Liu Ying, Geng Kun, Chu Yanhao, Xu Mindi, Zha Lagabaiyila
Department of Oral and Maxillofacial Surgery, Xiangya Stomatological Hospital, Central South University, No72. Xiangya Road, Kaifu District, Changsha, Hunan Province, China.
Xiangya Stomatological Collage, Central South University, No72. Xiangya Road, Kaifu District, Changsha, Hunan Province, China.
Int J Legal Med. 2018 Sep;132(5):1427-1435. doi: 10.1007/s00414-018-1804-x. Epub 2018 Mar 3.
The purpose of this study is to provide a forensic reference data about estimating chronologic age by evaluating the third molar mineralization of Han in central southern China. The mineralization degree of third molars was assessed by Demirjian's classification with modification for 2519 digital orthopantomograms (1190 males, 1329 females; age 8-23 years). The mean ages of the initial mineralization and the crown completion of third molars were around 9.66 and 13.88 years old in males and 9.52 and 14.09 years old in females. The minimum ages of apical closure were around 16 years in both sexes. Twenty-eight at stage C and stage G and 38 and 48 at stage F occurred earlier in males than in females. There was no significant difference between maxillary and mandibular teeth in males and females except that stage C in males. Two formulas were devised to estimate age based on mineralization stages and sexes. In Hunan Province, the person will probably be over age 14, when a third molar reaches the stage G. The results of the study could provide reference for age estimation in forensic cases and clinical dentistry.
本研究的目的是通过评估中国中南部汉族人群第三磨牙的矿化情况，提供有关估计年龄的法医参考数据。对2519张数字化曲面断层片（1190名男性，1329名女性；年龄8 - 23岁）采用改良的Demirjian分类法评估第三磨牙的矿化程度。男性第三磨牙开始矿化和牙冠完成的平均年龄分别约为9.66岁和13.88岁，女性分别约为9.52岁和14.09岁。两性根尖闭合的最小年龄均约为16岁。处于C期和G期的28例以及处于F期的38例和48例，男性比女性出现得更早。除男性的C期外，男性和女性的上颌牙和下颌牙之间没有显著差异。根据矿化阶段和性别设计了两个公式来估计年龄。在湖南省，当第三磨牙达到G期时，此人可能超过14岁。本研究结果可为法医案件和临床牙科中的年龄估计提供参考。
