Abstract：
The marks left by the bite of a subject (bitemark) represent an unequivocal character, being useful in identifying the possible perpetrator of a crime. To date, the analysis of bitemarks is mainly based on the direct vision of photographic finds and on the visual comparison with the teeth of the hypothetically responsible person. However, the bitemark also retains three-dimensional characteristics detectable with a 3D scanner. In this pilot study, an innovative method of bitemark analysis, utilizing a three-dimensional scanner and some software, will be introduced, enabling a quantitative comparison of bitemarks and their corresponding human dentitions. For this purpose, 10 complete plaster models (human dentitions) of 10 adult subjects were used to make 20 experimental bitemarks on dentistry wax. All materials were individually scanned with the iTero® 3D scanner and reworked with MeshMixer software. A visual analysis of the characteristics and a computerized analysis with the CloudCompare software were also performed. Study showed a different trend of the distribution curves of the points which were obtained comparing the human dentition and coincident and non-coincident bitemarks. Current results support that the intraoral 3D scanner allows the fast record and the preservation of the three-dimensional characteristics of the bitemarks, and it allows computerized analyses to be carried out.
摘要：
对象咬伤留下的痕迹（bitemark）代表了明确的特征，有助于确定犯罪的可能肇事者。迄今为止,对bitemarks的分析主要基于摄影发现的直接视觉以及与假设负责人的牙齿的视觉比较。然而,bitemark还保留了3D扫描仪可检测的三维特性。在这项试点研究中，一种创新的bitemark分析方法，利用三维扫描仪和一些软件，将被介绍，能够定量比较bitemarks及其相应的人类牙列。为此,使用10个成年受试者的10个完整的石膏模型（人类牙列）在牙科蜡上制作20个实验性bitemarks。用iTero®3D扫描仪单独扫描所有材料,并用MeshMixer软件重新加工。还进行了特征的视觉分析和使用CloudCompare软件的计算机化分析。研究表明，比较人类牙列以及重合和非重合位标记所获得的点的分布曲线具有不同的趋势。目前的结果支持口内3D扫描仪允许快速记录和保留bitemarks的三维特征，它允许进行计算机化分析。
