Resident in Orthodontics, Section of Orthodontics, Federal University of Bahia, Dental School, Salvador, Bahia, Brazil.
Associate Professor, Section of Orthodontics, Federal University of Bahia, Dental School, Salvador, Bahia, Brazil.
J Esthet Restor Dent. 2017 Jul 8;29(4):291-297. doi: 10.1111/jerd.12305. Epub 2017 May 27.
Determine orthodontists and laypersons' perception of maxillary central and lateral incisor edge asymmetries in full-face and close-up smiles.
Four smile photos were selected for this study: two full-face and two close-up smile photos of two male subjects, a white man and an Afro-descendant man. Both were considered pleasant smiles, following some principles of an ideal smile. Images were digitally altered to create tooth wear asymmetries on the maxillary left central and lateral incisor in 0.5 mm increments. Final images were arranged randomly into a photo album and were shown to 86 judges (43 orthodontists and 43 laypersons). Judges were asked to evaluate the attractiveness of the images according to a visual analog scale. Data were statistically analyzed using one-way analysis of variance (ANOVA) with the Tukey's post hoc test and the Student t test.
There was no statistically significant difference in the mean esthetic scores of the full-face and close-up smile photos. The most attractive smiles were those without asymmetries and those with 0.5 mm wear in the lateral incisor, whereas the least attractive ones were those with 1.0-1.5 mm wear in the central incisors. Statistically significant difference was found in the mean scores given by the judges in most cases. The orthodontists were more critical and assigned lower scores than the laypersons.
The presence of maxillary incisor asymmetries is a critical factor influencing the perception of smile esthetics. The most attractive smiles of the men investigated were those without asymmetry and those with 0.5 mm incisor edge asymmetry in the lateral incisor.
The presence of incisal asymmetries (especially in maxillary central incisors) negatively influences smile esthetics, corroborating the clinical hypothesis that the closer to the facial midline, the greater the need for symmetry.
确定正畸医生和非专业人士对上颌中切牙和侧切牙边缘不对称在全脸微笑和特写微笑中的感知。
本研究选择了四张微笑照片：两名男性受试者的两张全脸微笑照片和两张特写微笑照片，他们都被认为是令人愉悦的微笑，遵循了理想微笑的一些原则。通过数字方式改变图像，在上颌左侧中切牙和侧切牙上创建 0.5 毫米增量的牙齿磨损不对称。最终的图像被随机排列在一个相册中，并展示给 86 名裁判（43 名正畸医生和 43 名非专业人士）。裁判根据视觉模拟评分法对图像的吸引力进行评估。使用单因素方差分析（ANOVA）对数据进行统计分析，并使用 Tukey 事后检验和学生 t 检验。
全脸微笑照片和特写微笑照片的平均美观评分没有统计学差异。最吸引人的微笑是没有不对称的微笑和侧切牙有 0.5 毫米磨损的微笑，而最不吸引人的微笑是中切牙有 1.0-1.5 毫米磨损的微笑。在大多数情况下，裁判给出的平均分数存在统计学差异。正畸医生比非专业人士更挑剔，给出的分数更低。
上颌切牙不对称的存在是影响微笑美观感知的一个关键因素。在所研究的男性中，最吸引人的微笑是没有不对称的微笑和侧切牙有 0.5 毫米切牙边缘不对称的微笑。
切牙不对称的存在（特别是在上颌中切牙）会对微笑美观产生负面影响，这与临床假设一致，即越接近面部中线，对称性的需求就越大。
