Corrosion-Resistance, Antibacterial-Properties Of Composite Tio2 Coating Arch-Wires

To study the corrosion resistance and antibacterial properties of CAWs can be significantly improved by coating with the TiO2 nanocrystal thin film, which is extremely important for their clinical application. The antibacterial activity was also studied by potentiodynamic polarization curves and EIS. Streptococcus mutans culture in the samples' extract was studied to evaluate the antibacterial properties of the samples The results revealed that N-doped TiO2 coated CAWs can prolong the wearing time and improve the security of the arch wire in the oral cavity. It was found that the CAWs coated with N-doped TiO2 showed the highest antibacterial activity. In summary, TiO2 and N-doped TiO2 nanocrystal thin films were deposited on the surface of CAW by RF magnetron sputtering method. The morphologies and structures of the coated materials were systematically characterized and their corrosion resistance in artificial saliva was electrochemically assessed. As expected, the TiO2 and N-TiO2 coated CAWs can greatly improve the corrosion resistance of pristine CAW in artificial saliva. It was demonstrated that N-doped TiO2 film showed much better anticorrosion ability than TiO2 film. Additionally, the antibacterial experiments confirmed that N-doped TiO2 group exhibited higher antibacterial activity against Streptococcus mutans with a rate of 87.2% under visible light irradiation. Therefore, the N-doped TiO2 coating can improve corrosion resistance and antibacterial properties of CAW obviously. The results of the cytotoxicity test demonstrated that N-doped TiO2 coated CAW has a high potential in the practical dental treatments.