- 期刊
Corrosion Behavior of titanium-containing Orthodontic Archwires in Artificial Saliva: Effects of Fluoride Ions and Plasma Immersion Ion Implantation Treatment
並列摘要
The aim of this study was to investigate the effects of fluoride ion concentration and plasma immersion ion implantation (PⅢ) treatment on the corrosion behavior of different titanium (Ti)-containing dental orthodontic archwires (including Ni-Ti, Ni-Ti-Cu, Ti-Mo-Zr-Sn, and Ti-Nb alloys) using cyclic potentiodynamic polarization curve measurements in acidic artificial saliva. Different NaP concentrations (of 0%, 0.2%, and 0.5%), simulating the fluoride contents in commercial toothpastes, were added to the artificial saliva. The PⅢ surface treatment was carried out in a mixed Ar/N2 environment with an implantation density of 5×10^17 ions/cm^2. Surface characterization was analyzed using x-ray photoelectron spectrometry. Cyclic potentiodynamic polarization curves showed that the presence of fluoride ions destroyed the protective ability of the TiO2 film on the Ti-containing archwires, thus significantly decreasing the corrosion resistance of the tested alloys. Among the tested Ti-containing archwires, the Ni-Ti and Ni-Ti-Cu archwires were more susceptible to fluoride-enhanced corrosion, while the Ti-Nb archwire showed the lowest susceptibility. Furthermore, the PⅢ surface treatment improved the corrosion resistance of the tested Ti-containing archwires in acidic artificial saliva, by decreasing the corrosion rate and anodic current density.
延伸閱讀
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