Ilayaraja Vadivel, Ganapathy Nalliapan, Jisha Georgebabu, Keerthipriyadharshini Thambu, Maheswaran Thangadurai, Yoithapprabhunath Thukanayakanpalayam R
Department of Oral and Maxillofacial Pathology, Vivekanandha Dental College for Women, Tamilnadu, India.
Open Dent J. 2018 Sep 28;12:762-769. doi: 10.2174/1745017901814010762. eCollection 2018.
In recent years, the estimation of age in living individuals have become important to solve judicial or civil problems. Secondary dentin deposition occurs as the age advances and can be measured by calculating the reduction in pulp chamber through Noninvasive radiograph techniques.
The aim is to derive precise population specific formulae for age estimation.
Digitalized Orthopantomography of 150 subjects, was retrieved. The subjects were divided into study and test group. Pulp tooth area ratio was recorded from the maxillary canine and pulp chamber crown root trunk height ratio was recorded from a mandibular first molar.
Regression equation was derived from study group subjects and this equation was used to estimate the age of subjects in the test group.
No significant differences were seen between mean chronological age and mean estimated age (-value- 0.157). Mean Absolute Error (MAE) was estimated to be 2.76 years. The percentage of estimated ages in test sample < ± MAE was 72%. The difference was higher in the group I and II (-value- 0.001 and 0.002).
The equation derived from the anterior and posterior teeth together gave more accurate results in the present study. The prediction accuracy can further be enhanced by using multiple teeth or by utilizing other linear measurements in the same teeth.
近年来，对在世个体的年龄估计对于解决司法或民事问题变得至关重要。随着年龄增长会发生继发性牙本质沉积，可通过无创放射成像技术计算牙髓腔的缩小来测量。
目的是得出针对特定人群的精确年龄估计公式。
检索了150名受试者的数字化曲面断层片。将受试者分为研究组和测试组。记录上颌尖牙的牙髓牙面积比，记录下颌第一磨牙的牙髓腔冠根干高度比。
从研究组受试者得出回归方程，并使用该方程估计测试组受试者的年龄。
实际年龄均值与估计年龄均值之间未见显著差异（P值 = 0.157）。平均绝对误差（MAE）估计为2.76岁。测试样本中估计年龄 < ± MAE的百分比为72%。在第一组和第二组中差异更大（P值 = 0.001和0.002）。
在本研究中，由前后牙共同得出的方程给出了更准确的结果。通过使用多颗牙齿或利用同一颗牙齿的其他线性测量，预测准确性可进一步提高。
