Article information
Year 2018 Volume 68 Issue 2 Page 165-172
Title:
Age Estimation using Segmented Pulp/Tooth Area Ratio Method in Thai Population
Keyword(s):
Age estimation, Maxillary central incisor, Periapical radiograph, Pulp/tooth area ratio
Abstract:
The aims of this study were to develop an age estimation equation in Thai population using segmented pulp/tooth area ratio (sPTR) and to test the reliability of that equation. The sample consisted of 400 digital periapical images of right maxillary central incisors derived from 163 men and 237 women aged between 10.03 and 81.61 years (mean=32.38 years). sPTR measurement modified from the Cameriere’s method was performed in the 400 samples. Subsequently, statistical analysis was performed in order to generate a regression model for age estimation. Then, another 103 samples were tested for the accuracy of the regression model. The difference between the chronological age and the estimated age was statistically calculated. The correlation coefficient was statistically significant, with r=-0.86 (p<0.05). The power regression model for the Thai sample yielded the following equation: Age=0.790×sPTR(-2.059). The coefficient of determination (R2) was 0.82. The mean difference value between the estimated and the chronological ages was -0.80. The mean absolute error (MAE) was 4.26 years. The standard error of prediction (SEP) was 5.70 years. In conclusion, the sPTR on the maxillary central incisor we firstly proposed in this study can be useful for age estimation in Thais.