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Photocatalytical Antibacterial Activity of Mixed-Phase TiO2 Nanocomposite Thin Films against Aggregatibacter actinomycetemcomitans.

Yeniyol S, Mutlu I, He Z, Yüksel B, Boylan RJ, Ürgen M, Karabuda ZC, Basegmez C, Ricci JL - Biomed Res Int (2015)

Bottom Line: The resulting films were characterized by scanning electron microscopy (SEM), and X-ray diffraction (XRD).The photocatalytic activity of the resulting TiO2 films was evaluated by the photodegradation of Rhodamine B (RhB) dye solution.The photocatalyst was effective against A. actinomycetemcomitans colonization.

View Article: PubMed Central - PubMed

Affiliation: Department of Oral Implantology, Faculty of Dentistry, Istanbul University, 34093 Istanbul, Turkey.

ABSTRACT
Mixed-phase TiO2 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 TiO2 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 TiO2 thin films were predominantly in anatase and rutile that were 54.6 wt% and 41.9 wt%, respectively. Craters (2-5 µm) and protruding hills (10-50 µm) on Ti substrates were produced after electrochemical anodization with higher R a and R z surface roughness values. Anatase/rutile mixed-phase TiO2 thin films showed 26% photocatalytic decolorization toward RhB dye solution. The number of colonizing bacteria on anatase/rutile mixed-phase TiO2 thin films was decreased significantly in vitro. The photocatalyst was effective against A. actinomycetemcomitans colonization.

No MeSH data available.


Representative top-view SEM micrographs of the (a) Group Ti, and (b) Group AR.
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fig5: Representative top-view SEM micrographs of the (a) Group Ti, and (b) Group AR.

Mentions: Figure 5 shows surface SEM images of sheets of cpTi (Group Ti) and the mixed-phase TiO2 thin film photocatalyst (Group AR). It is observed that cpTi surface has a flat texture and showed relatively a smooth appearance. The surface morphology of the photocatalyst was affected by the electrochemical anodization. Craters (2–5 μm) and protruding hills (10–50 μm) were observed in Group AR anodized in the KOH electrolyte, conferring a more pronounced increase of surface roughness compared to cpTi sheets in Group Ti.


Photocatalytical Antibacterial Activity of Mixed-Phase TiO2 Nanocomposite Thin Films against Aggregatibacter actinomycetemcomitans.

Yeniyol S, Mutlu I, He Z, Yüksel B, Boylan RJ, Ürgen M, Karabuda ZC, Basegmez C, Ricci JL - Biomed Res Int (2015)

Representative top-view SEM micrographs of the (a) Group Ti, and (b) Group AR.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4631860&req=5

fig5: Representative top-view SEM micrographs of the (a) Group Ti, and (b) Group AR.
Mentions: Figure 5 shows surface SEM images of sheets of cpTi (Group Ti) and the mixed-phase TiO2 thin film photocatalyst (Group AR). It is observed that cpTi surface has a flat texture and showed relatively a smooth appearance. The surface morphology of the photocatalyst was affected by the electrochemical anodization. Craters (2–5 μm) and protruding hills (10–50 μm) were observed in Group AR anodized in the KOH electrolyte, conferring a more pronounced increase of surface roughness compared to cpTi sheets in Group Ti.

Bottom Line: The resulting films were characterized by scanning electron microscopy (SEM), and X-ray diffraction (XRD).The photocatalytic activity of the resulting TiO2 films was evaluated by the photodegradation of Rhodamine B (RhB) dye solution.The photocatalyst was effective against A. actinomycetemcomitans colonization.

View Article: PubMed Central - PubMed

Affiliation: Department of Oral Implantology, Faculty of Dentistry, Istanbul University, 34093 Istanbul, Turkey.

ABSTRACT
Mixed-phase TiO2 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 TiO2 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 TiO2 thin films were predominantly in anatase and rutile that were 54.6 wt% and 41.9 wt%, respectively. Craters (2-5 µm) and protruding hills (10-50 µm) on Ti substrates were produced after electrochemical anodization with higher R a and R z surface roughness values. Anatase/rutile mixed-phase TiO2 thin films showed 26% photocatalytic decolorization toward RhB dye solution. The number of colonizing bacteria on anatase/rutile mixed-phase TiO2 thin films was decreased significantly in vitro. The photocatalyst was effective against A. actinomycetemcomitans colonization.

No MeSH data available.