Kutschy Josef M, Ampanozi Garyfalia, Berger Nicole, Ruder Thomas D, Thali Michael J, Ebert Lars C
Department of Forensic Medicine and Imaging, Institute of Forensic Medicine, University of Zürich, Winterthurerstrasse 190/52, 8057, Zurich, Switzerland.
Forensic Sci Med Pathol. 2014 Dec;10(4):543-9. doi: 10.1007/s12024-014-9595-y. Epub 2014 Aug 13.
The goal of this study was to investigate whether different computed tomography (CT) energy levels could supply additional information for the differentiation of dental materials for forensic investigations.
Nine different commonly used restorative dental materials were investigated in this study. A total of 75 human third molars were filled with the restorative dental materials and then scanned using the forensic reference phantom in singlesource mode. The mean Hounsfield unit values and standard deviations (SDs) of each material were calculated at 120, 80 and 140 kVp.
Most of the dental materials could be differentiated at 120 kVp. We found that greater X-ray density of a material resulted in higher SDs and that the material volume could influence the measurements.
Differentiation of dental materials in CT was possible in many cases using single-energy CT scans at 120 kVp. Because of the number of dental restorative materials available and scanner and scan parameter dependence, as well as the CT imaging artifacts, the identification (in contrast to differentiation) was problematic.
本研究的目的是调查不同的计算机断层扫描（CT）能量水平是否能为法医调查中牙科材料的鉴别提供额外信息。
本研究调查了九种不同的常用牙科修复材料。总共75颗人类第三磨牙用牙科修复材料填充，然后使用法医参考体模在单源模式下进行扫描。在120、80和140 kVp下计算每种材料的平均亨氏单位值和标准差（SDs）。
大多数牙科材料在120 kVp时可以区分。我们发现材料的X射线密度越高，标准差越高，并且材料体积会影响测量结果。
在许多情况下，使用120 kVp的单能量CT扫描可以在CT中区分牙科材料。由于可用的牙科修复材料数量、扫描仪和扫描参数的依赖性以及CT成像伪影，识别（与区分相对）存在问题。
