Comparison of the dimensional accuracy of a combined reversible/irreversible hydrocolloid impression system with other commonly used impression materials

An investigation was conducted to compare the difference in dimensional accuracy of a combined reversible/irreversible hydrocolloid impression system and the dimensional accuracies of other commonly used impression systems. No statistically significant difference's were found between the measurements of the various materials tested and those of the master model, which leads to the conclusion that the dimensional accuracies of all the materials tested were similar. The advantages and disadvantages of each material observed during the study were reported.