Effect of the Composition of CADCAM Composite Blocks on Mechanical Properties

الملخص EN

The aim of this study was to evaluate the effect of the composition of CAD/CAM blocks on their mechanical properties.

Nine different CAD/CAM blocks, enamel and dentine, were tested.

Sixteen samples of each material were separated for Vickers microhardness test (n=6, 5 readings per specimen), nanohardness test (n=6, 5 readings per specimen), filler weight (n=3), and SEM imaging (n=1).

Data were statistically analysed using one-way ANOVA.

Vita Mark II ceramic showed significantly higher values of hardness (in both nano- and microscale) and elastic modulus (6.83 GPa, 502 kg/mm2, and 47.7 GPa), respectively, than other materials.

CAD/CAM composite blocks showed comparable values of hardness and elastic modulus to those of dentine but lower than those of enamel and ceramics.

SEM images highlighted different filler-matrix microstructure of CAD/CAM composite blocks.

It was concluded that (1) hardness and elastic moduli are positively correlated with ceramic filler percentage and microstructure and (2) CAD/CAM composite materials have comparable hardness and elastic moduli to tooth structure.