Analysis of cephalometric indices which are consistent with subjective evaluation for facial asymmetry.

本研究旨在探讨颜面不对称的主观评价与头影测量指标之间的关系。10名专家对100名受试者的正面照片进行主观评价，并将其分为三类，即I类，对称视图; II类，不需要处理的轻微不对称;和III类，需要处理的显著不对称。通过对7项指标的比较，明确了各类型的特征。第一类和第二类之间的任何指数均无差异。五项指数显示第三类与其他类别之间的差异。其中，Me到垂直参考线的距离是面部不对称性主观评价的最相关指标。当发现骨骼测量和主观评价之间存在差异时，软组织结构的影响应 ...更多信息 接下来，我们试图确定头影测量指数的阈值，通过该阈值，牙科医生在100名受试者的正面照片上主观区分需要治疗面部不对称的患者（B组）和不需要治疗的患者（A组）。并对这100例受试者的头颅额位片进行了5项指标的分析。对于每一个分类器，通过判别分析确定阈值。随着被判定为需要治疗的受试者数量的增加，头影测量指标的阈值变小，判别准确性降低。在评价的5个指标中，Me的距离（平均值：4.28 mm）或上下颌中线角（平均值：4.31 °），这是与Me相关的指标，在所有观察者中显示出最高的准确性。Me距离和颌骨中线角似乎是面部不对称主观评价最相关的指标，本研究确定的阈值有可能有助于正畸治疗的规划和评估。少

The purpose of this study was to investigate the relationship between the subjective evaluation of facial asymmetry and cephalometric indices. Ten orthodontists subjectively evaluated the frontal photographs of 100 subjects and categorized them into three categories, ie, category I, symmetrical view ; category II, a little asymmetry not requiring treatment ; and category III, marked asymmetry requiring treatment. Seven indices on the frontal cephalographs were obtained and compared between the categories in order to define the characteristics of each category. No differences were found in any of the indices between categories I and II. Five indices showed differences between category III and the other categories. Among them, the distance of Me from the vertical reference line was the most relevant index for the subjective evaluation of facial asymmetry. When a discrepancy is found between skeletal measurements and a subjective evaluation, the influence of soft tissue structures should … More be considered in facial asymmetry.Next, we tried to determine the threshold of cephalometric indices, by which orthodontists subjectively differentiated patients requiring treatment for facial asymmetry (Group B) from those who did not (Group A) on the frontal photographs of 100 subjects. The frontal cephalographs of these 100 subjects were also analyzed for 5 indices. For each orthodontist, the threshold was determined by means of the discriminant analysis. As the number of subjects, who were judged to require treatment, increased, the threshold of cephalometric indices became small and the discriminant accuracy was reduced. Among the 5 indices evaluated, the distance of Me (mean : 4.28 mm) or maxillo-mandibular midline angle (mean : 4.31 degree), which were the indices related to the Me, showed the highest accuracy in all observers. The distance of the Me and the maxillo-mandibular midline angle appeared to be the most relevant indices for subjective evaluation of facial asymmetry and the threshold determined in the present study has the potential to contribute to the planning and evaluation of orthodontic treatments. Less