Abstract
ABSTRACT In the restoration of lost or damaged dental pieces, different alloys are frequently used, leaving the mouth exposed to electrical currents that circulate through saliva and dental fluids. In the present work, electrochemical methods are used to determine the corrosion rate of galvanic pairs of a high copper silver amalgam with Co-Cr dental alloys in artificial saliva. It is observed that when the difference in corrosion potentials of dissimilar alloys are small (less than 100 mVecs), Evans diagrams do not give good results, so the Mansfeld correction formulas must be used. Thus, it is found that the most resistant to corrosion is the pair formed between the amalgam and the bulk Co-Cr alloy (PG1,3) and that the corrosion products released in greater quantity to the electrolyte are those that contain ions of Co, Cr, Ag, Sr and Cu.
Highlights
Dental alloys for melting and casting are available in the market in a wide variety of compositions and mechanical properties that depend on their subsequent application
In this work we have studied the corrosion of galvanic pairs of Co-Cr alloys with high copper silver amalgam in artificial saliva using the Evans method, the Mansfeld correction formulas and we have analyzed by EDAX the corrosion products in the cavity oral simulation
The alloys of Co - Cr are ordered according to their corrosion potential, forming an electrochemical series in aerated artificial saliva
Summary
Dental alloys for melting and casting are available in the market in a wide variety of compositions and mechanical properties that depend on their subsequent application (crowns, bridges, inlays, etc.). The most traditional are the noble alloys that contain not less than 75% of gold and metals of the platinum group. These alloys do not suffer deterioration of their properties over time or lose their aesthetic appearance. They have high density, low elastic modulus and are excessively expensive [1-4].
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