Narayan V Keerthi, Varsha V K, Girish H C, Murgod Sanjay
Department of Oral Pathology and Microbiology, Rajarajeswari Dental College and Hospital, Bengaluru, Karnataka, India.
J Forensic Dent Sci. 2017 Sep-Dec;9(3):157-164. doi: 10.4103/jfo.jfds_43_16.
Age has been considered as a reliable marker for establishing the identity of a person in the field of forensic medicine. Teeth are useful skeletal indicators of age at death since it can survive for decades. Nondestructive methods ensure the evident preservation of dental hard tissues that reflect age changes from the cradle to the grave. Therefore, an attempt was made for estimating the age using the nondestructive method.
The aim of this study to assess whether physiological changes of the teeth allow possible correlation for accurate age estimation and to establish a graduation standard by microscopic observation for a better age correlation.
The study was carried on 209 teeth samples extracted for orthodontic treatment or periodontal diseases comprised both maxillary and mandibular teeth across different age groups. The assessment of these changes was carried out by well-established standard methods with some proposed modifications.
Pearson correlation analyses revealed root dentin translucency with the highest correlation ( = 0.97) followed by periodontal ligament attachment ( = 0.95), root dentin color ( = 0.95), and attrition being the least correlated ( = 0.90). All the parameters taken for the study contributed to stepwise linear regression analysis ( = 0.98; < 0.01) indicating a strongly positive relationship between age and the changes observed. A regression formula was obtained with mean error age difference ±1.0 years.
The present study showed that extracted tooth is highly significant in identifying the age without being sectioned or further processed and also signifies the use of microscope for observation of these changes, thus reducing the errors of calibrating the age.
在法医学领域，年龄一直被视为确定个人身份的可靠标志。牙齿是推断死亡年龄有用的骨骼指标，因为它可以保存数十年。非破坏性方法可确保明显保留反映从出生到死亡年龄变化的牙齿硬组织。因此，人们尝试使用非破坏性方法估计年龄。
本研究的目的是评估牙齿的生理变化是否有助于进行准确的年龄估计，并通过显微镜观察建立一个分级标准，以实现更好的年龄关联。
本研究对因正畸治疗或牙周疾病而拔除的209颗牙齿样本进行，这些样本包括不同年龄组的上颌牙和下颌牙。这些变化的评估通过既定的标准方法进行，并做了一些建议的修改。
Pearson相关分析显示，牙根牙本质透明度的相关性最高（r = 0.97），其次是牙周膜附着（r = 0.95）、牙根牙本质颜色（r = 0.95），磨耗的相关性最低（r = 0.90）。本研究采用的所有参数都有助于逐步线性回归分析（r = 0.98；P < 0.01），表明年龄与观察到的变化之间存在强正相关。获得了一个平均误差年龄差异为±1.0岁的回归公式。
本研究表明，拔除的牙齿在不进行切片或进一步处理的情况下对确定年龄具有高度显著性，并且还表明使用显微镜观察这些变化，从而减少年龄校准的误差。
