对正常者上颌前牙相互间牙冠宽度比例的计算机图像测量分析

Digital Image Measurement and Analysis of Crown Width Ratio between Maxillary Anterior Teeth in Population of Normal Occlusion

目的通过对上颌前牙相互间牙冠宽度比例的研究,为临床前牙美学修复设计提供指导。方法按纳入标准筛选正常青年96人,分别拍摄上颌前牙正面相,并通过德尔菲法评选得到最终13幅照片,测量计算机图像上颌前牙宽度,分析上颌前牙相互间牙冠宽度的比例关系。结果上颌侧切牙与中切牙以及上颌尖牙与侧切牙相互间的宽度比例关系与黄金分割比例关系差别具有统计学意义;上颌侧切牙与中切牙以及上颌尖牙与侧切牙相互间的宽度比例关系与RED比例关系差别具有统计学意义。结论正常青年上颌前牙相互间牙冠宽度未发现黄金分割比例关系及RED比例,但其比例系数有区间集中的趋势。

Objective To provide clinical guidance for aesthetic restoration design of anterior teeth by analyzing crown width ratio between maxillary anterior teeth.Methods 96 young people meeting inclusion criteria were selected in this study.Front images of all maxillary anterior teeth in these people were taken by a digital camera and 13 final photos were chosen by Delphi technique.The width of maxillary anterior teeth in those photos was measured digitally and the width ratio between maxillary anterior teeth was analyzed simultaneously.Results There was significant difference between golden section proportion and width ratio which was calculated by lateral incisor/ central incisor（t=11.959,P0.01）.So was the result between golden section proportion and width ration which was acquired by canine/lateral incisor.The difference also existed between RED and width ratio mentioned above.Conclusion Golden section proportion and RED were not found in crown width ratio between maxillary anterior teeth of young people possessing normal occlusion in this study.However,the width ratio of maxillary anterior teeth presented an interval centralized tendency.