Objective: The galvanic corrosion behavior of dental amalgam coupled to three types of dental alloys in common use(pure Ti?Ni-Cr alloy and Co-Cr alloy)

was investigated in artificial saliva.Methods: An electrochemical method was used in the measurement of corrosion potential(Ecorr)?polarization resistance(Rp) and corrosion current density(Icorr) of four types of alloys

and current density of three galvanic couples.These electrochemical parameters were analyzed statistically.Results: The corrosion potential

polarization resistance and corrosion current density

respectively

were statistically different among the different alloys(P<0.01)

and the current density of three couples was different respectively(P<0.01).Conclusion: The pure titanium exhibits the best corrosion resistant.Coupling to dental amalgam

pure titanium is the best choice

and Ni-Cr alloys is the worse.