Jackowski
Fakultäten » Medizinische Fakultät » Rechtsmedizin, Institut für » Prof. Dr. Walter Bär (emeritiert) » Jackowski
Completed research project
| Title / Titel | Dental CT visualization after exposure to high temperatures: An experimental study | ||||
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| Abstract (PDF, 14 KB) | |||||
| Summary / Zusammenfassung | Dental identification is the most valuable method to identify human remains in single cases with major postmortem alterations as well as in mass casualties because of its practicability and demanding reliability. Computed tomography (CT) has been investigated as a supportive tool for forensic identification and has proven to be valuable. It can also scan the dentition of a deceased within minutes. The recent literature provides approaches for artifact suppression and adequate visualization. However, it is unknown if these approaches also work in cases of charred bodies as the radiopacities of dental restorative material might change after exposure to heat. In the present study, we investigate currently used restorative materials after exposure to high temperatures using ultra-high-resolution dual-source CT and the extended CT scale for the purpose of a color-encoded, in scale, and artifact-free visualization in 3D volume rendering. In 122 human molars, 220 cavities with 2-, 3-, 4- and 5-mm diameter were prepared. With presently used filling materials (different composites, temporary filling materials, ceramic, and liner), these cavities were restored in six teeth for each material and cavity size (exception amalgam n = 1). The teeth were burned following a defined termperature scheme. Afterwards the teeth were CT scanned and images reconstructed using an extended CT scale. Filling materials are analyzed in terms of resulting Hounsfield units (HU) and filling size representation within the images. A comparision of the CT behavior of each filling material over different temperatures is carried out. The study aims on an optimisation of the dental CT visualisation in volume rendering for charred bodies. |
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| Publications / Publikationen | Jackowski C, Aghayev E, Sonnenschein M, Dirnhofer R, Thali MJ (2005) Maximum intensity projection of cranial computed tomography data for dental identification. Int J Legal Med, 20:1-3Jackowski C, Lussi A, Classens M, Kilchoer T, Bolliger S, Aghayev E, Christe A, Dirnhofer R, Thali MJ (2006) Extended CT scale overcomes restoration caused streak artifacts – 3D color encoded automatic discrimination of dental restorations for identification J Comput Assist Tomogr, 30(3):510-3.Sidler M, Jackowski C, Dirnhofer R, Vock P, Thali M. (2007) Use of multislice computed tomography in disaster victim identification-- advantages and limitations. Forensic Sci Int, 169(2-3):118-28.Jackowski C, Wyss M, Persson A, Classens M, Thali MJ, Lussi A (2008) Ultra High Resolution Dual Source CT for Forensic Dental Visualization – Discrimination of Ceramic and Composite Fillings Int J Legal Med, 122(4):301-7. |
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| Keywords / Suchbegriffe | dental CT, dental identification, charred body | ||||
| Project leadership and contacts / Projektleitung und Kontakte |
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| Funding source(s) / Unterstützt durch |
SNF (Personen- und Projektförderung), Others |
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| In collaboration with / In Zusammenarbeit mit |
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| Duration of Project / Projektdauer | Jan 2008 to Jun 2010 |