Estimation of Age from a Tooth by Means of Racemization of an Amino Acid, Especially Aspartic Acid—Comparison of Enamel and Dentin

    Volume 37, Issue 4 (July 1992)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Page Count: 7


    Yamamoto, K
    Lecturer and professor, Kanagawa Dental College, Yokosuka, Kanagawa,

    Ohtani, S
    Lecturer and professor, Kanagawa Dental College, Yokosuka, Kanagawa,

    (Received 10 September 1991; accepted 18 November 1991)

    Abstract

    In a study of age estimation from teeth by means of measuring racemization of aspartic acid (Asp), a representative amino acid, the accuracy of data from enamel and dentin in the same tooth was compared.

    The correlation of D/L ratio of aspartic acid with actual age gave the following parameters: r = 0.928, σ = ±5.2, k = 4.47 × 10−4 yr−1 in enamel and r = 0.995, σ = ±1.4, k = 5.75 × 10−4 yr−1. The difference in ages between one estimated by the D/L ratio and the actual one was within ±3 years in dentin, while in enamel an error of from 2 to 11 years was observed. Reaction rate constants of the racemization in a dry postmortem state (15°C) were calculated as k = 9.70 × 10−8 yr−1 in enamel, and k = 1.33 × 10−7 yr−1 in dentin. Compared to rates determined from teeth recently extracted from living subjects, the rate was higher in dentin than in enamel. These data reconfirmed that dentin is superior to enamel in making exact age estimations from teeth.


    Paper ID: JFS13292J

    DOI: 10.1520/JFS13292J

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    Title Estimation of Age from a Tooth by Means of Racemization of an Amino Acid, Especially Aspartic Acid—Comparison of Enamel and Dentin
    Symposium , 0000-00-00
    Committee E30