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Mechanism of Improved Corrosion Resistance of Zn-containing Dental Amalgams

Department of Biomaterials, Louisiana State University, School of Dentistry, 1100 Florida Avenue, New Orleans, Louisiana 70119, USA

J.-R. Park

Surface Treatment Department, Research Institute of Industrial Science and Technology, P.O. Box 135, Pohang, 680, Korea

The aim of this study was to determine the mechanism of improved corrosion resistance of Zn-containing dental amalgams. Two Zn-containing conventional amalgams, their Zn-free counterparts, and three experimental amalgams (SnHg, ZnHg, and SnZnHg) were evaluated by the potentiodynamic polarization technique in 1% NaCl solution. The main difference between the two types of amalgams was found in their respective breakdown potentials at which passivity was destroyed. The breakdown potential of Zn-containing amalgams was about 200 mV more positive than that of the Zn-free amalgams. The improved stability of the Zn-containing amalgams has been attributed to the formation of a previously reported Zn stannate passive film which, according to the polarization data, is more resistant to the aggressive chloride ion than tin hydroxide that forms on Zn-free amalgams. The formation of Zn stannate was not found to affect the oxygen reduction reaction, the major cathodic reaction involved in the corrosion of dental amalgams.

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Journal of Dental Research, Vol. 67, No. 10, 1312-1315 (1988)
DOI: 10.1177/00220345880670101301


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