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将三维锥形束CT(CBCT)用于人牙咬痕的认定,并通过猪皮载体上的实验咬痕开展其有效性分析。咬痕按照美国法医牙科协会(ABFO)指导原则进行数码拍照。嫌疑人牙模采用两种方法扫描采集数据:第一种是扫描仪扫描,再由常规方法Adobe Photoshop8.0软件生成比较overlay;第二种是使用CBCT三维扫描自动生成比较o-verlay。本研究将咬痕的数码相片分别与两种方法采集的牙模数据进行盲法比较认定,评定使用ROC曲线来分析灵敏度、特异度,并计算95%可信区间。结果显示CBCT法获得较大的ROC曲线下面积:0.784(SE=0.074,95%CI=0.639～0.929);获得相当高的特异度(特异度98.7%,95%CI=94.5%～99.8%)。由此,本研究证明了CBCT是用于人牙咬痕认定的一个有效而准确的工具,具有较强的排除嫌疑人能力,同常规方法相比具有一定的优势,但其比较的过程需要进一步研究以加强其用于咬痕认定的有效性。
The three-dimensional conical beam CT (CBCT) was used to identify human bite marks, and its effectiveness was analyzed by experimental bite marks on the pig skin carrier. The bite marks were digitally photographed according to the guidelines of the American Association of Forensic Dentistry (ABFO). The suspect tooth mold scanning data acquisition using two methods: The first is the scanner scan, and then generated by the conventional method Adobe Photoshop8.0 software comparison overlay; the second is the use of CBCT scan automatically generated compared o-verlay. In this study, digital photographs of bite marks were compared with those obtained by two methods respectively. The ROC curve was used to analyze the sensitivity and specificity, and the 95% confidence interval was calculated. The results showed that the area under ROC curve obtained by CBCT method was larger: 0.784 (SE = 0.074, 95% CI = 0.639-0.929); a very high specificity (specificity 98.7%, 95% CI 94.5% -99.8% . Therefore, this study proved that CBCT is an effective and accurate tool for the determination of occlusion of human teeth, has a strong ability to exclude suspects, and has certain advantages compared with the conventional method, but the process of comparison needs further study To enhance its effectiveness for the identification of bite marks.