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(a) Representative scanning electron microscope (SEM) images of the intact surfaces of the tested CAD/CAM materials. (b) Representative SEM images of the surfaces of the tested CAD/CAM materials after sandblasting with 29 μm Al2O3 particles. (c) Representative SEM images of the surfaces of the tested CAD/CAM materials after HF + Si treatment. (d) Representative SEM images of the surfaces of the tested CAD/CAM materials after sandblasting with the CoJet system.
