Private practice, Montclair, Calif.
Private practice, Houston, Texas.
J Prosthet Dent. 2017 Oct;118(4):504-510. doi: 10.1016/j.prosdent.2016.10.035. Epub 2017 Mar 23.
As the cosmetic demands of patients increase, determining the appropriate dimensions of the maxillary anterior teeth has become increasingly relevant. The relationship between facial measurements and tooth size provide guidance for maxillary anterior tooth size selection. However, most publications on this topic have focused on the white population, and more data for tooth sizes and their proportions in other ethnicities are needed.
The purpose of this observational study was to investigate the relationship between the mesiodistal dimensions of the 6 maxillary anterior teeth and the bizygomatic width, interpupillary distance, intercanthal distance, interalar width, and intercommissural width of individuals of Asian, African-American, and white ethnicities.
Standardized digital images of 360 participants (120 Asian, 120 African-American, and 120 white) were used to measure facial segments. Individual dimensions of the 6 maxillary anterior teeth were measured using stone casts with digital sliding caliper. The combined width of the 6 maxillary anterior teeth on a straight line corresponded to the sum of the anterior tooth width. The means and standard deviations from descriptive measurements were calculated and analyzed for face and maxillary anterior tooth ratios and correlations. Statistical analysis was done using the Kruskal-Wallis procedure to compare facial and tooth parameters among the 3 ethnicities. Appropriate post hoc comparisons that adjusted for multiple testing were conducted when warranted (α=.05). The Spearman rho correlation, a nonparametric correlate of the Pearson correlation, was used to associate the facial and tooth parameters within the strata of sex and ethnicity.
No consistent ratios were found among the examined facial dimensions and the mesiodistal dimensions of the 6 maxillary anterior teeth among the 3 ethnicities, except for the central incisor width-to-bizygomatic width ratio. No correlations were found between the facial dimensions and mesiodistal dimensions of the 6 maxillary anterior teeth among the 3 ethnicities except in Asian women. For Asian women, the intercommissural width correlated with the width of the central incisor (P=.001), the width of 2 central incisors (P=.001), the width of 4 incisors (P=.003), and the width of 6 maxillary anterior teeth (P=.005).
No facial proportions by which the exact width of maxillary anterior teeth could be predicted were found in Asian, African-American, or white populations.
随着患者对美容的需求不断增加，确定上颌前牙的适当尺寸变得越来越重要。面部测量值与牙齿大小之间的关系为上颌前牙大小的选择提供了指导。然而，大多数关于这个主题的出版物都集中在白种人群体上，需要更多关于其他种族的牙齿大小及其比例的数据。
本观察性研究的目的是调查亚洲人、非裔美国人和白种人 6 颗上颌前牙的近远中尺寸与面宽、瞳孔间距离、内眦间距离、眼距和鼻间宽之间的关系。
使用 360 名参与者（亚洲人 120 名、非裔美国人 120 名和白种人 120 名）的标准化数字图像来测量面部部位。使用带有数字滑动卡尺的石印模测量 6 颗上颌前牙的个体尺寸。6 颗上颌前牙的直线宽度之和对应于前牙宽度之和。计算并分析描述性测量的平均值和标准差，以分析面部和上颌前牙的比例和相关性。使用 Kruskal-Wallis 程序对 3 个种族的面部和牙齿参数进行比较。当需要时（α=.05）进行适当的事后比较，以调整多重检验。在性别和种族的分层内，使用 Spearman rho 相关系数（Pearson 相关系数的非参数相关系数）来关联面部和牙齿参数。
除了中切牙宽度与面宽的比例外，在 3 个种族中，没有发现检查的面部尺寸与 6 颗上颌前牙的近远中尺寸之间存在一致的比例。除了亚洲女性外，在 3 个种族中都没有发现面部尺寸与 6 颗上颌前牙的近远中尺寸之间存在相关性。对于亚洲女性，鼻间宽与中切牙的宽度（P=.001）、2 颗中切牙的宽度（P=.001）、4 颗切牙的宽度（P=.003）和 6 颗上颌前牙的宽度（P=.005）相关。
在亚洲人、非裔美国人和白种人群体中，没有发现可以预测上颌前牙确切宽度的面部比例。
