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Journal of Dental Research
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Corrosion of Ferromagnetic Alloys used for Magnetic Retention of Overdentures

M.M.A. Vrijhoef

Biomaterials, University of Nijmegen Dental School, Philips van Leydenlaan 25, 6500 HB Nijmegen, The Netherlands

P.R. Mezger

Biomaterials, University of Nijmegen Dental School, Philips van Leydenlaan 25, 6500 HB Nijmegen, The Netherlands

J.M. Van der Zel

Elephant Edelmetaal, Atoomweg 12, 1627 LE Hoorn, The Netherlands

E.H. Greener

Biological Materials, Northwestern University Dental School, 311 E. Chicago Ave., Chicago, Illinois 60611

Three ferromagnetic casting alloys intendedfor use with magnetically retained overdentures (compositions in wt%: #1, Pd 50, Co 47, Ga 2, Pt 1 ; #2, Pd 60, Co 37, Ga 2, Pt 2; #3, Pd 49, Co 46, Ga 2, Pt 2) were investigated. A 0.9% saline solution and an artificial saliva (Meyer) were used for evaluation of the electrochemical corrosion behavior of these alloys, utilizing standard potentiodynamic techniques.

All alloys investigated possessed a good corrosion resistance in the potential range of the oral environment (from - -100 to 300 mV versus SCE). In addition, alloys #1 and 3 appeared to be susceptible to pitting above +300 mV (SCE), while #2 was resistant to pitting and was found to passivate in 0.9% saline solution.

Journal of Dental Research, Vol. 66, No. 9, 1456-1459 (1987)
DOI: 10.1177/00220345870660090901
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