State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China.
Department of Implant Dentistry, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
BMC Oral Health. 2021 Jan 22;21(1):42. doi: 10.1186/s12903-021-01402-9.
The maxillary anterior teeth play a crucial role in smile aesthetics. Previous studies regarding the importance of maxillary lateral incisors for smile aesthetics concentrated on their size, incisor edge level, and inclination, etc. However, the aesthetic effect of lateral incisor movement in the spatial position has not been studied yet. Therefore, the purpose of this study was to explore the influence of the labiolingual position of maxillary lateral incisors on the aesthetic perception of smiles by orthodontists and laypersons, as well as analyze differences in this perception between male and female raters.
A three-dimensional (3D) dental model was generated from the photograph of a man's smile using iOrtho7.0 software (Time Angel, Wuxi, China). Based on this model, seven images were generated with different labiolingual positions of the maxillary lateral incisors in 0.5 mm increments (+ indicating labial translation, and-indicating lingual translation). The images were evaluated by 86 orthodontists and 161 laypersons using a visual analog scale, with lower scores indicating less attractiveness. Data were analyzed using Student's t test and one-way analysis of variance with post hoc test.
There was no significant difference in smile ratings by males and females. Orthodontists assigned lower scores to all images than laypersons. The smile at + 1.5 mm was considered the least attractive by orthodontists, while smiles at + 1.5 mm and - 1.5 mm were regarded as the least attractive by laypersons. The smile at 0 mm was evaluated as the most attractive by all raters. Laypersons gave different scores to smiles at 0 or - 0.5 mm, but orthodontists did not.
The labiolingual position of maxillary lateral incisors does affect the perception of smile aesthetics. Orthodontists may rate smile aesthetics more critically than laypersons. Therefore, communication and discussion between orthodontists and patients is needed to achieve better therapeutic and aesthetic outcomes.
上颌前牙在微笑美学中起着至关重要的作用。以前关于上颌侧切牙在微笑美学中的重要性的研究集中在其大小、切缘水平和倾斜度等方面。然而，上颌侧切牙在空间位置上的运动的美学效果尚未被研究。因此，本研究旨在探讨上颌侧切牙唇舌向位置对正畸医生和非专业人士对微笑美感的影响，并分析男女评价者在这种感知上的差异。
使用 iOrtho7.0 软件（Time Angel，无锡，中国）从一个男人的微笑照片生成一个三维（3D）牙模型。基于该模型，生成了 7 张图像，上颌侧切牙的唇舌向位置分别增加 0.5 毫米（+表示唇向移动，-表示舌向移动）。86 名正畸医生和 161 名非专业人士使用视觉模拟评分法对图像进行评估，得分越低表示吸引力越低。数据采用学生 t 检验和单因素方差分析进行分析，并用事后检验进行比较。
男性和女性的微笑评价没有显著差异。正畸医生对所有图像的评分均低于非专业人士。正畸医生认为+1.5 毫米的微笑最不吸引人，而非专业人士则认为+1.5 毫米和-1.5 毫米的微笑最不吸引人。所有评价者都认为 0 毫米的微笑最吸引人。非专业人士对 0 毫米或-0.5 毫米的微笑给予不同的评分，但正畸医生没有。
上颌侧切牙的唇舌向位置确实会影响微笑美感的感知。正畸医生可能比非专业人士更严格地评价微笑美学。因此，需要正畸医生和患者之间进行沟通和讨论，以达到更好的治疗和美学效果。
