The Effect of Simulated Chewing on the Surface Roughness of Direct and Indirect Resin-Composites Opposed by Zirconia: An In Vitro Study

Table 1

The composition and manufacturer details of the tested materials.

	Trade name	Type	Composition	Batch number/shade	Manufacturer
Tested resin-composite materials	Tetric EvoCeram	Nanohybrid, direct resin-composite	The matrix is 17–18 wt% dimethacrylate resin. Fillers contain barium glass, ytterbium trifluoride, mixed oxides, and prepolymer (82–83 wt%). The mean filler particle size is <550 nm.	590313/shade A2	Ivoclar Vivadent limited, Enderby, Leicester, UK
	Sinfony	Microhybrid, indirect lab resin-composite	The matrix comprises 48 wt% mixture of aliphatic and cycloaliphatic monomers. Fillers: 40 wt% strontium aluminium borosilicate glass of mean particle diameter 0.5–0.7 μm as macrofiller and 5 wt% pyrogenic silica as microfiller.	049310/shade E2	3M ESPE AG, Seefeld, Germany
The antagonist zirconia ceramic	Lava plus	Second generation high translucency zirconia	3 mol% yttria partially stabilized tetragonal zirconia polycrystal (<15% cubic phase in zirconia, ≤0.5% Al2O3).	357797/shade A3	3M ESPE, St Paul, MN, USA