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Different racemization ratios in dentin from different locations within a tooth

¹Department of Forensic Medicine, Kanagawa Dental College, Yokosuka, Japan.

Growth, Development, and Aging : GDA

|July 1, 1997

Summary

The D/L aspartic acid ratio in dentin varies by tooth region, particularly between lingual and labial sides. This suggests non-uniform aspartic acid racemization rates influenced by factors like temperature.

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Area of Science:

Biochemistry
Dental Science
Forensic Anthropology

Background:

D-aspartic acid accumulation in dentin correlates with age.
Further research is needed to understand the precise correlation and regional variations.

Purpose of the Study:

To quantitatively determine L- and D-aspartic acid levels in dentin.
To calculate the D/L aspartic acid ratio and analyze its variations within teeth.

Main Methods:

Quantitative analysis of L- and D-aspartic acids in dentin samples.
Calculation of the D/L aspartic acid ratio.
Comparison of ratios between different tooth regions (crown, root apex) and sides (lingual, labial, vestibular).

Main Results:

No significant D/L ratio difference was found between left and right teeth or between vestibular and lingual root dentin.
The D/L ratio was significantly higher on the lingual side compared to the labial side of dentin.
In young subjects, the D/L ratio decreased from crown to root apex, but this trend was inconsistent in older individuals.

Conclusions:

The D/L aspartic acid ratio in dentin is not uniform and varies regionally, especially between lingual and vestibular crown dentin.
Aspartic acid racemization rates differ across dentin regions, potentially influenced by localized factors like temperature.
These findings contribute to understanding dentin aging and potential forensic applications.

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