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Intra-class and inter-class tool discrimination through micro-CT analysis of false starts on bone
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Intra-class and inter-class tool discrimination through micro-CT analysis of false starts on bone
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Journal Article
Intra-class and inter-class tool discrimination through micro-CT analysis of false starts on bone
2020
Overview
Micro-CT has successfully been applied to the characterization of false starts (FSs) and, among several parameters, kerf width seems to correlate to the tool blade. The aim of the present study was to evaluate the diagnostic value of micro-CT for the differentiation of saw marks produced by different classes of saws and by saws belonging to the same class and differing only in number of teeth per inches (TPI). A morphological and morphometric analysis of 84 marks, produced by 6 saws belonging to 3 morphological classes, was performed. In the experimental cohort, for each parameter, statistically significant differences in intra- and inter-class analysis were searched for and cut-offs were established. The diagnostic accuracy of cut-offs was assessed through statistical analyses on the validation cohort. The morphological assessment did not allow to differentiate saws differing only in TPI. Angle 1 and top kerf width, respectively for cross-cut and rip-cut saws with alternating set, allowed a good discrimination between FSs produced by tools belonging to the same morphological class. High positive predictive values were found in intra-class analyses, while results in inter-class analyses were less encouraging. In cases of dismemberment, a micro-CT-based analysis of FSs is strongly suggested as a part of a multistep and multimodal methodology of assessment, which includes scanning electron microscopy and stereomicroscopy. A morphological assessment should be followed by an experimental trial and by a morphometric analysis. Further studies are needed to evaluate hampering factors, such as damage by physico-chemical agents.
