Effect of Denture Cleansers on Tensile Bond Strength of Soft Liners to Denture Base Resin

بررسي اثر محلولهاي تميزكننده بر مقاومت باند كششي لايه هاي نرم به بيس پروتز

Abstract Background and Aim: Optimal bond strength between soft liners and denture base resin is an important requirement for application of these materials. This study aimed to deter-mine the effect of 2.5% sodium hypochlorite (NaOCl) and Corega denture cleanser solu-tions on tensile bond strength of Acropars, Molloplast-B, GC soft liner and Mollosil soft liners to denture base resin. Materials and Methods: In this in-vitro experimental study, 30 specimens of each of the 4 soft liners according to the manufacturer’s instructions were processed between two blocks of polymethyl methacrylate. Specimens were divided into 3 groups and after im-mersion in 2.5% sodium hypochlorite and Corega solutions were subjected to tensile bond strength testing using Universal Testing Machine (Zwick Roell, Z50, Germany) with a crosshead speed of 5 mm/min. Data were analyzed with two-way ANOVA, Tamhane’s post hoc test and Fisher’s exact test. Results: The mean tensile bond strength of all three testing positions was 3.27? 1.04, 0.93?0.35, 0.71?0.31 and 0.28 ?0.11 MPa for Acropars, Molloplast-B, GC soft liner and Mollosil, respectively. Type of soft liner material had a significant effect on the tensile bond strength of soft liner to denture base resin (P < 0.0001) but type of cleansing solution had no significant influence on tensile bond strength of specimens. Conclusion: The 2.5% sodium hypochlorite and Corega solutions had no significant effect on tensile bond strength of soft liners to denture base. Key Words: Cleansing solutions , tensile strength , acrylic resins , denture liners