Evaluation of the accuracy, precision and validity of hydrophylic vinyl polysiloxane impression material for bite mark analysis
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Date
2011-05-17
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Abstract
The present study was undertaken to assess the accuracy, precision and validity of hydrophilic Vinyl Poly Siloxane [VPS] impression material for bite mark documentation and analysis. Medium body VPS impressions of maxillary and mandibular anterior teeth among thirty subjects
were taken and dental stone casts prepared. Hollow volume overlays were made and
metric analysis was done using advanced imaging software like Adobe Photoshop - 9 and Image J. These values were compared to the measurements taken from bite mark impressions of the same 30 individuals on wax wafers using light body VPS material. The mean differences in the parameters measured by the different techniques were compared using Intra Class Correlation
Coefficients [ICCC]. Additionally validity parameters such as sensitivity, specificity,
positive and negative predictive value were computed.
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Keywords
bite marks, forensic odontology, forensic science, hollow volume overlays, metric analysis, Vinyl Poly Siloxane impression