Titanium and titanium alloys are used in dental implants and may come in contact with other dental casting alloys that are used in suprastructure restorative materials. This paper reports on the corrosion behavior of couples consisting of titanium and one of the dental casting alloys, Ni-Cr, Co-Cr, Au-Pd-Ag or Pd-Ag. Alloys and Ti were studied using materials in the cast condition. Potentiodynamic polarization techniques were used for making electrochemical measurements on the alloys and couples in artificial saliva at 37 °C. Corrosion potentials, corrosion rates and general corrosion behavior, including passivation range and breakdown potentials, were determined for all materials and couples. Results showed that the corrosion potential and protection potential of a given couple were close to the respective potentials of the less noble component. The protection potential of the Ni-Cr alloy, singly and coupled with titanium, was negative to the corrosion potential, indicating that this material could be subject to localized corrosion. Corrosion rates of all couples were increased slightly over corrosion rates of the single components.