Comparison of Dimensional Accuracies Using Two Elastomeric Impression Materials in Casting Three-dimensional Tool Marks.
The purpose of this study was to evaluate two types of impression materials which were frequently used for casting three-dimensional tool marks in China, namely (i) dental impression material and (ii) special elastomeric impression material for tool mark casting. The two different elastomeric impression materials were compared under equal conditions. The parameters measured were dimensional accuracies, the number of air bubbles, the ease of use, and the sharpness and quality of the individual characteristics present on casts. The results showed that dental impression material had the advantage of special elastomeric impression material in casting tool marks in crime scenes; hence, it combined ease of use, dimensional accuracy, sharpness and high quality.
Key Laboratory of Impression Evidence Examination and Identification Technique of MPS, National Police University of China, 83 Ta-wan Street, Huang-gu District, Shenyang, 110035, China.
Zhen
Z
Wang
cast; dimensional accuracies; elastomeric impression materials; forensic science; three-dimensional tool marks; tool marks