Zarif Najafi Hooman, Sabouri Seyed Amir Abbas, Ebrahimi Elham, Torkan Sepideh
Assistant professor, Orthodontic Research Center, Department of Orthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Assistant professor, Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Am J Orthod Dentofacial Orthop. 2016 Jun;149(6):863-70. doi: 10.1016/j.ajodo.2015.11.028.
The aim of this study was to determine the preferred lip position in silhouette profiles with different amounts of divergence.
A normal profile was constructed based on normal values and was altered using software (Photoshop CS, version 8.0; Adobe Systems, San Jose, Calif) to produce a series of 15 profiles in 3 sets (straight, anterior, and posterior divergent). Each set consisted of 5 photographs with different lip positions from -4 mm to +4 mm in 2-mm increments. We asked 240 people in 5 panels (79 senior dental students, 26 orthodontists, 27 maxillofacial surgeons, 27 prosthodontists, and 81 laypeople) to rate the profiles. Mann-Whitney and Kruskal-Wallis tests, and intraclass correlation coefficients were used to analyze the data.
In the anterior and posterior divergent profiles, most groups tended to prefer the original lip positions for both the male and female profiles. In the straight divergent profile, the results were scattered and inconsistent in the different groups. In the posterior divergent profile, the orthodontists and the surgeons selected the 4-mm lip retrusion as the least attractive, and other groups selected the 4-mm lip protrusion as the least attractive. In the anterior and straight divergent profiles, all groups were unanimous in the selection of the 4-mm lip protrusion as the least attractive images. Significant differences were found between the raters in the rankings of some images. No significant difference was found between the male and female raters in the rankings of the profile images.
It is important to establish a normal lip position, especially for a patient with an anterior or a posterior divergent profile. Posterior divergent patients should be treated cautiously so that excessive lip retrusion does not result.
本研究的目的是确定不同发散量的侧面轮廓中唇部的理想位置。
根据正常值构建一个正常轮廓，并使用软件（Photoshop CS，8.0版本；Adobe Systems，加利福尼亚州圣何塞）进行修改，以生成3组共15个轮廓（直线型、前发散型和后发散型）。每组包括5张照片，唇部位置从-4毫米到+4毫米，以2毫米为增量。我们让5个小组的240人（79名高年级牙科学生、26名正畸医生、27名颌面外科医生、27名修复医生和81名普通民众）对这些轮廓进行评分。使用曼-惠特尼检验、克鲁斯卡尔-沃利斯检验和组内相关系数来分析数据。
在前发散型和后发散型轮廓中，大多数小组对男性和女性轮廓都倾向于选择原始的唇部位置。在直线发散型轮廓中，不同小组的结果分散且不一致。在后发散型轮廓中，正畸医生和外科医生选择4毫米唇部后缩作为最不吸引人的，而其他小组选择4毫米唇部前突作为最不吸引人的。在前发散型和直线发散型轮廓中，所有小组都一致选择4毫米唇部前突作为最不吸引人的图像。在某些图像的评分者排名之间发现了显著差异。在轮廓图像评分中，男性和女性评分者之间没有发现显著差异。
确定正常的唇部位置很重要，特别是对于前发散型或后发散型轮廓的患者。后发散型患者应谨慎治疗，以免导致过度的唇部后缩。
