Evaluation of adaptation of different resins to secure implant supported over denture housings: A scanning electron microscopic study

Abstract

Eighty heat polymerized polymethyl methacrylate (PMMA) denture base specimens (30×11×8mm) were prepared. Four materials used to retain the housings in the PMMA denture base blocks were autopolymerizing acrylic resin, composite resin, pattern resin and heat polymerizing acrylic resin. The PMMA block containing housing was then seated on a ball abutment-implant analog. Universal testing machine was used to detach the acrylic block-housing assembly from the ball abutment implant analog assembly. Scanning electron images were made to inspect the PMMA denture base-retaining material-housing interfaces for any adhesive failure. Chi square test was used to compare the results of SEM analysis. Highest percentage of adhesive failure of 55% was found in the composite resin group (Group B) at the acrylic denture base-housing retaining material junction (junction 1). Heat polymerizing acrylic resin group (Group D) exhibited 100% adhesive failure at the retaining material-housing junction (junction 2).