Endo Toshiya, Shundo Isao, Abe Ryota, Ishida Katsuyuki, Yoshino Sugako, Shimooka Shohachi
Orthodontic Dentistry, The Nippon Dental University Niigata Hospital, Niigata, Japan.
Odontology. 2007 Jul;95(1):57-60. doi: 10.1007/s10266-007-0066-8. Epub 2007 Jul 25.
Previous studies have shown that tooth size ratios are ethnicity-, race-, and sex-specific. This study was carried out to determine anterior and overall ratios in a Japanese population and to compare them with Bolton's ratios. Numerical data were obtained from 60 pairs of dental casts of 30 male and 30 female Japanese orthodontic patients. The mesiodistal widths from first molar to first molar were measured on each cast to the nearest 0.01 mm, by using digital calipers, and the anterior and overall ratios were calculated. The Kolmogorov-Smirnov test, the parametric t test, and Student t test were used for statistical analyses. No statistically significant difference between men and women was found in either the anterior or overall ratio. The combined male and female anterior and overall ratios were 78.39 +/- 2.18% and 91.60 +/- 2.11%, respectively. The combined male and female anterior ratio showed a statistically significant difference from the Bolton standard, whereas the overall ratio showed no statistically significant difference. Significant discrepancies in the anterior and overall ratios were found in 21.6% and 8.3% of patients, respectively. A high prevalence rate of an anterior tooth size discrepancy more than 2SD above Bolton's mean was found. Bolton's anterior ratio was not applicable to the Japanese population, and specific standard tooth size ratios for the Japanese population are needed.
以往研究表明，牙齿大小比例存在种族、民族和性别特异性。本研究旨在确定日本人群的前牙和整体比例，并与博尔顿比例进行比较。从30名日本男性和30名日本女性正畸患者的60副牙模中获取数值数据。使用数字卡尺在每副牙模上测量从第一磨牙到第一磨牙的近远中宽度，精确到0.01毫米，并计算前牙和整体比例。采用柯尔莫哥洛夫-斯米尔诺夫检验、参数t检验和学生t检验进行统计分析。在前牙比例或整体比例方面，未发现男性和女性之间存在统计学上的显著差异。男性和女性合并的前牙和整体比例分别为78.39±2.18%和91.60±2.11%。男性和女性合并的前牙比例与博尔顿标准存在统计学上的显著差异，而整体比例未显示出统计学上的显著差异。分别在21.6%和8.3%的患者中发现前牙和整体比例存在显著差异。发现前牙大小差异超过博尔顿均值2个标准差的患病率较高。博尔顿前牙比例不适用于日本人群，需要针对日本人群制定特定的标准牙齿大小比例。
