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.
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