NCJ Number
226904
Journal
Journal of Forensic Sciences Volume: 54 Issue: 3 Dated: May 2009 Pages: 658-661
Date Published
May 2009
Length
4 pages
Annotation
This paper describes a method for creating 3D software models of a suspect’s dentition for comparison with bitemark evidence, in order to determine whether the suspect made the bitemark.
Abstract
The results showed an easily reproducible, objective method that correctly matched an individual dentition model to bitemarks produced by that individual. The proposed method used the ABFO number 2 scale developed by Krauss and Hyzer for correcting for most photographic plane distortions of bitemarks in conjunction with the evolving technologies of laser scanners and comparative software commonly used by the automobile industry for 3D analysis. The impression of the dentition of the subject (upper and lower) was made into acrylic models. They were mounted on a number 11 vice grip to create bitemarks on the legs and abdomen of a refrigerated, non-embalmed male cadaver. Bitemarks were documented according to the ABFO guidelines for the collection of bitemark evidence. Impressions of the bitemarks were taken in a resilient dental impression material. A model of the deepest bitemark and the model that made the wound pattern were scanned by a third party as described. After scanning, commercially available software, Geomagic Version five was used to determine the extent to which the bitemark and the detention correlated. This software is used to compare various manufactured parts for accuracy in many industries, including the automotive industry. Accuracy is noted by the different colors displayed, with red being the most accurate, followed by yellow. In matching dentition models to bitemark models, the comparative software by Geomagic tells the examiner which points of reference match and the degree of match by the color of each individual area. The scanning methodology and inspection process are described in detail. 8 figures and 6 references