A Comparative Evaluation of the Effect of Chemical and Ultraviolet Disinfection on Dimensional Stability of Polyvinyl Siloxane Impression Material: An in Vitro Study

Abstract

Introduction: In recent advances, ultraviolet (U.V) radiation has proved to be efcacious in killing the microorganisms. Little is known about the effect of this radiation on dimensional stability of addition silicone impression materials, hence a study was conducted to evaluate and compare the effect of U.V disinfection with chemical agents on dimensional stability of polyvinyl siloxane impression material. A total of 60 Materials And Method: samples of PVS impression material were fabricated and divided into 4 groups based on different disinfecting agents i.e. 2% glutaraldehyde, 0.5% sodium hypochlorite and U.V radiation. The impression samples were infected with S.mutans strains , incubated, after which the samples were disinfected, colonies were counted and compared with the control and different disinfectant groups. Following this, the dimensional changes in the samples were evaluated using travelling microscope. Results : Highly signicant results were seen between the number of colonies obtained from control samples and the samples subjected to chemical and U.V disinfection. Whereas in terms of dimensional stability no statistically signicant difference was observed between 2% glutaraldehyde, U.V chamber and 0.5 % sodium hypochlorite. All the disinfect Conclusion: ants tested in this study they can be successfully used for disinfection purpose of Polyvinylsiloxane impression material as they were equally efcacious and did not cause any signicant change on the dimensional stability of PVS impression material.