Abdullah Mohammed Aleem
College of Dentistry, King Saud University, Riyadh, Kingdom of Saudi Arabia.
J Prosthet Dent. 2002 Jul;88(1):16-20.
Estimating the mesiodistal width of maxillary central incisors may be difficult when artificial teeth are selected for edentulous subjects. PURPOSE This study examined the relationship between inner canthal distance and maxillary central incisor mesiodistal width in terms of the geometric progression popularly known as the golden proportion.
Two hundred twenty-nine dentate Saudi subjects (120 males, 109 females; mean age 21.46 years) free from facial and dental deformities were examined. The mesiodistal width of each maxillary central incisor was measured between its interproximal contact points. The inner canthal distance was measured from medial angle to medial angle of the palpebral fissures of the eyes. The common ratios of geometric progression are 0.618 and 1.618. The inner canthal distance of each subject was multiplied by a decreasing function value of the geometric progression term (0.618) to provide the combined width of 2 central incisors. The product was then divided by 2 to obtain the width of a single maxillary central incisor. A t test was used to identify any significant differences in mesiodistal tooth width and inner canthal distance by gender. Agreement between the measured and calculated central incisor widths was evaluated with Pearson's correlation coefficients, as was intraexaminer reliability. Significance was set at alpha=.05.
The mean inner canthal distance of male and female subjects was 28.7 +/- 1.7 mm and 27.9 +/- 2.1 mm, respectively. The mean maxillary central incisor width of male and female subjects was 8.87 +/- 0.5 mm and 8.68 mm +/- 0.4 mm, respectively. Differences between the mean values for both measurements were significant (P =.002). The actual and calculated widths of the natural maxillary central incisors were found to be highly correlated (r =.943).
Within the population tested, a significantly higher mean inner canthal distance and maxillary central incisor width were recorded for male subjects. Inner canthal distance, when multiplied by a decreasing function value of the geometric progression term and then divided by 2, was a reliable predictor of maxillary central incisor width.
为无牙颌患者选择人工牙时，估计上颌中切牙的近远中宽度可能会有困难。目的：本研究根据通常称为黄金比例的几何级数，研究内眦间距与上颌中切牙近远中宽度之间的关系。
对229名无面部和牙齿畸形的沙特有牙颌受试者（120名男性，109名女性；平均年龄21.46岁）进行检查。测量每个上颌中切牙在其邻接点之间的近远中宽度。内眦间距从眼睛睑裂的内角到内角进行测量。几何级数的公比为0.618和1.618。将每个受试者的内眦间距乘以几何级数项的递减函数值（0.618），以提供两颗中切牙的联合宽度。然后将乘积除以2，以获得单个上颌中切牙的宽度。采用t检验确定按性别分类的近远中牙宽度和内眦间距的任何显著差异。用Pearson相关系数评估测量的和计算的中切牙宽度之间的一致性，以及检查者内部的可靠性。显著性设定为α = 0.05。
男性和女性受试者的平均内眦间距分别为28.7±1.7mm和27.9±2.1mm。男性和女性受试者的平均上颌中切牙宽度分别为8.87±0.5mm和8.68±0.4mm。两种测量平均值之间的差异具有显著性（P = 0.002）。发现天然上颌中切牙的实际宽度和计算宽度高度相关（r = 0.943）。
在测试人群中，男性受试者的平均内眦间距和上颌中切牙宽度显著更高。内眦间距乘以几何级数项的递减函数值然后除以2，是上颌中切牙宽度的可靠预测指标。
