Bagherpour Ali, Anbiaee Najmeh, Partovi Parnia, Golestani Shayan, Afzalinasab Shakiba
Oral & Maxillofacial Radiology, Dental Research Center, Faculty of Dentistry, Mashhad University of Medical Sciences, P.O. Box 91735-984, Mashhad, Iran.
J Forensic Leg Med. 2012 Oct;19(7):407-12. doi: 10.1016/j.jflm.2012.04.009. Epub 2012 May 25.
In recent years, a noticeable increase in forensic age estimations of living individuals has been observed. Radiologic assessment of the mineralisation stage of third molars is of particular importance, with regard to the relevant age group. To attain a referral database and regression equations for dental age estimation of unaccompanied minors in an Iranian population was the goal of this study. Moreover, determination was made concerning the probability of an individual being over the age of 18 in case of full third molar(s) development.
Using the scoring system of Gleiser and Hunt, modified by Köhler, an investigation of a cross-sectional sample of 1274 orthopantomograms of 885 females and 389 males aged between 15 and 22 years was carried out. Using kappa statistics, intra-observer reliability was tested. With Spearman correlation coefficient, correlation between the scores of all four wisdom teeth, was evaluated. We also carried out the Wilcoxon signed-rank test on asymmetry and calculated the regression formulae.
A strong intra-observer agreement was displayed by the kappa value. No significant difference (p-value for upper and lower jaws were 0.07 and 0.59, respectively) was discovered by Wilcoxon signed-rank test for left and right asymmetry. The developmental stage of upper right and upper left third molars yielded the greatest correlation coefficient. The probability of an individual being over the age of 18 is 95.6% for males and 100.0% for females in case four fully developed third molars are present. Taking into consideration gender, location and number of wisdom teeth, regression formulae were arrived at.
Use of population-specific standards is recommended as a means of improving the accuracy of forensic age estimates based on third molars mineralisation. To obtain more exact regression formulae, wider age range studies are recommended.
近年来，活体个体法医年龄估计的数量显著增加。对于相关年龄组而言，第三磨牙矿化阶段的放射学评估尤为重要。本研究的目的是建立一个伊朗无人陪伴未成年人牙齿年龄估计的转诊数据库和回归方程。此外，还确定了第三磨牙完全发育时个体超过18岁的概率。
采用经克勒修改的格莱泽和亨特评分系统，对885名女性和389名年龄在15至22岁之间的男性的1274张全景X线片进行横断面样本调查。使用kappa统计量检验观察者内信度。用Spearman相关系数评估四颗智齿评分之间的相关性。我们还对不对称性进行了Wilcoxon符号秩检验，并计算了回归公式。
kappa值显示出很强的观察者内一致性。Wilcoxon符号秩检验未发现左右不对称有显著差异（上下颌的p值分别为0.07和0.59）。右上和左上第三磨牙的发育阶段相关性系数最大。如果有四颗完全发育的第三磨牙，男性个体超过18岁的概率为95.6%，女性为100.0%。考虑到性别、智齿位置和数量，得出了回归公式。
建议使用特定人群标准，以提高基于第三磨牙矿化的法医年龄估计的准确性。为了获得更精确的回归公式，建议进行更广泛年龄范围的研究。
