A COMPARATIVE EVALUATION OF DIMENSIONAL ACCURACY OF POLYVINYL SILOXANE AND VINYL POLYETHER SILICONE USING TWO IMPRESSION TECHNIQUES ON PORCELAIN LAMINATE VENEER TOOTH PREPARATION A AN INVITRO STUDY

The aim of this invitro study was to comparitively evaluate dimensional accuracy of PVS and VPES impression materials using 2 impression techniques on porcelain laminate veneer tooth preparation. A standard porcelain laminate veneer with four microscopic dimples of 1 mm dimension on a right maxillary central incisor was prepared on a typhodont and it was casted to obtain a standard stainless-steel die. Total 60 samples were made which was divided into 6 groups(based on the impression material and type of tray used). All the impressions were poured using type IV gypsum and dimensions were microscopically determined using toolmakers measuring microscope. Data was analysed using Independent t-test and One-way Anova test followed by Post hoc Tukeys test. The level of significance was set at 0.05 at 95% confidence interval. The anterior dual arch metal trays produced more accurate results among trays and in materials, VPES showed more accurate results.