Does Skeletal Surgery for Asymmetric Mandibular Prognathism Influence the Soft Tissue Contour and Thickness?
Does Skeletal Surgery for Asymmetric Mandibular Prognathism Influence the Soft Tissue Contour and Thickness?
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DOI：
10.1016/j.joms.2013.04.008
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发表时间：
2013-09-01
影响因子：
1.9
通讯作者：
Kwon, Tae-Geon
中科院分区：
文献类型：
--
作者：
Lee, Sung-Tak;Mori, Yoshihide;Kwon, Tae-Geon
用途：本研究的目的是探讨下颌不对称畸形是否伴随着软组织厚度的根本性差异，以及下颌不对称后退手术是否会影响颏部软组织的轮廓和厚度。材料与方法：本回顾性研究包括骨性III类患者，颏点处下颌颏偏斜大于6 mm，在2年的时间内，在术前和术后6个月接受了锥形束计算机断层扫描。预测变量为时间（术前和术后）和侧（不对称vs对侧）。结果指标为使用重新格式化的计算机断层扫描图像评价的下颌牙下、B点和颏点水平的硬组织和软组织轮廓以及软组织厚度。研究变量进行了统计学比较，使用回归模型和相关analysis.Results：本研究包括20例患者（10男，10女，平均年龄20.2岁，范围，18至25）。术前颏偏侧软硬组织轮廓较突出，但软组织厚度较薄，导致硬组织不对称。术后软硬组织轮廓明显改善，软组织厚度几乎对称。软组织厚度变化与硬组织变化大多呈负相关。结论：下颌骨不对称性多颌畸形伴随着三维软组织轮廓和厚度的不对称。由于骨骼手术后软组织反应良好，因此对于不对称性下颌骨多颌畸形的患者，应重视骨三维不对称性的矫正。(C)2013年美国口腔颌面外科医师协会
Purpose: The purpose of the present study was to investigate whether asymmetric mandibular prognathism accompanies a fundamental difference in soft tissue thickness and whether asymmetric mandibular setback surgery would influence the contour and thickness of the soft tissue of the chin.Materials and Methods: The present retrospective study included skeletal class III patients with significant mandibular chin deviation greater than 6 mm at the pogonion, who had undergone cone-beam computed tomography before and 6 months after surgery during a 2-year period. The predictor variables were timing (pre- and postoperatively) and side (asymmetric vs contralateral). The outcome measures were the hard and soft tissue contours and soft tissue thickness of the chin at the infradentale, B-point, and pogonion level evaluated with reformatted computed tomography images. The study variables were statistically compared using regression model and correlation analysis.Results: The present study consisted of 20 patients (10 males and 10 females; average age 20.2 years; range, 18 to 25). Preoperatively, the chin deviation side showed a more prominent hard and soft tissue outline but had a thinner soft tissue thickness, which camouflaged the hard tissue asymmetry. After surgery, the hard and soft tissue outline was greatly improved, and the soft tissue thickness had become nearly symmetric. Most of the soft tissue thickness changes correlated negatively with the hard tissue changes.Conclusions: Asymmetric mandibular prognathism accompanied the 3-dimensional soft tissue contour and thickness asymmetry. Because the soft tissue responds favorably after skeletal surgery, the correction of 3-dimensional asymmetry of bone should be emphasized in patients with asymmetric mandibular prognathism. (C) 2013 American Association of Oral and Maxillofacial Surgeons