The effect of addition of calcium hypochlorite disinfectant on some physical and mechanical properties of dental stone

Abstract

Background: The potentially damaging effects of the immersion technique, the difficulty in covering the entire surface of the cast with the spray disinfecting solution, and the inability to assume that every impression presented to the laboratory has been disinfected has led to the need for incorporating a disinfectant directly into the calcium sulfate hemihydrate. This study was designed to evaluate the effect of the addition of Calcium Hypochorite disinfectant on some physical and mechanical properties of the dental stone. Materials and methods: Calcium Hypochlorite disinfectant in aqueous solution in different concentrations 0.5, 1.0, 1.5 and 2.0% was added to type III dental stone. Setting time, setting expansion, reproduction of details, compatibility with impression materials and consistency are physical properties which were evaluated. The compressive strength and surface hardness as mechanical properties were also determined. Results: The results of this study showed that the addition of 1 % of calcium hypochlorite improved some of the physical and mechanical properties of dental stone (Setting Expansion, Compressive Strength and Surface Hardness) while its adversely affected the other properties (Setting Time) Conclusions: The 1 % of calcium hypochlorite disinfectant solution could be used to disinfect dental cast with the least effect when compared with the other concentrations of calcium hypochlorite .