Accuracy of stone-casts produced from selected addition-type silicone impressions.

The present study has shown that there is no correlation between the free curing contraction of three selected addition-type silicone impression materials and the effective contraction determined as the accuracy of stone dies produced in dental impressions of these materials. Depending on specific rheologic properties, the free curing contraction of an impression material can be partly compensated for by flow. [ABSTRACT FROM AUTHOR]