兰州地区汉族青少年软组织侧貌唇位的评价★

摘要

背景：口腔正畸治疗对面部容貌的改善主要是通过改变患者前牙的唇倾度来使患者的面部软组织侧貌更加协调和美观。目的：研究兰州地区汉族青少年软组织侧貌的唇突度，并且评价非专业人士和正畸医生对青少年不同唇位的面部软组织侧貌的审美观异同。方法：通过描绘兰州地区80名汉族青少年个别正常牙合的头颅侧位片，利用Photoshop8.0软件和头颅测量软件描绘出男女面部软组织侧貌轮廓图。分别以男女面部软组织侧貌的唇位前突或后缩1 mm为单位设计出以所描绘出的面部软组织侧貌轮廓图居中的13个面部软组织侧貌轮廓图，由50名非专业人士和50名正畸医生从建立的一系列男女面部软组织侧貌轮廓图中挑选出3种最喜欢的面部侧貌并按喜好排序同时选出最不受欢迎的面部侧貌。结果与结论：兰州地区汉族男性面部软组织侧貌的唇突度相对于Sn-Pg’线而言上唇为(7.50±1.72) mm，下唇为(5.86±1.83) mm。汉族女性面部软组织侧貌的唇突度相对于 Sn-Pg’线而言上唇为(6.23±1.73) mm，下唇为(4.94±2.03) mm。而男性面部侧貌最受欢迎的唇突度相对于Sn-Pg’线而言，非专业人士认为上唇为3.5-5.5 mm，下唇为1.9-3.9 mm；正畸医生则认为上唇为5.5-7.5 mm，下唇为3.9-5.9 mm。女性面部侧貌最受欢迎的唇突度相对于Sn-Pg’线而言，非专业人士认为上唇2.2-4.2 mm，下唇为0.9-2.9 mm；正畸医生则认为上唇为4.2-6.2 mm，下唇为2.9-4.9 mm。说明非专业人士和正畸医生均喜欢唇位略微后缩的面部软组织侧貌，但二者差异有显著性意义(P <0.05)，非专业人士喜欢唇位更后缩的面部侧貌，而唇部前突的面部侧貌是最不受欢迎的面部侧貌。%BACKGROUND: Orthodontic treatment for facial appearance changes is mainly realized by improving the patient’s lip inclination of the anterior teeth to make the patient’s soft tissue profile more coordinating and beautiful. OBJECTIVE: To study lip protrusion in Han adolescent in Lanzhou region of soft tissue profile and assess esthetic differences between laypersons and orthodontists on the soft tissue profile of adolescents in different lip positions. METHODS: A facial silhouette of the male and female soft tissue profile was constructed using Photoshop8.0 via soft tissue profile analysis from cephalometric radiographs of individual normal occlusions in 80 Han adolescents from Lanzhou region. Thirteen facial silhouettes of soft tissue profile were developed by 1 mm lip protrusion or retrusion as unit. Fifty laypersons and fifty orthodontists were asked to select the three most-favored soft tissue profiles for each sex from a series of facial silhouettes with varying anteroposterior lip positions, rank them in order of preference and select the least-favored profile for each sex. RESULTS AND CONCLUSION: The lip protrusion values in Lanzhou area of Han male soft tissue profile relative to Sn-Pg’ line were (7.50±1.72) mm for the upper lip and (5.86±1.83) mm for the lower lip. The lip protrusion values of female soft tissue profile relative to Sn-Pg’ were (6.23±1.73) mm for the upper lip and (4.94±2.03) mm for the lower lip. The most-favored lip protrusion relative to Sn-Pg’ line rated by the laypersons for male was 3.5-5.5 mm for the upper lip and 1.9-3.9 mm for the lower lip, which rated by the orthodontists was 5.5-7.5 mm for the upper lip and 3.9-5.9 mm for the lower lip. The most-favored lip protrusion relative to Sn-Pg’ line rated by the laypersons for female was 2.2-4.2 mm for the upper lip and 0.9-2.9 mm for the lower lip, which rated by the orthodontists was 4.2-6.2 mm for the upper lip and 2.9-4.9 mm for the lower lip. Both the laypersons and the orthodontists preferred a soft tissue profile with slightly retruded lip position. But the laypersons favored a more retruded lip position for female and male, there were significant differences between the laypersons’ and the orthodontists’ preference (P < 0.05). The laypersons preferred a soft tissue profile with more retruded lip position. The least-favored soft tissue profile was the most protrusive.