Department of Maxillofacial Diagnostic and Surgical Sciences, Division of Oral and Maxillofacial Surgery, Graduate School of Dental Science, Kyushu University, Fukuoka.
Department of Dentistry and Oral Surgery, Division of Medicine for Function and Morphology of Sensory Organs, Faculty of Medicine, Osaka Medical and Pharmaceutical University, Osaka.
J Craniofac Surg. 2022;33(1):e92-e97. doi: 10.1097/SCS.0000000000008228.
This study aimed to evaluate the performance of geometric morphometry (GM) to assess the changes in facial soft tissue after orthognathic surgery. Subjects were 27 patients (skeletal class III) who underwent bilateral sagittal split ramus osteotomy and 27 volunteers as a control group. Computed tomography images of each patient were obtained before surgery (T0) and 6 months after surgery (T1). Computed tomography images of 27 volunteers (skeletal class I) were also obtained as a control group. Using a three-dimensional (3D) modeling software, 3D models were created and exported to a 3D surface analyzing software for geometric morphometry and principal component (PC) analysis. Significant differences in facial soft tissue were found in the first and second of 15 PC. The first PC represented variation in the lower facial height, and the second PC represented variation in the anterior-posterior position of the chin. Comparing the pre- and post-operative images, they illustrated that lower facial height was decreased, and the chin and lower lip moved posteriorly. Geometric morphometry showed to be a successful tool to isolate surgery-related changes from interindividual morphological variations.
本研究旨在评估几何形态测量学（GM）在评估正颌手术后面部软组织变化中的性能。研究对象为 27 名（骨骼类 III 型）接受双侧矢状劈开截骨术的患者和 27 名志愿者作为对照组。每位患者的计算机断层扫描（CT）图像在术前（T0）和术后 6 个月（T1）获得。27 名志愿者（骨骼类 I 型）的 CT 图像也作为对照组获得。使用三维（3D）建模软件创建 3D 模型，并将其导出到 3D 表面分析软件进行几何形态测量和主成分（PC）分析。在 15 个 PC 中的第一和第二个中发现面部软组织存在显著差异。第一 PC 代表下面部高度的变化，第二 PC 代表颏部的前后位置变化。比较术前和术后图像，表明下面部高度降低，颏部和下唇向后移动。几何形态测量学被证明是一种成功的工具，可以将与手术相关的变化与个体间的形态变化隔离开来。
