Relapse of skeletal class III with anterior open bite after bimaxillary orthognathic surgery depending on maxillary posterior impaction and mandibular counterclockwise rotation.

Abstract

The goal of this study is to evaluate relapse after orthognathic surgery of skeletal class III with anterior open bite depending on the posterior impaction and mandibular counterclockwise rotation. Patients (n = 29) were divided into two groups according to the change of mandibular occlusal plane angle (MnOP): Group A had a clockwise change of MnOP > 0° (n = 11) and Group B had a counterclockwise change of MnOP < -2° (n = 18). Lateral cephalograms were analyzed preoperatively, and at immediate stage, six weeks, six months, and one year after surgery. One year after surgery, the stability of the maxilla was good in both groups. Upward movement of the mandible was observed six weeks after surgery due to mandibular autorotation. The amount of mean relapse was small, although a significant difference was observed horizontally between groups. Group B demonstrated more forward movement of B point, pogonion, and menton than Group A (p < 0.05). SNB angle increased in both groups (p < 0.05). At one year follow up, good occlusal stability was observed in both groups with positive overbite. Our study suggested that bimaxillary procedures with clockwise and counterclockwise rotation of mandibular occlusal planes for correction of mandibular prognathism with anterior open bite appeared to be relatively stable procedures.

• Authors: Hok Sim Kor, Hoon Joo Yang, Soon Jung Hwang
• Journal: Journal of cranio-maxillo-facial surgery : official publication of the European Association for Cranio-Maxillo-Facial Surgery (J Craniomaxillofac Surg) Vol. 42 Issue 5 Pg. e230-8 (Jul 2014) ISSN: 1878-4119 [Electronic] Scotland
• PMID: 24954529 (Publication Type: Comparative Study, Journal Article)
• Copyright: Copyright © 2013 European Association for Cranio-Maxillo-Facial Surgery. Published by Elsevier Ltd. All rights reserved.

Topics

• Bone Plates
• Cephalometry (methods)
• Chin (pathology)
• Female
• Follow-Up Studies
• Genioplasty (methods)
• Humans
• Jaw Fixation Techniques (instrumentation)
• Male
• Malocclusion, Angle Class III (surgery)
• Mandible (pathology, surgery)
• Maxilla (pathology, surgery)
• Open Bite (surgery)
• Orthognathic Surgical Procedures (methods)
• Osteotomy, Le Fort (methods)
• Osteotomy, Sagittal Split Ramus (methods)
• Prognathism (surgery)
• Recurrence
• Rotation
• Vertical Dimension
• Young Adult