Ohtani Susumu, Yamamoto Toshiharu
Institute for Frontier Oral Science, Kanagawa Dental College, 82 Inaoka-cho Yokosuka, 238-8580 Kanagawa, Japan.
J Forensic Sci. 2011 Jan;56(1):244-7. doi: 10.1111/j.1556-4029.2010.01545.x. Epub 2010 Aug 23.
Racemization method is currently considered to be one of the most accurate methods for age estimation. There are many factors that affect racemization reaction velocities. We investigated ethnic differences in the racemization reaction velocities between Japanese and Scandinavian teeth. After a heating experiment, the Arrhenius equation was used to obtain a rate constant (k). Both groups presented almost identical velocities, indicating that there was no difference in the tooth racemization reaction between the two groups. However, because 14 of the 18 Scandinavian teeth had multiple roots, it is possible that accurate racemization rates of the teeth themselves were not reflected in the results. These findings reconfirm that the type of tooth selected is extremely important when evaluating age by racemization.
外消旋化法目前被认为是年龄估计最准确的方法之一。有许多因素会影响外消旋化反应速度。我们研究了日本人和斯堪的纳维亚人牙齿外消旋化反应速度的种族差异。经过加热实验后，使用阿伦尼乌斯方程来获得速率常数（k）。两组的反应速度几乎相同，表明两组牙齿的外消旋化反应没有差异。然而，由于18颗斯堪的纳维亚人牙齿中有14颗有多个牙根，有可能牙齿本身的准确外消旋化率并未在结果中体现出来。这些发现再次证实，通过外消旋化评估年龄时，所选牙齿的类型极为重要。
