Effect of Fluoride on the Corrosion Behavior of Ti and Ti6Al4V Dental Implants Coupled With Different Superstructures
The effect of fluoride ion concentration on the corrosion behavior of Ti and Ti6Al4V implant alloys, when coupled with either metal/ceramic or all-ceramic superstructure, was examined by different electrochemical methods in artificial saliva solutions. It was concluded that increased fluoride concentration leads to a decrease in the corrosion resistance of all tested couples. The type of the superstructure also showed a significant effect on the corrosion resistance of the couple.Abstract
Figure 1 . (a) Bode plot showing the 4 electrodes in neutral saliva without fluoride at open-circuit potential (OCP). (b) Bode plot showing the 4 electrodes in neutral saliva without fluoride after anodization. Figure 2. (a) Bode plot of the 4 electrodes in 0.1 M NaF at OCP. (b) Bode plot of the 4 electrodes at 0.1 M NaF after anodization. Figure 3. Nyquist plot of the 4 electrodes in 0.1 M NaF after anodization. __________ electrode I; - - - - - - - - electrode II; -.-.-.-.-.-.-.-.- electrode III; …………… electrode IV.
Figure 4 . Equivalent electrical circuit for study of corrosion resistance of the 4 electrodes. C1 indicates double-layer capacitance; C2, capacitance of the oxide layer; R0, electrolyte resistance; R1, the charge transfer resistance; R2, resistance of oxide layer; Zw, Warburg impedance due to diffusion in the oxide layer. Figure 5. Potential-time curves for the 4 electrodes in neutral saliva without fluoride after anodization. Figure 6. Potential-time curves for the 4 electrodes in 0.1 M NaF after anodization. Figure 7. Nyquist plot showing electrode I in different fluoride concentrations after anodization. __________ electrode I; - - - - - - - - electrode II; -.-.-.-.-.-.-.-.- electrode III; …………… electrode IV.
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