Swetha G, Kattappagari Kiran Kumar, Poosarla Chandra Shekar, Chandra Lalith Prakash, Gontu Sridhar Reddy, Badam Venkata Ramana Reddy
Department of Oral and Maxillofacial Pathology, SIBAR Institute of Dental Sciences, Guntur, Andhra Pradesh, India.
J Oral Maxillofac Pathol. 2018 Jan-Apr;22(1):138-142. doi: 10.4103/jomfp.JOMFP_175_17.
This study aims to examine the correlation between age and number of incremental lines in human dental cementum among single-rooted teeth (incisors and canines) and to assess the best tooth to estimate age group by studying cementum under phase-contrast microscope and to assess the use of cementum in age estimation.
The present study was carried out in the Department of Oral Pathology and Microbiology. A sample of eighty single-rooted undecalcified longitudinal ground sections is prepared from freshly collected teeth with age noted separately and observed under phase-contrast microscope, photographed and counted. Counting the number of alternating dark and light lines of the cementum and adding them to the average age at which the analyzed tooth erupts provided an estimate of the chronological age of the individual.
The results obtained in the present study were statistically significant and positive correlation was observed between the actual age and the estimated age. The number of incremental lines was found to be gradually increased with increase in age of the individual. On an average, ±2 years of age difference were observed in our study on comparing the actual age with estimated age.
Hence, the incremental lines of the cementum were found to be gradually increased with increase in age and hence can be used as one of the adjuvant tools in dental age estimation.
本研究旨在探讨单根牙（切牙和尖牙）中人类牙骨质的年龄与生长线数量之间的相关性，通过在相差显微镜下研究牙骨质来评估用于估计年龄组的最佳牙齿，并评估牙骨质在年龄估计中的应用。
本研究在口腔病理学与微生物学系进行。从新鲜采集的牙齿制备80个单根未脱钙纵向磨片样本，分别记录年龄，并在相差显微镜下观察、拍照和计数。计算牙骨质明暗交替线的数量，并将其与被分析牙齿萌出时的平均年龄相加，从而得出个体的实际年龄估计值。
本研究获得的结果具有统计学意义，实际年龄与估计年龄之间存在正相关。发现生长线的数量随着个体年龄的增长而逐渐增加。在我们的研究中，将实际年龄与估计年龄进行比较时，平均观察到±2岁的年龄差异。
因此，发现牙骨质的生长线随着年龄的增长而逐渐增加，因此可作为牙齿年龄估计的辅助工具之一。
