Effect of Different Chemical Disinfectants on the Flexural Strength of Heat-Polymerized Acrylic Resins

摘要

The purpose of this study was to evaluate the effect of chemical disinfectants on flexural strength of denture base acrylic resins. A total of 176 rectangular specimens (65x10x3mm) were made from four heat-polymerized acrylic resins (Triplex, QC-20, Meliodent and Acropars)(n-44). The specimens were thermal cycled for 5000 cycles 5-55° C and randomly divided into four groups (n-11). The specimens were immersed in 1 % sodium hypochlorite, 2% glutaraldehyde, 10% Micro 10 or water for 30 minutes. The flexural strength was evaluated using a universal testing machine at a crosshead speed of 5mm/min. Data were subjected to 2-way ANOVA and Tukey HSD (a=0.05). The highest flexural strengths of denture base resins were achieved after immersion in water (Triplex =128.9+- 12.8, QC-20=125+- 11.8, Meliodent=96.2+- 11.4 and Acropars=78.1+-12.3 MPa). Triplex and QC-20 showed the highest flexural strengths in all of the solutions (P<0.05). The flexural strength of denture base acrylic resins was significantly affected by immersion in disinfection solutions but the reduction in flexural strengths of Triplex, QC-20 and Meliodent after disinfection by %1 sodium hypochlorite, %2 glutaraldhyde and Micro 10 were clinically insignificant.