Electron beam irradiation effect on flexural strength and modulus of elasticity of resin modified glass ionomer luting agent

Authors:Mithra N Hegde, Shabin.S, Nidarsh D Hegde, Suchetha Kumari, Ganesh Sanjeev, Shilpa Shetty
Int J Biol Med Res. 2013; 4(4): 3690-3694  |  PDF File

Abstract

Aims: The purpose of the study is to analyse the changes in flexural strength and modulus of elasticity of resin modified glass ionomer luting agents before and after electron beam irradiation. Methods: A total of two resin modified glass ionomer luting agents, rely X luting cement and rely X luting 2 cement were included in the study. Specimens were prepared on rectangular bar shaped specimen (2󫎾5mm) according to ISO standard 4049. After the standardization of radiation dose of 200GY , a total of 24 specimens were irradiated and 24 specimens of non irradiated were checked for flexural strength and modulus of elasticity using universal uniaxial servo mechanical testing machine at 24 hours. Results: Rely x luting cement of irradiated samples shows an increase in the flexural strength and modulus of elasticity compared to non radiated samples whereas rely x luting 2 cement shows a slight increase for non radiated samples. Conclusion: Increase in the flexural strength and modulus of elasticity of rely x luting agent radiated samples may be because of cross linking of unbound monomers and decreased properties of radiated rely x luting 2 agent may be due to chain scissioning.