Bernhard W, Glöckler C
Institut für Anthropologie der Johannes Gutenberg-Universität Mainz.
Z Morphol Anthropol. 1995 Dec;81(1):111-23.
A sample of 1,310 girls, 5 to 13 years of age, drawn from Mainz, Wiesbaden and vicinity was studied to establish the eruption time of the permanent dentition. The data of the median date of eruption of different teeth was determined employing a nonparametric test for the estimation of a survivorship function with doubly censored data (TURNBULL 1974). The method presented shows a marked superiority over other techniques used to verify the median date of eruption. The diachronic comparison of several samples--mainly from the Rhine-Main-Area-encompassing the years 1909 till today, showed no uniform trend towards an earlier eruption date. In some cases, temporal differences were ascertained which can be readily attributed to varied definitions of dental status. Furthermore, a recalculation--using this innovative mathematical approach--of a sample from the Frankfurt area, originally studied by FRANZ (1938) did not show any unambiguous acceleration tendencies-at least not within the past 50 years. These results suggest that the human dentition is predominantly genetically determined and therefore environmental factors play a by far lesser role than in general physical development.
从美因茨、威斯巴登及其周边地区抽取了1310名5至13岁的女孩作为样本，以确定恒牙的萌出时间。采用非参数检验来估计具有双重截尾数据的生存函数（TURNBULL，1974），从而确定不同牙齿萌出的中位日期数据。所提出的方法相较于用于验证萌出中位日期的其他技术具有显著优势。对几个样本（主要来自莱茵 - 美因地区，涵盖1909年至今）的历时比较表明，恒牙萌出日期没有统一的提前趋势。在某些情况下，发现了时间差异，这很容易归因于对牙齿状态的不同定义。此外，使用这种创新的数学方法对法兰克福地区最初由FRANZ（1938年）研究的一个样本进行重新计算，结果并未显示出任何明确的加速趋势——至少在过去50年里没有。这些结果表明，人类牙齿的发育主要由基因决定，因此环境因素在其中所起的作用远小于在一般身体发育中的作用。
