
  • Mandible (physiopathology, surgery)
  • Movement (physiology)
  • Orthognathic Surgical Procedures
  • Osteotomy, Sagittal Split Ramus
  • Treatment Outcome

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