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Cell proliferation on the sample surfaces at different time points assessed via CCK-8 assay. (a) cell proliferation (OD value at 492 nm wavelength); (b) relative proliferation on the 3rd and 5th day, normalized by the values on the 1st day. U: untreated group; P: polished group; GB (50): 50 µm grit-blasted group; GB (120): 120 µm grit-blasted group; GB (250): 250 µm grit-blasted group.
