Biomechanical Approach to Human Bitemark Reconstruction

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Title Biomechanical Approach to Human Bitemark Reconstruction
Author Radford, G.; Kieser, J.A.; Bernal, V.; Waddell, J.N.; Forrest, Alexander Stewart
Journal Name Journal of Forensic Odontostomatology
Editor Jules Kieser
Year Published 2009
Place of publication New Zealand
Publisher International Organization for Forensic Odonto-Stomatology
Abstract This paper investigates the changes in upper and lower dental bite records that occur when the anterior teeth occlude into a three-dimensional rather than a flat object. Methods: anterior bite registrations were obtained from 20 volunteers with full and unrestored dentitions. As a three dimensional, life-like bite target we cast a silicone replica from the impression of an actual arm, fitted with a rigid bony interior. Each participant was asked to bite into a single layer of softened bite registration wax wrapped around the same location on the fake arm, as well as into a flat wafer of the same material. Upper and lower bite registrations were then scanned in the same location on a flat bed scanner. We analysed the sizes of the different bite marks by means of landmark- and semi-landmark analysis to calculate Procrustes distances between tooth outlines. In order to analyse shape variation between the two types of bite registration we carried out principal components analyses on the partial warp scores. These were derived from partial Procrustes coordinates aligned by means of thin-plate spline decomposition based on a bending energy matrix. Our results show that there are significant differences in the shape of the upper or lower teeth when they occlude into a flat or three dimensional target. We conclude that the use of a traditional flat bite registration in human bitemark reconstruction and analysis has to be seriously questioned.
Peer Reviewed Yes
Published Yes
Publisher URI
Copyright Statement Copyright 2009 JFOS. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 27
Issue Number 1
Page from 33
Page to 36
ISSN 0258-414X
Date Accessioned 2009-07-09
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Dentistry
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1a

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