深覆[牙合]汉族女性青年微笑特征的计算机测量研究

The computer-assisted measuring study on smile charaeteristics of deep overbite occlusion female adults of Chinese Han-nationality

目的研究深覆(牙合)汉族女性青年的微笑特征,为正畸临床提供参考.方法利用数码相机采集104名18～24岁女性(前牙深覆(牙合)女性42人,个别正常(牙合)女性62人)正面休息位及微笑位照片,利用自行研制开发的分析软件Smile1.0版进行计算机辅助测量分析,得到29项有关微笑特征的测量指标,以个别正常(牙合)组为对照与深覆(牙合)组进行比较.结果深覆(牙合)女性与正常(牙合)女性在微笑时口角宽度、口角宽度变化值及颏点垂直移动距离三项面部软组织特征指标上有显著性差异;在上切牙曲度、最大牙龈暴露值两项反映微笑时唇齿关系的指标上有显著性差异;两组间微笑类型差别不显著.结论姿势性微笑位是研究微笑的标准像位;性别是影响面部软组织特征的主要因素,深覆(牙合)对此影响较小;高位微笑普遍存在于女性群体中;由于深覆(牙合)女性上切牙曲度较大,造成微笑线比例不协调,以及存在露龈微笑,从而导致笑容的不美观.

Objective Objective To study the smile characteristics of deep overbite occlusion female adUlts of Chinese Han-nationality and offer refereces to orthodontic clinical practice. Methods Frontal photographs of faces for 104 female SUbjects（42 deep overbite,62 normal occlusion）aged from 18-24 were taken during rest and smile posture with a digital camera, analysis was performed by a self-developed program Smile 1.0 and 29 item5 about smile characteristics were obtained. The items were compared between the two groups. Results There were no significant differences between groups in mouth width in smile.mouth width change and venical chin movement which belong to the soft tissue features; Significant differences were found in two items about lip-teeth relationship： arc of upper incisors and maximum gingival exposure; Few differences were found in smile types. Conclusion The posed smile is a standard posture for the study of smile characteristics. The facial soft tissue characteristics are influenced mainly by gender, not the deep overbite occlusion. The high smile can be shown among females commonly. The smile of deep overbite occlusion females may be regarded as the unesthetic smile because of the discordance of smile line ratio which is caused by excess of arc of upper incisors and the gingival smile.