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Comparison of cell survival rates of HGFs cultured on five discs with different modified surfaces for 1, 3, 5 and 7 days before and after mechanical force application using ultrasonic waves. Results are shown as the mean number of cells from four wells ±SD. Ctrl: control, MT: machined titanium surface, PT: polished titanium surface, CT: titanium coated with titanium nitride, MC: machined ceramic surface, PC: polished ceramic surface.
