Department of Oral Radiology, Faculty of Dentistry & Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Forensic Sci Int. 2010 Apr 15;197(1-3):121.e1-4. doi: 10.1016/j.forsciint.2009.12.051. Epub 2010 Jan 8.
Many methods of age estimation have been suggested, and of these, the Demirjian method is the most frequently used. The objective of the present study is to test the accuracy of the Demirjian method for age estimation in an Iranian population.
A cross-sectional study involving 141 boys and 170 girls selected by a convenience sampling method was carried out. Panoramic radiography was used to score the left mandibular teeth and to obtain the Demirjian tooth age.
The Demirjian method overestimated the age of boys by 0.34 years and girls by 0.25 years. The scatter plots showing the difference between estimated dental age and chronological age for boys and girls showed that the regression lines had a decreasing trend with age. The mean difference between estimated dental age and chronological age in boys decreased with age (except in the oldest age group of boys). In contrast, it increased in girls between the ages of 6-8 years old, and then decreased.
The results show that the Demirjian method is appropriate for estimating the dental age of patients, especially those belonging to the 9-13 year old age group. However, in the younger age groups, further study involving more cases is required.
已经提出了许多种年龄估计方法，其中 Demirjian 法是最常用的方法。本研究的目的是检验 Demirjian 法在伊朗人群中进行年龄估计的准确性。
采用便利抽样法选取 141 名男孩和 170 名女孩进行横断面研究。通过全景片对左侧下颌牙齿进行评分，并获得 Demirjian 牙龄。
Demirjian 法高估了男孩的年龄 0.34 岁，高估了女孩的年龄 0.25 岁。显示男孩和女孩的估计牙龄与实际年龄之间差异的散点图表明，回归线随年龄呈下降趋势。男孩的估计牙龄与实际年龄之间的平均差异随年龄的增加而减小（除了年龄最大的男孩组外）。相比之下，女孩在 6-8 岁之间增加，然后减少。
结果表明，Demirjian 法适用于估计患者的牙龄，尤其是 9-13 岁年龄组的患者。然而，在年龄较小的组中，需要进一步研究更多的病例。
