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The addition type silicon impression materials, polyvinyl siloxanes have been reported to be most accurate and dimensionally stable. There is much discussion in the accurate fit of cast restoration. Several impression techniques have been advocated for obtaining accuracy of casts using a combination of putty-wash, heavy body, light body and medium body consistency of impression materials. The purpose of this study was to find out the most accurate polyvinyl silxoane puttyreline impression techniques for the fabrication of the most accurate stone dies. In this study, metallic models of two identical Fixed partial Denture abutments were prepared with the size of 12mm, 10mm and 8mm in diameter. The distance between the two abutments was measured using a traveling microscope A total of 40 impression were made. All the impression were poured to obtain the casts, and were evaluated to assess the dimensional stability of four different polyvinyl siloxane putty reline impression techniques. The inter abutment distance was highest in Group I2.447 and least was in Group IV2.415. Percentage deviation from master model of each impression technique was highest in Group III0.77% and least in Group IV0.24%. Within the limitations of the study, a) Poly vinyl siloxance puttyreline one step impression technique is the most accurate for the fabrication of stone dies b) Among the two – step putty reline techniques, two step with polyethylene spacer was accurate technique, as the lining thickness increased the dies made from these impression were least accurate.

Evaluation of Accuracy of Polyvinyl Silxoane Putty Reline Impression Techniques for the Fabrication of Dies