| Project/Area Number |
07672242
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
矯正・小児・社会系歯学
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| Research Institution | Kanagawa Dental College |
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Principal Investigator |
OHTANI Susumu Kanagawa Dental College Lecturer Department of Dentistry, 歯学部, 講師 (60104478)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1997: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1996: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1995: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Tooth / Dentin / Age Estimation / Amino acid / Racemization / D-aspartic acid / Gas chromatograph / 加齢変化 / 法医学 / 固定液 / エタノール / ホルマリン |
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| Research Abstract |
An investigation into racemization of aspartic acid in dentin (D/L ratio) was carried out for the realization of a more accurate dental age estimate.
1.Influence of pH :
The influence of pH (4 and 9) on teeth was investigated by a heating experiment for precise estimation of age at death. The reaction rate was highest in dentin in a pH 9 environment, followed by that in water, that in a pH 4 environment, and that in a dry state.
2.Influence of fixative :
We investigated and compared the degree of progression of racemization of dentinal aspartic acid in teeth stored in 95% ethanol, 10% formalin, or 10% neutral formalin fixatives. The racemization rate of dentinal aspartic acid in teeth stored in 10% neutral formalin was the highest, followed by that for teeth stored in 10% formalin then that for teeth stored in 95% ethanol. Teeth stored in these fixatives at 15ﾟC showed almost no progression of racemization.
3.Influence of pink teeth :
Age was estimated from pink teeth utilizing the racemization of dentinal aspartic acid. These results suggest that age estimated from pink teeth are probably underestimated but that a more accurate age estimate can be obtained after adequate washing.
4.Age estimation from racemization rate using heated teeth :
The ratio was higher in heated than in unheated teeth for total amino acid, but approximately the same for soluble peptide. These results suggest that age calculated from the D/L ratio of dentinal soluble peptide from burned bodies is sufficiently accurate for this parameter to be used to estimate age in teeth from burned bodies.
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