A comparative evaluation of impact strength and residual monomer content in denture base resins processed by compression and injection molding technique

Objectives: This In-vitro study was designed to compare the Impact strength and Residual monomer content of conventional and high impact types of denture base resins polymerized by Compression and Injection molding technique with short curing cycle. Materials and Methods: Forty samples were made (twenty from each technique)in the dimension of 60 × 10 × 3 with 2 mm notch on the thickness side. The Impact strength was measured in Izod type of impact tester and Nuclear magnetic resonance method estimated residual monomer content. T-test and Anova were used to statistically analyze the result. Results: High Impact acrylic resin hadsignificantly high impact strength and less residual monomer content than the Conventional acrylic resin in both the techniques. Resins processed by Injection molding technique produced greater Impact strength and reduced Residual monomer content as compared to resins processed by Compression molding technique. Significance: High impact acrylic resin and injection molding technique were found to be material and technique of choice respectively for high impact strength and reduced residual monomer content.