Li C, Ji G
Department of Forensic Anthropology, China Medical University, Shenyang, People's Republic of China.
Forensic Sci Int. 1995 Oct 30;75(2-3):189-96. doi: 10.1016/0379-0738(95)01791-7.
A new method of age estimation using permanent molars, the method of average stage of attrition (ASA), is described. A total of 633 molars, including the first molar (M1) and the second molar (M2) on both jaws, was collected from 57 cadavers and 54 modern dry skulls in northeast China. The attrition condition of the molar crown was analyzed, and a new graduation standard was established. Six linear equations for age estimation were obtained by means of regression analysis. The ASA method gave an estimated age at death from only one molar, either M1 or M2, on either maxilla or mandible. The maximum error of these equations was 4.53 years. The results show that the ASA method can or does reflect the attrition condition of the whole occlusal surface more objectively than some methods using dental wear because the wear degree is estimated by averaging the wear stages of all the cusps rather than of only one or partial cusps.
本文描述了一种利用恒磨牙进行年龄估计的新方法——磨耗平均阶段法（ASA）。从中国东北地区的57具尸体和54个现代干燥颅骨上共收集了633颗磨牙，包括上下颌的第一磨牙（M1）和第二磨牙（M2）。分析了磨牙牙冠的磨耗情况，并建立了新的分级标准。通过回归分析得到了6个用于年龄估计的线性方程。ASA方法仅通过上颌或下颌的一颗磨牙（M1或M2）就能估计出死亡年龄。这些方程的最大误差为4.53岁。结果表明，与一些利用牙齿磨损的方法相比，ASA方法能够或确实更客观地反映整个咬合面的磨耗情况，因为磨耗程度是通过平均所有牙尖的磨耗阶段来估计的，而不是仅通过一个或部分牙尖。
