The purpose of this research was to make a comparative study between different systems of impression materials, such as polysulfide, condensation and addition-curing silicones, using a new non-destructive technique of evaluation, and consequently clinically applicable. After obtaining three element nickel-chromium prosthesis, three-dimensional replicas of the space between the restoration and the prepared tooth were made, using a condensation curing silicone. These replicas were microscopically evaluated. The results showed that, although some materials presented a superior behavior, as Permlastic and Extrude, other tested materials had an acceptable clinical behavior provided that their molds had been properly manipulated, specially regarding the time of cast pouring
Dental impression materials; Dental prosthesis; Dental materials
