Title: Assessment of porosity of glass-ionomer cement using ultrasonic waves

Authors: Touriya Bassidi; Lahcen Mountassir; Hassan Nounah; Khalid Bouabid

Addresses: Laboratory of Metrology and Information Processing, Faculty of Sciences, Department of Physics, Ibn Zohr University, B.P 8106 Agadir, Morocco ' Laboratory of Metrology and Information Processing, Faculty of Sciences, Department of Physics, Ibn Zohr University, B.P 8106 Agadir, Morocco ' Laboratory of Metrology and Information Processing, Faculty of Sciences, Department of Physics, Ibn Zohr University, B.P 8106 Agadir, Morocco ' Laboratory of Metrology and Information Processing, Faculty of Sciences, Department of Physics, Ibn Zohr University, B.P 8106 Agadir, Morocco

Abstract: The degradation of dental restoration with glass ionomer cement is generally caused by the penetration of aggressive agents through the pores. Therefore the porosity is an essential parameter in the degradation process and an indicator of the durability of this restoration. The objective of this study was to investigate the relationship between porosity and ultrasonic parameters of glass-ionomer dental cement. Theoretical Schoch model describing the ultrasonic propagation in materials was proposed. Ultrasonic velocities and mechanical properties were evaluated. They were then, compared to the experimental ultrasonic parameters measured on dry and saturated samples with varying porosity. As expected, a linear decrease of ultrasonic velocities vs. porosity is observed for two saturation states. The correlation between theoretical and measured results is analysed. The Schoch model succeeded in describing the acoustic parameters in dry and saturated state.

Keywords: glass-ionomer cement; ultrasound; porosity; mechanical properties.

DOI: 10.1504/IJMMP.2017.092170

International Journal of Microstructure and Materials Properties, 2017 Vol.12 No.5/6, pp.446 - 458

Available online: 25 May 2018 *

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