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Effect of different chemical disinfectants on the flexural strength of heat-polymerized acrylic resins.

The European journal of prosthodontics and restorative dentistry (2013-11-23)
O Savabi, K Attar, F Nejatidanesh, H Goroohi, H Badrian
ABSTRACT

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 (65x10x3 mm) 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 degrees 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 5 mm/min. Data were subjected to 2-way ANOVA and Tukey HSD (alpha=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.

MATERIALS
Product Number
Brand
Product Description

Supelco
Poly(methyl methacrylate), analytical standard, for GPC, average Mw 97,000 (Typical), average Mn 46,000 (Typical)
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 50,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 10,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 100,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 2,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 20,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 8,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 2,480,000
Sigma-Aldrich
Poly(methyl methacrylate)
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 4,000
Sigma-Aldrich
Poly(methyl methacrylate), average Mw ~350,000 by GPC
Sigma-Aldrich
Poly(methyl methacrylate)
Sigma-Aldrich
Poly(methyl methacrylate), average Mw ~15,000 by GPC, powder