Comparison of Dimensional Stability and  Surface Detail Reproduction of Two Elastomeric  Impression Materials Under Dry and Moist  Conditions at Varying Time Intervals

Dr. Nimisha Chaudhry; Dr. Samarth Kumar Agarwal; Dr. Swatantra Kumar Agarwal

Volume : II, Issue : IV, April - 2013

Comparison of Dimensional Stability and Surface Detail Reproduction of Two Elastomeric Impression Materials Under Dry and Moist Conditions at Varying Time Intervals

Dr. Nimisha Chaudhry, Dr. Samarth Kumar Agarwal, Dr. Swatantra Kumar Agarwal

Abstract :

Impression materials may contract or expand after impression making. Therefore, this study was conducted to compare the dimensional stability and surface detail reproduction of commercially available Polyvinylsiloxane and Polyether impression materials in dry and moist conditions at different time intervals. A total of eighty impressions of the custom made stainless steel die were made with both the impression materials in the dry and moist condition according to ADA specification 19. The impressions were tested after one hour, 24 hours and 72 hours of impression making, using a travelling microscope. Under dry as well as moist conditions, polyvinylsiloxane showed significantly higher mean dimensional variation as compared to polyether impression material. Under dry conditions, polyvinylsiloxane showed better surface detail reproduction. Under moist conditions, polyether showed better surface detail reproduction.