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Electrochemical investigations regarding the bioavailability of silver after potentiodynamic corrosion load of precious metal alloys Part 2: Dental alloys
Author(s) -
Hildebrand G.,
Liefeith K.
Publication year - 1998
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/(sici)1521-4176(199810)49:10<736::aid-maco736>3.0.co;2-h
Subject(s) - corrosion , electrochemistry , metallurgy , dissolution , electrolyte , materials science , metal , crevice corrosion , chemistry , nuclear chemistry , electrode
Abstract The spectrum of commercial dental alloys has been essentially expanded during the last years. The toxicological effects of dental alloys depend mainly on their element specific corrosion behaviour in the oral cavity. The present study demonstrates the electrochemical boundary conditions regarding the possible formation of AgCl‐corrosion products, for which cytotoxic effects has been established, by means of specially adapted electrochemical in‐vitro test programs. The prevalence of the developed corrosion mode was proved for two electrolytes and four daily used dental alloys containing different amounts of silver. The results show, that a biological relevant assessment of the released silver ions in both electrolytes, induced by anodic metal dissolution, is only reliable if the measurement takes into account the silver ions within the electrolyte as well as the superficial immobilized amount of silver chloride corrosion products. Thus especially from a biological point of view, interface processes like the formation of immobilized corrosion products seem to be a relevant parameter for the complete testing of biocompatibility of metallic biomaterials. To sum up it can be concluded, that the dental alloys investigated in the course of this study have not shown any adverse susceptibility to corrosion with respect to the clinical practice and can therefore be classified as well biocompatible.