2022 Fiscal Year Final Research Report
A method for estimating time since death through analysis of substances deposited on the surface of dental enamel in a body immersed
| Project/Area Number |
20K18811
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 57080:Social dentistry-related
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| Research Institution | Tokyo Dental College |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 水中死体 / 死後経過時間 / エナメル質 / 歯科 / 法歯学 |
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| Outline of Final Research Achievements |
In this study, through analyzing the enamel deposits of teeth while simulating a corpse immersed in freshwater, we were able to calculate a regression equation to estimate the time of immersion in water, which provided good results. A similar regression equation assuming a corpse in seawater has already been reported, and it was possible to establish an estimation method corresponding to two types of water components. While there are various methods for estimating the time after death, we were able to reiterate the usefulness of forensic odontology.
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| Free Research Field |
法歯学
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| Academic Significance and Societal Importance of the Research Achievements |
これまでの主な死後経過時間の推定方法は、高度に腐敗あるいは白骨状態になると急激にその能力は失われる。さらに、直腸温度による手法等を除くとそのほとんどは鑑定人の視覚的な判断に大きく影響するため、各鑑定人による鑑定結果に誤差が生じる事も否定出来ない。それに対し本研究は、付着した水含有物の定量的分析という視覚的な判断を排除した方法の開発を目的とした。この方法を確立する事により、鑑定人による誤差を最小限に抑え、水中浸漬時間推定法の一助になる上、迅速な個人識別につながるものと期待出来る。
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