India.
Jouf University, Saudi Arabia.
J Forensic Odontostomatol. 2022 Aug 30;40(2):10-20.
The main intention of this article was to evaluate the reliability of root dentine translucency (RDT) and the width of cementum (CW) in indicating the age over 55 years in forensic and criminal investigations. 600 non-restored, single rooted teeth (300 males and 300 females) which were extracted for periodontal or orthodontic reasons were collected. Each tooth was sectioned longitudinally until the desired thickness (250 µm) was obtained. Both the length of the RDT and CW were measured from these unstained ground sections of teeth using ImageJ computer software. Pearson's correlation coefficient indicated a very strong and positive correlation for RDW and CW with age in both sexes. Cut-off values of RDT= 7.07 and CW= 52.06 were obtained using the maximum Youden's index. The value for the area under the curve (AUC) was 0.987 for RDT and 0.910 for CW was seen as indicating a very high discrimination. The performance of these cut-off values was tested in a separate sample of sectioned teeth (n= 300) and was analyzed using contingency tables in both sexes. The sensitivity was 88.2% and 92.3%, while specificity was 98.9% for RDT in males and females. For CW, the sensitivity was 96.1% and 90.3%, and specificity was 76.7% and 74.4% in males and females, respectively. Bayes post-test probability was 98.9% for RDT in both sexes, while 80.5% in males and 78% in females, for CW. Based on our study findings, it can be concluded that both variables have performed well in predicting the age over 55 years. Further research concerning the radiographic study of secondary dentine deposition to predict legal age thresholds would be a great benefit for living adults who require age estimation in civil proceedings.
本文主要目的是评估根牙本质半透明度（RDT）和牙骨质宽度（CW）在法医和犯罪调查中指示年龄超过 55 岁的可靠性。收集了 600 颗未修复的单根牙（300 颗男性和 300 颗女性），这些牙齿因牙周或正畸原因而被拔出。每颗牙齿都被纵向切割，直到获得所需的厚度（250 µm）。使用 ImageJ 计算机软件从这些未染色的牙齿研磨切片中测量 RDT 和 CW 的长度。Pearson 相关系数表明，在两性中，RDT 和 CW 与年龄之间存在非常强的正相关。使用最大 Youden 指数获得 RDT=7.07 和 CW=52.06 的截断值。RDT 的曲线下面积（AUC）值为 0.987，CW 为 0.910，表明具有非常高的鉴别力。在另一组切片牙齿样本（n=300）中测试了这些截断值的性能，并在两性中使用列联表进行了分析。在男性和女性中，RDT 的敏感性分别为 88.2%和 92.3%，特异性分别为 98.9%。对于 CW，敏感性分别为 96.1%和 90.3%，特异性分别为 76.7%和 74.4%。在两性中，RDT 的贝叶斯后验概率分别为 98.9%，而 CW 分别为 80.5%和 78%。基于我们的研究结果，可以得出结论，这两个变量在预测年龄超过 55 岁方面表现良好。进一步研究二次牙本质沉积的放射影像学以预测法定年龄阈值将对需要在民事诉讼中进行年龄估计的成年生活者大有裨益。
