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Fire victim identification by post-mortem dental CT:Radiologic evaluation of restorative materials after exposure to high temperatures


Woisetschläger, M; Lussi, A; Persson, A; Jackowski, C (2011). Fire victim identification by post-mortem dental CT:Radiologic evaluation of restorative materials after exposure to high temperatures. European Journal of Radiology, 80(2):432-440.

Abstract

OBJECTIVES: The aim of this study was to evaluate the use of high resolution CT to radiologically define teeth filling material properties in terms of Hounsfield units after high temperature exposure. METHODS: 122 human molars with 10 different filling materials at defined filling diameters were examined. The teeth were CT scanned both before and after the exposure to different temperatures. After image reconstruction, the teeth and filling materials were analyzed regarding their morphology and Hounsfield units (HU) using an extended HU scale. RESULTS: The majority of filling materials diminished in size at temperatures >/=400 degrees C. HU values were stable for all materials up till 200 degrees C, and only slightly changed up to 600 degrees C. Cerec, Dyract and dentin showed only minor changes in HU at all temperatures. The other materials, inclusive enamel, showed specific patterns, either increasing or decreasing in HU with increasing temperatures over 600 degrees C. CONCLUSIONS: Over 600 degrees C the filling materials show specific patterns that can be used to discriminate filling materials. Ultra high resolution CT may improve the identification processes in fire victims. Existing 3D visualization presets for the dentition can be used until 600 degrees C and have to be optimized for bodies exposed to higher temperatures.

OBJECTIVES: The aim of this study was to evaluate the use of high resolution CT to radiologically define teeth filling material properties in terms of Hounsfield units after high temperature exposure. METHODS: 122 human molars with 10 different filling materials at defined filling diameters were examined. The teeth were CT scanned both before and after the exposure to different temperatures. After image reconstruction, the teeth and filling materials were analyzed regarding their morphology and Hounsfield units (HU) using an extended HU scale. RESULTS: The majority of filling materials diminished in size at temperatures >/=400 degrees C. HU values were stable for all materials up till 200 degrees C, and only slightly changed up to 600 degrees C. Cerec, Dyract and dentin showed only minor changes in HU at all temperatures. The other materials, inclusive enamel, showed specific patterns, either increasing or decreasing in HU with increasing temperatures over 600 degrees C. CONCLUSIONS: Over 600 degrees C the filling materials show specific patterns that can be used to discriminate filling materials. Ultra high resolution CT may improve the identification processes in fire victims. Existing 3D visualization presets for the dentition can be used until 600 degrees C and have to be optimized for bodies exposed to higher temperatures.

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9 citations in Web of Science®
11 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Legal Medicine
Dewey Decimal Classification:340 Law
610 Medicine & health
Language:English
Date:2011
Deposited On:19 Jul 2010 12:03
Last Modified:05 Apr 2016 14:12
Publisher:Elsevier
ISSN:0720-048X
Publisher DOI:10.1016/j.ejrad.2010.06.012
PubMed ID:20615643

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