The effects of disinfectant solutions on the viscoelastic properties of acrylic resins

Abstract

Objectives: The aim of this paper was to analysis the effects of disinfectant solutions onpolyoxymethylene viscoelastic properties in comparison with polymethyl methacrylate. Materials and Methods: Polymethyl methacrylate and polyoxymethylene acrylic and 200 mL5% chlorhexidine gluconate, 2% sodium hypochlorite and one Corega Tabs dissolved in 200 mLwater at 40°C were used. The storage modulus, loss modulus, Tanδ and glass transitiontemperatures of the disinfected acrylic resins were observed with the Thermal DynamicMechanical Analyzer. Results: Lower storage modulus values were observed in the disinfectant solutions atpolymethyl methacrylate specimens. The storage modulus showed lower values than thecontrol group at chlorhexidine gluconate, higher values at sodium hypochlorite in thedisinfectant solutions at polyoxymethylene specimens. While the glass transition temperaturesof polymethyl methacrylate in the disinfectant solutions showed proximal values, the glasstransition temperatures of polyoxymethylene in the chlorhexidine gluconate showed lowertemperatures (approximately 11%). Conclusions: The storage modulus, loss modulus, Tanδ values of polyoxymethylene werelower than those of Polymethyl methacrylate. The Corega Tabs did not affect the viscoelasticproperties of polyoxymethylene. Chlorhexidine gluconate and sodium hypochlorite did notaffect the viscoelastic properties of polymethyl methacrylate.