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Influence of therapeutic dose gamma radiation and MRI on structure and mechanical properties of resin-composites dental materials

Abu Bakr El-Bediwi, Abeer A.El-Fallal, Om-Hashim Abo-El-Naga

The objective of this study was to investigate the influence of gamma radiation dose, at the therapeutic dosage, and magnetic resonance imaging (MRI) on microstructure, molecular structure and mechanical properties of Filtek Z250 and Silorane composite materials. X-ray diffraction patterns and IR spectrographs showed a change in microstructure and molecular structure of Filtek Z250 and Silorane compositematerials as a result of irradiation dose by gamma and 1.5 T MRI radiations. The experimental data showed that, Filtek Z250 composite material is much harder before irradiated and more affected by gamma radiation dose than that silorane composite material. But the effects ofMRI (1.5 T) on both composite materials are nearly the same. The bending strength and breaking load values of Filtek Z250 and Silorane composite materials are decreased by increasing gamma radiation dose but its increased by exposure to MRI (1.5 T) radiation.