Abstract
Enamel and dentin are materials of complex structure. To replace the lost part of a functionally damaged tooth requires materials which have similar esthetics and physicochemical properties. The elastic properties of the materials are considered to be especially important in this regard. In the present study, the elastic properties of a pure dental resin and two glass-reinforced resin dental composites have been measured using ultrasonic propagation techniques. The ultrasonic pulse-through transmission method was used to measure both shear and longitudinal (dilatational) velocities. Density was measured using a buoyant force method. The Young's, shear and bulk moduli and Poisson's ratio were determined. The materials studied had Young's moduli of the order of 5–20 GPa. The use of a chemical coupling agent apparently did not significantly affect the elastic properties of these resin-based composites.
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