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Mixed-phase TiO 2  nanocomposite thin films consisting of anatase and rutile prepared on commercially pure Ti sheets via the electrochemical anodization and annealing treatments were investigated in terms of their photocatalytic activity for antibacterial use around dental implants. The resulting films were characterized by scanning electron microscopy (SEM), and X-ray diffraction (XRD). The topology was assessed by White Light Optical Profiling (WLOP) in the Vertical Scanning Interferometer (VSI) mode. Representative height descriptive parameters of roughness  R    a   and  R    z   were calculated. The photocatalytic activity of the resulting TiO 2  films was evaluated by the photodegradation of Rhodamine B (RhB) dye solution. The antibacterial ability of the photocatalyst was examined by   Aggregatibacter actinomycetemcomitans  suspensions in a colony-forming assay. XRD showed that anatase/rutile mixed-phase TiO 2  thin films were predominantly in anatase and rutile that were 54.6 wt% and 41.9 wt%, respectively. Craters (2–5  µ m) and protruding hills (10–50  µ m) on Ti substrates were produced after electrochemical anodization with higher  R    a   and  R    z   surface roughness values. Anatase/rutile mixed-phase TiO 2  thin films showed 26% photocatalytic decolorization toward RhB dye solution. The number of colonizing bacteria on anatase/rutile mixed-phase TiO 2  thin films was decreased significantly  in vitro . The photocatalyst was effective against  A. actinomycetemcomitans  colonization.

Photocatalytical Antibacterial Activity of Mixed-Phase TiO2Nanocomposite Thin Films againstAggregatibacter actinomycetemcomitans

Photocatalytical Antibacterial Activity of Mixed-Phase TiO₂Nanocomposite Thin Films againstAggregatibacter actinomycetemcomitans