Abstract
It has been demonstrated that Ag-TiO2 nanocomposite coatings with excellent antimicrobial activity and biocompatibility have the potential to reduce infection problems. However, the mechanism of the synergistic effect of Ag-TiO2 coatings on antibacterial efficiency is still not well understood. In this study, five types of Ag-TiO2 nanocomposited coatings with different TiO2 contents were prepared on a titanium substratum. Leaching tests indicated that the incorporation of TiO2 nanoparticles into an Ag matrix significantly promoted Ag ion release. Surface energy measurements showed that the addition of TiO2 nanoparticles also significantly increased the electron donor surface energy of the coatings. Bacterial adhesion assays with Escherichia coli and Staphylococcus aureus demonstrated that the number of adhered bacteria decreased with increasing electron donor surface energy. The increased Ag ion release rate and the increased electron donor surface energy contributed to an enhanced antibacterial efficiency of the coatings.
Highlights
Titanium (Ti) and its alloys are widely used in both orthopedic and dental implants (Jia et al 2016)
Bacterial adhesion assays with Escherichia coli and Staphylococcus aureus demonstrated that the number of adhered bacteria decreased with increasing electron donor surface energy
The TiO2 coatings (TiO2) particles were homogenously incorporated in the Ag matrix
Summary
Titanium (Ti) and its alloys are widely used in both orthopedic and dental implants (Jia et al 2016). TiO2 with moderate hardness and excellent resistance to wear and corrosion can significantly accelerate osteoblast cell growth and improve bone-forming functionality and direct the fate of stem cells in orthopedic-associated implants (Frandsen et al 2013; Li et al 2015). This suggests that a Ag-TiO2 nanocomposite coating may offer a promising solution for improvement of the antibacterial properties of dental and orthopedic implants (Cotolan et al 2016; Gyorgyey et al 2016). A range of novel Ag-TiO2 nanocomposite coatings with different TiO2 content on a titanium substratum were prepared using an electroless plating technique, and the antibacterial
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