Comparative study of Dimensional stability and accuracy of various elastomaric materials

Abstract

Introduction: Transfer of an accurate replication of the patient’s hard and soft tissue to the dental laboratory is important. An accurate impression will result in a precise fitting cast restoration. Recently a new impression material Vinyl Siloxanether by the manufacturer has been made commercially available. The objective of this in vitro study is to compare the newer material with older ones in terms of accuracy. Methodology A stainless steel model containing two tapered abutments with cross grooves on occlusal and proximal surface for reference measurement was fabricated on a lathe. Total eighty samples were made. Sixteen impressions were made with polyether (medium body), poly Vinylsiloxane (medium body, heavy & light body) and vinyl siloxanether (medium body, heavy & light body) each. The recommended tray adhesive was used for all impression materials and was poured using Type IV gypsum. A Travelling microscope was used to assess dimensions (diameter, height and inter abutment distance) on stone cast poured from the impression of stainless steel model. One-way ANOVA test, Tukey HSD test were used for statistical analysis. Results All casts yielded from five study groups were bigger in the dimensions. The newly formulated vinyl siloxanether impression material yielded more accurate casts than those of addition silicone and polyether impression materials. Conclusion The newly formulated vinyl siloxanether impression material yielded more accurate impressions. The vinyl siloxanether impression material yielded more accurate casts than those of addition silicone and polyether impression materials