Postgraduate student, Department of Dentistry, University of Taubate, Taubate, SP, Brazil.
J Esthet Restor Dent. 2009;21(5):318-22. doi: 10.1111/j.1708-8240.2009.00283.x.
Dento-facial harmony is essential to obtain adequate esthetics and a successful treatment. Therefore, the aim of the present study was to analyze the existence of polar symmetry, obtained by two parallel lines, one along the pupils and another along the incisal edge of the upper central incisor teeth of 102 dental students distributed across five Brazilian dental schools.
One hundred and two students with no missing teeth, who had never been subjected to any kind of dental treatment, not even orthodontic treatment, were selected and photographed using a dental eye II camera (Yashica-Kyocera Optics Inc., Somerset, NJ, USA) with a macro-objective lens of 100 mm and using a scale of 1:10 of the natural size. All the individuals were positioned parallel to the plane of Frankfurt and to the ground, and were photographed smiling in order to expose the central incisors. The pictures were transformed into digital images (1,840 x 1,252 pixels) and analyzed later using Microsoft Office Power Point 2007 software. Two lines (along the pupils and another along the maxillary incisive teeth) were drawn, and the inclination obtained was generated by the program itself. Symmetrical cases were classified as "yes" (Y), and the remainder as "no" (N). Cases were also divided according to gender. Results were statistically assessed by analysis of variance and Student's t-test (alpha = 0.05).
There was a statistically significant correlation between the line parallel with the pupils and the tangent of the incisal edge of the incisors, irrespective of gender.
Regardless of gender, there is a correlation between the pupils and the tangent with the incisal edge of the maxillary central incisors. CLINICAL SIGNIFICANCE Despite diversity in individuals, facial and anatomic measurements may aid in the execution and planning of rehabilitation treatments. (J Esthet Restor Dent 21:318-323, 2009).
牙颌面和谐对于获得足够的美观和成功的治疗至关重要。因此，本研究的目的是分析 102 名牙科学员的上下中切牙切缘与瞳孔平行的两条线是否存在极性对称，这些学员分布在巴西的五所牙科学校。
选择了 102 名无缺牙且从未接受过任何类型的牙科治疗（甚至正畸治疗）的学生，使用带有 100mm 微距镜头的牙科眼 II 相机（Yashica-Kyocera Optics Inc.，Somerset，NJ，USA）和 1:10 的自然尺寸比例尺对其进行拍照。所有个体均与法兰克福平面和地面平行定位，并在微笑时进行拍照以暴露中切牙。将照片转换为数字图像（1,840 x 1,252 像素），然后使用 Microsoft Office Power Point 2007 软件进行分析。绘制两条线（一条与瞳孔平行，另一条与上颌切牙平行），程序本身会生成获得的倾斜度。对称的病例被归类为“是”（Y），其余的为“否”（N）。根据性别对病例进行分类。使用方差分析和学生 t 检验（α=0.05）对结果进行统计学评估。
无论性别如何，与瞳孔平行的线与切牙切缘的切线之间均存在统计学上的显著相关性。
无论性别如何，瞳孔与上颌中切牙切缘切线之间均存在相关性。临床意义尽管个体存在差异，但面部和解剖学测量可能有助于执行和规划康复治疗。（J Esthet Restor Dent 21:318-323, 2009）。
