正常牙合人群口周软组织增龄性变化的研究

目的:探讨正常牙合人群口周软组织在休息位与微笑位时随年龄变化特征。方法:选择15~49岁个别正常牙合者240例,进行面像拍摄,应用Smile Measure软件测量其口周软组织。结果:各年龄组间进行两两比较,组间差异有意义的测量项目有休息位上唇长度、微笑位上唇长度、休息位上唇厚度、微笑位上唇厚度、休息位口角宽度、口角宽度变化量、上颌切牙暴露量、上下唇间隙、微笑指数、颊旁间隙(P＜0.05)。同一年龄组不同性别进行两样本t检验,差异有意义的测量项目有休息位上唇长度、微笑位上唇长度、上唇长度变化量、休息位口角宽度(P＜0.05)。微笑高度进行卡方检验, G1、G2、G3、G4组高中低位微笑类型男女性别差异均具有统计学意义(P＜0.05)。结论:随年龄增长,上唇长度变长,嘴唇变薄,微笑时口角变宽,颊旁间隙变大,更趋于低位微笑。相同年龄人群的唇齿关系具有性别差异。

Study on the Perioral Soft Tissue Changes with Age for Normal Occlusion Subjects.

Objective: To investigate the changes of the perioral soft tissue in subjects at rest position and posed smile. Methods: 240 subjects with normal occlusion at the age of 15-49 were selected. The images were recorded and the perioral soft tissue were measured with the software of Smile Measure. Results: The analysis of pairwise comparison showed there were significant differences in the upper lip length at rest, upper lip length at smile, upper lip thickness at rest, upper lip thickness at smile, intercommissural width at rest, change in intercommissural width, maxillary incisal display, interlabial gap, smile index, and buccal corridors between each two groups. The analysis of two-sample t test showed there were significant differences in upper lip length at rest, upper lip length at smile, change in upper lip length, intercommissural width at rest between the male and female in the same group. The analysis of chisquare test showed there were significant differences between the smile height of male and female in G1,G2,G3,G4. Conclusion: With age increasing, upper lip length increased, the lip became more thinner, intercommissural became more wider and buccal corridors became more larger, and smile tended to be low smile. There were gender differences in lips and teeth relationship of subjects at the same age.