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SEM micrographs after adhesion of A. actinomycetemcomitans, T. forsythia, and C. rectus on the surface of (a) Group TiO2: as-annealed TiO2 nanotubes; (b) Group Ag: as-annealed Ag doped TiO2 nanotubes; (c) Group Ti: commercially pure Ti sheet.
