微笑线的影响因素和临床意义

Affective factors and clinical appl ication of smile line

目的探讨影响三类微笑的颅、颌、面、牙-牙槽的形态及相互位置关系。为正畸、正颌外科、修复的临床动态检查、诊断、制定治疗计划、预测和评价治疗效果提供新的定量参考依据。方法以80名17～25岁普通颜貌、个别正常牙合大学生(男40名、女40名)为研究对象,采用X线头影测量、正位定位摄影等方法对松弛唇位时口唇部作测量分析,并在此基础上对影响最大开唇微笑的口唇部软硬组织进行计算机辅助方差分析。结果在三类微笑中腭平面角、上下牙-牙槽高度、上中切牙临床牙冠高度、上唇长度、唇间隙、上中切牙显露量、上唇红唇垂直向厚度以及口角宽度在统计学上差异有显著意义,而其它测量指标差异均无显著意义。结论在正畸、正颌外科及修复临床中应检查患者治疗前的微笑类型,分析上述测量指标对治疗结果的影响程度,以确定合理的治疗计划。

Objective To discuss the morphology and relative location of cranium,jaw,face,te eth-alveolus which affecting three types of smile,so as to provide a quantitative guideline for the clinical dynamic investigation,diagnosis,treatment planning,prognosis and appraisal i n the practice of orthodontics,orth ognathia and prosthetics.Methods Eighty students(40male and 40female,age range:17～25)with acceptable faces and individual normal occlusion were included.Me asurement including sagittal cephalometric f ilm and frontal fixed position photo graphic computer-aided analysis we re adopted to study the mouth-lip region at relaxed positio n.Based on these data a computer-aid ed analysis of variance was carried o ut on the soft and hard tissues in the lip-mouth region whic h affected maximum smile position.Results Among the three types of smile,facto rs showing statistical significance include:PP-SN angle;upper or lower alveolus height;upper central incisor clini cal crown length;upper lip length;interlabial gap;upper cent ral incisor exposure;upper lip red z one vertical thickness;and mouth co rner width.Other measured factors have no significan ce.Conclusions It is necessary to investigate the sm ile types before treatment in the cli nical practice of orthodontics,orthognathia and prosthetics.It is helpful t o consider these factors before maki ng an ideal treatment plan.[