Upalananda Witsarut, Khwankaew Krittaporn, Chormanee Kewalin, Chinkanjanaroj Apisamai, Pethpand Taechinee
Section of Oral and Maxillofacila Radiology, Department of Oral Diagnostic Sciences, Faculty of Dentistry, Prince of Songkla University, Thailand.
Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
J Forensic Odontostomatol. 2024 Dec 30;42(3):28-38. doi: 10.5281/zenodo.14562134.
This study aims to compare the accuracy of Demirjian's and Cameriere's methods in determining adult age at the 18-year threshold using mandibular third molars in the Thai population. Panoramic radiograph images of 504 healthy subjects aged between 14 and 23 years were retrospectively collected. The developmental stages of mandibular third molars were evaluated using Demirjian's method, while the maturity index of mandibular third molars (I3M) was assessed using Cameriere's method. Comparing the development of the left and right mandibular third molars, slight differences were observed: the left side developed 0.06 stages faster (p = 0.01) and had an I3M 0.01 higher (p < 0.01). For the 18-year age threshold, Demirjian's Stage H demonstrated a specificity of 1.00 for both sexes on the left mandibular third molar, and 0.97 for males and 1.00 for females on the right. I3M < 0.08 yielded specificities of 0.84 for males and 0.93 for females on the left, and 0.82 for males and 0.91 for females on the right. Reducing the cut-off to I3M < 0.02 improved specificity to 1.00 for both sexes on the left side, and 0.96 for males and 1.00 for females on the right. Notably, using Demirjian's Stage H and I3M < 0.02, the probability of being over 18 years was 1.00 for females on both sides, and 0.96 for males on the left and 1.00 on the right. Our study recommends using an I3M cutoff of <0.02 for adult age assessment in the Thai population, as it achieves high specificity comparable to Demirjian's Stage H, with effective differentiation of adults.
本研究旨在比较德米尔坚法和卡梅里埃法在利用泰国人群下颌第三磨牙确定18岁临界年龄时的准确性。回顾性收集了504名年龄在14至23岁之间的健康受试者的全景X光片图像。使用德米尔坚法评估下颌第三磨牙的发育阶段，同时使用卡梅里埃法评估下颌第三磨牙的成熟指数（I3M）。比较左右下颌第三磨牙的发育情况，观察到细微差异：左侧发育快0.06个阶段（p = 0.01），I3M高0.01（p < 0.01）。对于18岁临界年龄，德米尔坚H期在下颌左侧第三磨牙上对两性的特异性均为1.00，在右侧对男性为0.97，对女性为1.00。I3M < 0.08时，左侧对男性的特异性为0.84，对女性为0.93，右侧对男性为0.82，对女性为0.91。将临界值降低至I3M < 0.02时，左侧对两性的特异性提高到1.00，右侧对男性为0.96，对女性为1.00。值得注意的是，使用德米尔坚H期和I3M < 0.02时，两侧女性超过18岁的概率均为1.00，左侧男性为0.96，右侧男性为1.00。我们的研究建议在泰国人群中使用I3M临界值<0.02进行成年年龄评估，因为它能达到与德米尔坚H期相当的高特异性，有效区分成年人。
