Titanium has been widely used as dental materials because of its good corrosion resistance and biocompatibility. The dental gels and rinse for caries prophylactic contain fluoride from 0.1% to 1% concentration. The purpose of the study is to investigate the addition effect of fluoride into artificial saliva on corrosion resistance of titanium and titanium-silver alloys. Titanium and titanium-silver alloys were arc-melted, homogenized at 950°C for 72 hours, hot-rolled, and solution heat-treated and quenched. To investigate the effect of the fluoride ions on the corrosion resistance, potentiodynamic polarization testing, potentiostatic testing and open circuit potential measurement were performed in the 0.1% and 1% NaF added artificial saliva. Passive current densities of titanium and titanium-silver alloys increased with NaF concentration. Titanium-silver alloys had higher corrosion resistance than titanium in the high NaF concentration. With increased fluoride concentration, the open circuit potential of titanium reacted sensitively and decreased but that of titanium-silver alloys with high silver content showed less sensitive changes to fluoride ion concentration. Titanium-silver alloys had higher resistance against the aggressive attack of fluoride ion and more stable open circuit potential than titanium in fluoride containing solution. Therefore, it is concluded that they can be adopted in the dental fields cautiously.
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