Gupta Shalini, Chandra Akhilesh, Agnihotri Archana, Gupta Om Prakash, Maurya Niharika
Department of Oral Pathology and Microbiology, King George's Medical University, Lucknow, Uttar Pradesh, India.
Department of Oral Pathology and Microbiology, Vananchal Dental College and Hospital, Garhwa, Jharkhand, India.
J Forensic Dent Sci. 2017 Jan-Apr;9(1):42. doi: 10.4103/jfo.jfds_76_14.
The aims of the present study were to measure translucency on sectioned teeth using available computer hardware and software, to correlate dimensions of root dentin translucency with age, and to assess whether translucency is reliable for age estimation.
A pilot study was done on 62 freshly extracted single-rooted permanent teeth from 62 different individuals (35 males and 27 females) and their 250 μm thick sections were prepared by micromotor, carborundum disks, and Arkansas stone. Each tooth section was scanned and the images were opened in the Adobe Photoshop software. Measurement of root dentin translucency (TD length) was done on the scanned image by placing two guides (A and B) along the x-axis of ABFO NO. 2 scale. Unpaired -test, regression analysis, and Pearson correlation coefficient were used as statistical tools.
A linear relationship was observed between TD length and age in the regression analysis. The Pearson correlation analysis showed that there was positive correlation ( = 0.52, = 0.0001) between TD length and age. However, no significant ( > 0.05) difference was observed in the TD length between male (8.44 ± 2.92 mm) and female (7.80 ± 2.79 mm) samples.
Translucency of the root dentin increases with age and it can be used as a reliable parameter for the age estimation. The method used here to digitally select and measure translucent root dentin is more refined, better correlated to age, and produce superior age estimation.
本研究的目的是使用现有的计算机硬件和软件测量切片牙齿的透明度，将牙根牙本质透明度的尺寸与年龄相关联，并评估透明度是否可用于可靠的年龄估计。
对来自62个不同个体（35名男性和27名女性）的62颗新鲜拔除的单根恒牙进行了一项初步研究，并使用微型电机、碳化硅盘和阿肯色石制备了厚度为250μm的切片。对每个牙齿切片进行扫描，并在Adobe Photoshop软件中打开图像。通过沿着ABFO NO.2标尺的x轴放置两个标尺（A和B），在扫描图像上测量牙根牙本质透明度（TD长度）。使用非配对t检验、回归分析和Pearson相关系数作为统计工具。
回归分析显示TD长度与年龄之间存在线性关系。Pearson相关分析表明，TD长度与年龄之间存在正相关（r = 0.52，P = 0.0001）。然而，男性（8.44±2.92mm）和女性（7.80±2.79mm）样本的TD长度之间未观察到显著差异（P>0.05）。
牙根牙本质的透明度随年龄增加，可作为年龄估计的可靠参数。这里使用的数字选择和测量半透明牙根牙本质的方法更精确，与年龄的相关性更好，并且能产生更准确的年龄估计。
