Mathew Deepu George, Rajesh S, Koshi Elizabeth, Priya Lakshmi E, Nair Amal S, Mohan Aparna
Department of Oral and Maxillofacial Pathology, Mar Baselios Dental College, Kothamangalam, Kerala, India.
J Forensic Dent Sci. 2013 Jan;5(1):56-9. doi: 10.4103/0975-1475.114552.
To develop an independent procedure for estimating age for Indian individuals using radiographs of multi-rooted posterior teeth with accuracy needed in forensic age prediction.
Orthopantomography (OPG) was obtained for 88 subjects. The subjects were divided into two sub sets; study subset (n = 60) which were used to find regression formula to calculate the age from pulp chamber height and test subset (n = 28) which were used to test the accuracy of this formula.
There was a statistically significant strong correlation between chronological age and pulp chamber crown root trunk height ratio (r = -0.56; P = 0.000). The regression equation for estimating the age, derived from the study subset was estimated age = -100.920 (PCTHR) +55.415. (PCTHR is the pulp chamber crown root trunk height ratio). This equation was applied on the test subset and there was no significant difference between estimated ages and chronological ages (P = 0.639). The mean absolute error (MAE) was 6.96 years, which was within acceptable error limits for forensic age estimation (<±10 years).
The procedure developed to estimate the age using height reduction in pulp chamber was found to be fairly accurate to perform forensic age prediction in Indian individuals.
开发一种独立的方法，利用多根后牙的X光片来估计印度个体的年龄，以满足法医年龄预测所需的准确性。
为88名受试者获取了口腔全景片（OPG）。受试者被分为两个子集；研究子集（n = 60）用于寻找根据髓室高度计算年龄的回归公式，测试子集（n = 28）用于测试该公式的准确性。
实际年龄与髓室冠根干高度比之间存在统计学上显著的强相关性（r = -0.56；P = 0.000）。从研究子集中得出的用于估计年龄的回归方程为估计年龄 = -100.920（PCTHR）+55.415。（PCTHR是髓室冠根干高度比）。该方程应用于测试子集，估计年龄与实际年龄之间无显著差异（P = 0.639）。平均绝对误差（MAE）为6.96岁，在法医年龄估计的可接受误差范围内（<±10岁）。
利用髓室高度降低来估计年龄的方法在对印度个体进行法医年龄预测时被发现相当准确。
