Fig. 2. Observation of VITA surfaces: (A, C, E): top surfaces of sandblasted CAD/CAM blocks; (B, D, F): cross-sectional view; the specimens were sandblasted for 15 seconds, 30 seconds, and 60 seconds. The top surface figures show a rough surface for VITA CAD/CAM blocks after sandblasting. Irregularities and deep holes are present on the surface of VITA samples that were sandblasted for 30 seconds and 60 seconds.
