数字全口牙位曲面体层片的法医学同一认定指标

目的采用颌面全口牙位曲面体层片,针对牙齿无病变者筛选简洁实用的法医学同一认定识别指标并进行编码、统计分析及评估。方法随机选取170例牙齿无病变者的颌面数字全口牙位曲面体层片进行观测．根据牙齿的生理变异特征和牙齿的排列特征分别筛选全口牙型和牙列型识别指标。按设计的编码标准对全口牙型、牙列型逐一编码,统计分析编码的多样性,以评估两类识别指标的应用价值。结果170例中共有74种全口牙型编码,多样性为43．53％：170例中共有129种牙列型编码,多样性为75．88％;170例同时进行全口牙型和牙列型编码．则共有150种全口牙型／牙列型编码,多样性为88．24％。结论全口牙型编码多样性较低,单独使用尚不能满足法医学同一认定的要求。牙列型编码的多样性比较高,具有一定的法医学同一认定价值。如果同时进行全口牙型和牙列型编码,多样性明显提高,有较高的法医学同一认定价值。

Indexes of forensic identification by the digital orthopantomogram of the normal teeth

Objective To explore more concise and unified forensic identification indexes for people with none dental disease in digital orthopantomogram.Methods To select randomly 170 digital orthopantomogram with none dental disease.Then to select indexes for full dentition patterns and dental alignment patterns according to the dental physiological variations and the characters of dental alignment respectively.Finally diversity of the indexes would be evaluated by statistical analysis.Results The group with none dental disease had 74 kinds of full dentition pattern in 170 samples,thus its diversity was 43.53%.The group had 129 kinds of dental alignment pattern,thus its diversity was 75.88%.The group had 150 kinds of full dentition/dental alignment pattern,thus its diversity was 88.24%.Conclusion The diversity of the full dentition pattern was not very good.So the full dentition coding was not very effective when it was used solely.The diversity of dental alignment pattern was good.So the method of dental alignment coding could be used in the maxillofacial forensic identification.If the group was coded by the full dentition and dental alignment pattern at the same time,its diversity was better than any single pattern.So the method would be valuable in forensic identification.