Abstrait

An in-vitro study of the effect of magnetic resonance imaging on physico-mechanical and structure of dental ceramic restorations

Abu Bakr El-Bediwi, Thoraya El-Helaly, Amal Sakrana, Mustafa Kamal

Magnetic Resonance Imaging (MRI) scan is a painless radiology technique without no known side effects and its precise accuracy in detecting structural abnormalities of the body. MRI is also best suited for cases when a patient is to undergo the exam several times successively in the short term, because, unlike CT, it does not expose the patient to the hazards of ionizing radiation. In the present study the effect of MRI on microstructure, hardness and minimum shear stress of Porcelain and Zirconia Dental Ceramic have been studied and analyzed. Vickers hardness and minimum shear strength values of Zirconia and porcelain decreased but crack velocity and crack length increased after exposure to MRI. The interaction of non-ionizing radio frequency (RF) signals of MRI with Ceramic materials caused a structure change which effects on physico mechanical properties.