Dental Materials Journal
Online ISSN : 1881-1361
Print ISSN : 0287-4547
ISSN-L : 0287-4547
In Vitro Corrosion of Dental Ag-based Alloys in Polyvinylpyrrolidone Iodine Solution
Morio OCHIKazuhiko ENDOHiroki OHNONorio TAKASUSUKIHideki MATSUBARATakeo MAIDA
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2005 Volume 24 Issue 3 Pages 422-427

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Abstract
The corrosion and tarnish behaviors of three Ag-based alloys (Ag-Pd-Cu-Au alloy, Ag-In alloy, and Ag-Sn-Zn alloy) in polyvinylpyrrolidone iodine (povidone-iodine) solution were examined. The degree of tarnish was evaluated by visible-ray spectrocolorimetry. Corrosion potential measurements and analyses of corrosion products by X-ray diffractometry were carried out to elucidate the corrosion mechanism. The corrosion rate of the three Ag-based alloys in povidone-iodine solution at its practical concentration used as a gargle solution was so fast that the alloys tarnished within 10 seconds of immersion with the formation of AgI. Thermodynamic consideration and the results of surface analysis by X-ray diffractometry revealed that the main anodic and catholic reactions were Ag+I-→AgI+e- and I2+2e-→2I- respectively.
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© The Japanese Society for Dental Materials and Devices
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