Wear and Mechanical properties of CAD/CAM resin materials

Objectives: To determine the wear and mechanical properties of CAD/CAM resin materials.

Methods: Two CAC/CAM resin blocks, LAVA Ultimate (3M ESPE) and experimental resin block (GC), and two hybrid ceramics, Estenia C&B (Kurary Noritake Dental) and Gradia Forte (GC), and one glass ceramic CAD/CAM block, Cerec blocs (Sirona) were used in this study. Three-body wear was investigated in a Leinfelder-Suzuki method (400,000 loadings, 80N at 2.0Hz). The total maximum depth and volumetric loss of the wear facets were calculated for each specimen using a profilometer. Gloss and roughness measurements were evaluated using a glossmeter and a 3D Laser scanning microscope the surface of specimens before and after toothbrushing (12,000 loadings, 2.5N at 1.0Hz). Additionally, Knoop hardness was measured, and three-point bending test was performed to determine the flexural strength, modulus of elasticity and resilience. Values were statistically compared using one-way analysis of variance (ANOVA) followed by Tukey's Honestly Significant Difference (HSD) test.

Results: Localized wear test for 400,000 cycles

For Flexural strength CAD/CAM resin materials and hybrid ceramics were significantly higher than Cerec Blocs. Knoop hardness differed significantly between Cerec Blocs and other resin materials.

Conclusions: The wear and flexural properties of the CAD/CAM resin composites suggested higher wear resistance and mechanical properties compared to hybrid ceramics.