不同错类型人群微笑特征的研究

A study on the smile characteristics of the subjects with different types of malocclusion

目的：研究不同错[牙合]类型人群的微笑特征。方法：选取18～25岁青年180人，其中安氏Ⅰ类、Ⅱ类和Ⅲ类各60人，采集其动态微笑视频，从中获取姿势性微笑图像，使用计算机软件对该图像进行定量评估。结果：3组的各测量指标中，安氏Ⅱ类[牙合]的微笑指数和牙龈暴露量的性别差异有统计学意义（P ＜0．05）；除微笑对称率外，其他定量评估指标的组间差异均有统计学意义（P ＜0．05）。颊旁间隙、牙龈暴露量由大到小依次为：Ⅱ类＞Ⅰ类＞Ⅲ类，Ⅲ类[牙合]微笑指数大于Ⅰ类和Ⅱ类，微笑时Ⅱ类[牙合]的牙齿暴露量小于Ⅰ类和Ⅲ类。结论：不同错[牙合]类型人群的微笑特征不同。

Objective：To compare the smile characteristics of the subjects with different types of malocclusion.Methods：1 80 sub-jects with classⅠ（n =60）,classⅡ（n =60）and class Ⅲ（n =60）malocclusion at the age of 1 8 to 25 years were included.The smile vidioes and posed smile images of the subjects were acquired.Smile quantitative evaluation indexes were measured and analysed.Re-sults：There were statistical differences in smile indexes and the amount of the gingival exposure in classⅡ subjects between the male and female（P 〈0.05）.There were statistical differences in the quantitative evaluation indexes except the smile symmetry rate among the three groups（P 〈0.05）.The buccal corridor and the gingival exposure ordered from larger to smaller：class Ⅱ 〉classⅠ 〉classⅢ,smile index of class Ⅲ was greater than that of class Ⅰ and class Ⅱ,the teeth exposure of class Ⅱ was less than that of class Ⅰand class Ⅲ.Conclusion：Malocclusion types may affect smile characteristics.