• Andris Abeltins, Gundega Jakobsone, Ilga Urtane, and Andris Bigestans.
• Department of Orthodontics, Riga Stradins University, Dzirciema Street 20, Riga, LV 1007, Latvia. aabeltins@navigator.lv
• J Craniomaxillofac Surg. 2011 Dec 1;39(8):583-7.

IntroductionThe purpose of this retrospective cephalometric study was to compare the stability of bilateral sagittal split osteotomy (BSSO) with extra-oral vertical ramus osteotomy (VRO) after correction of class III malocclusion by means of bimaxillary orthognathic surgery.MethodsThe sample comprised 51 consecutively treated patients, 38 females and 13 males, with a mean age of 19.1 years. All had a one-piece Le Fort I osteotomy with maxillary advancement and mandibular setback. VRO was performed in 30 cases, and BSSO was performed in 21 cases. Lateral cephalograms were obtained before surgery, within 1 week of surgery and 1 year after surgery.ResultsThe mean forward movement of the maxilla was 5.6 mm in both groups (p<0.001). The mean horizontal surgical change in the VRO group was 4.4 mm (p<0.001), and in the BSSO group it was 5.4 mm (p<0.001). In the VRO group, the horizontal relapse was 1.2 mm (p<0.001), and in the BSSO group, it was 1.4 mm (p<0.001).ConclusionThere was no difference in the stability between the BSSO and VRO groups. The average relapse in the whole sample was 26% of the surgical movement.Copyright © 2011 European Association for Cranio-Maxillo-Facial Surgery. Published by Elsevier Ltd. All rights reserved.

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