Effect of Curing Time on the Flexural Strength of Heat Cured Acrylic Resin

Abstract

Objectives: The aim of this study was to find out the proper curing time and flexural strength of heat cured acrylic resin cured in boiling water at 100°c with time difference and to compare the maximum flexural strength in optimum time. Methods: In this study, 60 heat cured acrylic resin samples were processed with compression moulding technique at 100°c among which each of 20 samples were cured for 20, 40 and 60 minutes separately. Flexural strength of samples was determined by using 3 point bending test by universal testing machine. Data was analyzed using ANOVA test and unpaired t-test. Results: The ANOVA result showed that there was no significant differences among the groups with respect to the mean flexural strength (P>0.05) and unpaired t-test also showed no significant differences among the groups. The mean flexural strength of acrylic resin cured at 100°c with compression moulding technique at 100°c at 20 minutes was 80.09±14.58 MPa, at 40 minutes was 79.71±13.1 MPa and at 60 minutes was 80.76±15.75 MPa. Conclusion: The flexural strength of heat cured acrylic denture base resin cured at 100°c for different period of time (at 20, 40 & 60 minutes) have given no significant differences. DOI: http://dx.doi.org/10.3329/cdcj.v9i2.12316 City Dental College J. Volume-9, Number-2, July-2012