Author

Abstract

In this work galvanic corrosion potentials and currents were measured using
polarization curves of some dental alloys (amalgam, Co-Cr-Mo, Ni-Cr-Mo, SS 316L, Ti-
6Al-4V alloys) in artificial saliva containing citric acid with three concentrations 3,6 and
9 g/l at 37oC. All galvanic corrosion data were measured to coupling of amalgam and
other alloys to investigate the galvanic corrosion between filling and other dental devices
such as partial-denture framework, crowns, bridges, and endodontic instruments.
The results of galvanic corrosion show that the coupling between amalgam and Ni-
Cr-Mo alloy gives higher galvanic corrosion current than other metallic contact, and then
the contact between amalgam and Co-Cr-Mo alloy was heavier compared with coupling
of SS 316L and Ti-6Al-4V alloy with amalgam. The increasing of corrosion for alloys
containing chromium due to rapidly converting of Cr6+ to Cr3+ and this phenomenon
decreases the concentration of chromium ions at surface and then increases the
dissolution of metal atoms, while decreasing of galvanic corrosion of Ti-alloy coupled
with amalgam due to the passive oxide surface layer (TiO2).

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