Naini Farhad B, Manouchehri Shaadi, Al-Bitar Zaid B, Gill Daljit S, Garagiola Umberto, Wertheim David
Kingston and St George's Hospitals and St George's Medical School, Blackshaw Road, London, SW17 0QT UK.
London, UK.
Maxillofac Plast Reconstr Surg. 2019 Aug 20;41(1):31. doi: 10.1186/s40902-019-0214-4. eCollection 2019 Dec.
To test the hypothesis that in profile smiling view, for ideal aesthetics, a tangent to the labial face of the maxillary central incisor crowns should be approximately parallel to the true vertical line and thereby perpendicular to the true horizontal line.
An idealized female image was created with computer software and manipulated using the same software to construct an "ideal" female profile image with proportions, and linear and angular soft tissue measurements, based on currently accepted criteria for idealized Caucasian profiles. The maxillary incisor labial face tangent was altered in 5° increments from 70 to 120°, creating a range of images, shown in random order to 70 observers (56 lay people and 14 clinicians), who ranked the images from the most to the least attractive. The main outcome was the preference ranks of image attractiveness given by the observers.
The most attractive inclination of a tangent to the labial face of the maxillary incisor crowns in profile view in relation to the true horizontal line was 85°, i.e. 5° retroclined from a perpendicular 90° inclination. The most attractive range appears to be between 80 and 90°. Excessive proclination appeared to be less desirable than retroclination. Beyond 105° most observers recommend treatment.
In natural head position, the ideal inclination of the maxillary incisor crown labial face tangent in profile view will be approximately parallel to the true vertical line and thereby approximately perpendicular to the true horizontal line.
为验证如下假设，即在侧面微笑视图中，为达到理想美学效果，上颌中切牙牙冠唇面的切线应大致平行于真垂线，从而垂直于真水平线。
使用计算机软件创建一个理想化的女性图像，并使用同一软件进行处理，以构建一个具有比例以及线性和角度软组织测量值的“理想”女性侧面图像，该图像基于目前公认的理想化白种人侧面标准。上颌切牙唇面切线以5°的增量从70°改变到120°，创建一系列图像，以随机顺序展示给70名观察者（56名非专业人员和14名临床医生），他们对这些图像从最有吸引力到最没吸引力进行排序。主要结果是观察者给出的图像吸引力偏好排名。
在侧面视图中，上颌中切牙牙冠唇面切线相对于真水平线最具吸引力的倾斜度为85°，即从垂直的90°倾斜度向后倾斜5°。最具吸引力的范围似乎在80°至90°之间。过度前倾似乎不如后倾理想。超过105°时，大多数观察者建议进行治疗。
在自然头位时，侧面视图中上颌切牙牙冠唇面切线的理想倾斜度将大致平行于真垂线，从而大致垂直于真水平线。
