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Characteristic SEM images for the samples No. 1–6 after adhesion and spreading of the human osteoblasts MG-63: (1) polished coarse grained titanium; (2) polished nanotitanium; (3) nanotitanium etched in NH4OH/H2O2-15 min; (4) nanotitanium etched in NH4OH/H2O2-15 min and TiO2 coated by ALD; (5) nanotitanium etched in H2SO4/H2O2-15 min; and (6) nanotitanium etched in H2SO4/H2O2-15 min and TiO2 coated by ALD.
