Changes in mandibular angle and intergonial width after bilateral sagittal split ramus osteotomy or bimaxillary surgery with/without counterclockwise rotation.

D Bi, H Gao, M Q H Al-Watary, X Sun, Q Zhao, J Li
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Abstract

The aim of this retrospective study was to evaluate the morphological changes in the mandibular angle area after orthognathic surgery with or without mandibular counterclockwise rotation in Class II deformity patients, and to investigate the associated factors. Computed tomography scans obtained preoperatively (T0), within 1 month postoperatively (T1), and 6 months postoperatively (T2) were collected from 58 patients who underwent either bilateral sagittal split ramus osteotomy (group I), bimaxillary surgery with mandibular counterclockwise rotation (group II), or bimaxillary surgery without mandibular counterclockwise rotation (group III). The intergonial width increased after surgery, by 2.78 ± 2.02 mm in group I, 2.86 ± 2.81 mm in group II, and 2.53 ± 2.42 mm in group III (all P < 0.001). The mandibular angle (MA) increased in group I (ΔMA 4.76 ± 2.79°; P < 0.001) and group III (ΔMA 3.50 ± 2.58°; P < 0.001); however no significant increase was observed in group II. The increase in intergonial width was positively correlated with the lateral displacement of the proximal segment. Counterclockwise rotation of the proximal segment resulted in an increase in MA, while counterclockwise rotation resulted in a reduction in this increasing trend. The results indicate that reducing the displacement and rotation of the proximal segments is key to minimizing changes in the mandibular angle area.

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双侧矢状劈裂颌骨截骨术或双颌手术后下颌角和颌间宽的变化(有/无逆时针旋转)。
这项回顾性研究旨在评估 II 类畸形患者在接受或未接受下颌逆时针旋转正颌手术后下颌角区域的形态变化,并研究相关因素。研究收集了 58 名患者术前(T0)、术后 1 个月内(T1)和术后 6 个月内(T2)的计算机断层扫描结果,这些患者分别接受了双侧矢状劈裂颌骨截骨术(I 组)、下颌骨逆时针旋转双颌手术(II 组)或下颌骨逆时针旋转双颌手术(III 组)。术后颌间宽度增加,I组为(2.78 ± 2.02)毫米,II组为(2.86 ± 2.81)毫米,III组为(2.53 ± 2.42)毫米(均为P<0.05)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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