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.
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