Ehmer U, Wegener A
Abteilung Kieferorthopädie, Zentrum für Zahn-, Mund- und Kieferheilkunde, Münster.
Fortschr Kieferorthop. 1993 Jun;54(3):134-42. doi: 10.1007/BF02409023.
The aim of the study presented here was to evaluate the efficacy of symmetry indices when using a specially adapted computer aided mandibular analysis of symmetry degree (CMS). By means of using a series of anteroposterior cephalograms with experimentally simulated rotations and tippings of the two mandibles under study (one ideal symmetric, one severe asymmetric), it proved possible to quantify significant distortions in the degree of symmetry. It was possible to demonstrate that the determination of percentual symmetry degree is a helpful diagnostic tool in the case of skeletal mandibular asymmetry. In the two-dimensional projections of posteroanterior cephalograms, however, computer aided differential analysis of the functional and skeletal components of asymmetry were not shown to be valid. This finding can thus be generally applied to all exclusively posteroanterior cephalogram related symmetry indices.
本研究的目的是评估在使用经过特殊调整的计算机辅助下颌骨对称度分析（CMS）时对称指数的功效。通过使用一系列前后位头影测量片，对所研究的两个下颌骨（一个理想对称，一个严重不对称）进行实验模拟旋转和倾斜，结果证明可以量化对称度的显著变形。可以证明，在骨骼性下颌骨不对称的情况下，确定百分比对称度是一种有用的诊断工具。然而，在正位头影测量片的二维投影中，计算机辅助的不对称功能和骨骼成分差异分析并未显示有效。因此，这一发现通常可应用于所有仅与正位头影测量片相关的对称指数。
