The need of age estimation for identification was increased by complexity of socidty, and the tooth was used widely for age estimation because of less individual deviation than the other organ.
The age estimation using the tooth had several methods. Recently, the one using the racemization of sminoacid in the tooth was admitted more accurate than the other methods, especially in old age. But, this study was not tried in our country, and I would report the result of experiment about age estimation wing racemization of dentine.
I selected 40- Whole dentine sample from extracted teeth, those were reserved in natural dried condition (o 2 weeks- 1 year and calculated the estimation of age from the ratio of D-aminoacid and L-aminoacid (D./ L ratio) using gaschromatography and the results were below.
L The aminoacida showed apparent D / L ratio in dentine were aspartic acid, serine.
2. The aspartic acid showed the highest racemic rate and its rate was 0.0012±OA003 / yr.
3 The relation between the actual age and D / L ratio was very pbsitive corelation(r=0.954) in the es
timation of age using aspartic acid.
.4. The deviation between the estimated age using D / L ratio of aspartic acid and actual age was ±3.32.
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