Effect of different storage media on the microhardness and wear resistance of resin‐matrix ceramics

This in vitro study evaluated the microhardness and two‐body wear of various computer‐assisted design and computer‐assisted manufacturing (CAD/CAM) resin‐matrix ceramic materials stored in different storage media. For each material (Paradigm MZ100, Lava Ultimate, Vita Enamic, and Cerasmart), 40 disk‐shaped specimens (8 mm diameter × 3 mm thickness) were prepared and divided into four subgroups (n = 10) according to storage material (artificial saliva, distilled water, 0.02 mol/L citric acid, 3:1 ethanol/water). Following storage at 37°C for 7 days, microhardness was measured with a Knoop test, and wear was measured using a 3D scanner and surface analysis program before and after loading on a chewing simulator (200 000 cycles). Wear values of Vita Enamic were lower in comparison to the other materials tested ( P  < 0.001). Storage media were found to have a significant effect on material microhardness ( P  < 0.001), but not on wear ( P  = 0.820).