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VOLUME 8 , ISSUE 6 ( November-December, 2017 ) > List of Articles
Citation Information : Evaluation of Corrosive Behavior of Four Nickel–chromium Alloys in Artificial Saliva by Cyclic Polarization Test:An in vitro Study. World J Dent 2017; 8 (6):477-482.
License: CC BY-SA 4.0
Published Online: 01-12-2017
Introduction: Dental casting alloys made of high noble alloys, noble alloys, and predominantly base metal alloys have been used in the fabrication of fixed and removable prosthetic dental appliances. Nickel–chromium (NiCr) alloy has been widely used in the fabrication of fixed and removable partial denture frameworks owing to its superior physical properties and lower cost, but their resistance to tarnish and corrosion is debatable. Aim: The aim of this study is to evaluate and compare the corrosive behavior of four commercially available NiCr alloys with that of a high noble alloy. Materials and methods: Four commercially available NiCr alloys (study groups) and high noble alloy were used to study the corrosion by cyclic polarization test, and the parameters that were evaluated are corrosion potential (Ecorr), breakdown potential (Eb), repassivation potential (Ep), and corrosion current (Icorr). Results: When all the findings from the four parameters were evaluated, the values of the control group were significantly higher than the study groups, and among the four study groups, group III alloy was significantly more resistant to corrosion than the other alloy groups. Conclusion: Within the base metal alloy study groups, group III behaves to be more resistant to corrosion. Both nickel and chromium ions were released during the corrosion process, but the percentage of nickel ions was relatively higher than chromium ions. Clinical significance: With the advent of new dental alloys in the market, the biocompatibility of dental materials is of critical concern and the evaluation of corrosive behavior of new dental alloys is highly warranted. Keywords: Chromium, Corrosion, Cyclic polarization, Nickel, Noble alloy. How to cite this article: Begum R, Ariga P, Jain AR. Evaluation of Corrosive Behavior of Four Nickel–chromium Alloys in Artificial Saliva by Cyclic Polarization Test: An in vitro Study. World J Dent 2017;8(6):477-482.
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