A COMPARATIVE EVALUATION OF SHEAR BOND STRENGTH BETWEEN TREATED DENTURE BASE AND REPAIR RESIN: AN IN VITRO STUDY

*Dr. Samarth Kumar Agarwal, Dr. Praveen G., Dr. Romil Singhal, 4Dr. Kuldeep Singh, Dr. Beenish Javed, Dr. Kumari Kalpana

ABSTRACT

Statement of Problem: Fracture of denture made with acrylic resin is frequent due to various reasons. Therefore, the purpose of the present study is to investigate the effect of various chemicals on shear bond strength between heat cure denture base and repair resin. Materials and Method: Seventy five samples of the heat cure denture base acrylic resin were fabricated. All samples were cleaned ultrasonically and were stored in water for seven days. The samples were roughened with acrylic trimmer and silicon carbide paper. In control group 15 samples were taken with no chemical treatment and the remaining 60 samples in experimental groups were treated with methyl methacrylate, chloroform, acetone and methylene chloride for 30 seconds respectively. Autopolymerizing repair resin was used for repair. Polymerization was done in the pressure pot under 52 psi pressure at 37 C for 10 minute. Shear bond strength test for all the samples was performed with a universal testing machine at 1.25mm/min speed using wooden jig. Result: Mechanical and chemical treatment of heat cure denture base increased the shear bond strength between heat cure resin and repair resin. ANOVA showed significant p value (p<0.001), student “t” test was also significant. Conclusion: Mechanical and Chemical treatment of heat cure denture base showed increase in shear bond strength remarkably with all tested materials.

Keywords: Denture base, Shear bond strength, Fracture, repair resin.