Racemization in enamel among different types of teeth from the same individual
Racemization in enamel among different types of teeth from the same individual
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DOI：
10.1007/s00414-004-0506-8
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发表时间：
2005-03-01
影响因子：
2.1
通讯作者：
Yamamoto, T
中科院分区：
文献类型：
--
作者：
Ohtani, S;Ito, R;Yamamoto, T
我们测量了同一个体不同类型牙釉质中d -天冬氨酸的含量（天冬氨酸消旋度）。我们研究了外消旋程度与每个特定牙齿形成时间的相关性，以及外消旋程度对实际年龄估计的适用性。在环境条件相同的情况下，在最早完成形成的牙齿中，外消旋化程度最高。牙釉质的外消旋化程度在不同类型的牙齿中存在差异，即使在同一个体中也是如此。磨牙牙釉质外消旋化程度高于门牙牙釉质外消旋化程度，且与牙釉质形成时间不一致。这可能是由于位于口腔深处的磨牙区比前牙区环境温度更高，并且由于牙釉质中的D/L比低于牙本质，因此牙釉质比牙本质更容易受到呼吸空气的影响。使用牙釉质，通过计算每一种牙齿的外消旋程度，而不是把所有不同的牙齿放在一起，可以更好地估计出实际年龄。然而，这些估计的年龄并不比牙本质的估计更好。
We measured the quantity of D-aspartic acid (degree of racemization of aspartic acid) in the enamel of different types of teeth from the same individual. We studied the correlation between the degree of racemization and the time of formation of each particular tooth, as well as the applicability of the degree of racemization to estimation of chronological age. If the environmental condition of the teeth is the same, the degree of racemization is expected to be highest in teeth that completed formation in the earliest period of time. Different degrees of racemization in enamel were found among different types of teeth, even in the same individual. The degree of racemization in enamel was found to be higher in molars than in incisors, and showed a tendency that did not necessarily coincide with the time of formation. This seemed to be due to the fact that the environmental temperature was higher in the molar region located deeper in the oral cavity than the front region, and that enamel was more affected by breathing air than dentin because the D/L ratios in enamel were lower than those in dentin. Using enamel, a better estimation of chronological age was obtained from calculations based on the degree of racemization of each type of tooth than from all the different teeth together. However, these estimated ages were not better than those from dentin.