DIMENSIONAL ACCURACY AND STABILITY OF TWO ELASTOMERIC IMPRESSION MATERIALS USING RECENT MIXING TECHNIQUES AND DIFFERENT POURING TIMES

Abstract

This study investigated the dimensional accuracy and stability of both polyether and poly-vinyl siloxane. The study included the effect of using custom-trays versus stock-trays, applying different viscosities, pouring the impressions at different times and repeating each pour.

Using recent mixing systems namely, mechanical system for polyethers and auto-mixing for poly-vinyl siloxane, insured the elimination of human variability during impression mixing of both the base and the catalyst ,thus, increasing the credibility of the results.

Impressions were made for a stainless-steel master model made with three uniformlly distributed abutments to simulate a full-arch preparation. Impressions were then poured with improved stone into stone casts, according to times under investigation.