Transverse Strength of Repaired Denture Base Material with Wire and Two Auto Polymerized Acrylic Resin

Received: 15 October 2006 Accepted: 16 May 2007 Abstract: Objective: The purpose of this study was to evaluate the transverse strength of one brand of denture base material repaired with two autopolymerized acrylic resins with and without wire reinforcement. Materials and Methods: Eighty samples (2.5×10×65 mm) were fabricated and divided into five groups. The control group was left intact. Groups B and D specimens were repaired with autopolymerizing acrylic resins. Groups A and C specimens were repaired with metal wire and autopolymerizing acrylic resins. After 48 hours of storage at 37°C, the transverse strength of the specimens was measured with a universal testing machine. Data were analyzed by one way ANOVA and Duncan test (α=0.05). Results: Significant differences were found between the control group and the other experimental groups (P<0.05). Among experimental groups, group D showed the highest transverse strength with the mean value of 40.2 (SD=11.8) MPa while group B present the lowest transverse strength of 28.4 (SD=5.4) MPa. The difference between the transverse strength of group D and the other groups was statistically significant (P<0.05). Conclusion: In wire reinforced groups, there was no significant difference between two types of acrylic resin (P=0.93), however in repaired groups without wire, the type of acrylic resin generates a significant difference in the transverse strength of the repaired specimens (P<0.05). The application of wire significantly reduces the transverse strength of the Meliodent repaired groups (P<0.05), however the changes occurred in transverse strength of the Acropars repaired groups was not statistically significant (P=0.28).