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Corrosion of the η′(Cu-Sn) phase in dental amalgam

✍ Scribed by Marek, M. ;Okabe, T. ;Butts, M. B. ;Fairhurst, C. W.

Publisher
John Wiley and Sons
Year
1983
Tongue
English
Weight
492 KB
Volume
17
Category
Article
ISSN
0021-9304

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✦ Synopsis

Previous studies have shown preferential corrosion of the q'(Cu-Sn) phase in highcopper dental amalgam both in vifro and in vivo, while samples of pure 7' have shown high corrosion resistance. To clarify this contradiction, samples of pure q' crystals mixed with other phases were prepared and tested. Evaluation of the corrosion resistance was based on the results of coulometry at constant potential and potentiodynamic polarization. The corrosion susceptibility of q' in the matrix of yl(Ag-Hg) was con-siderably higher than the susceptibility of isolated 1'. The susceptibility of pure rJ also could be increased by plating it will small amounts of Hg. It was concluded that in dental amalgam, the presence of mercury in the phases surrounding v' reduces its resistance to corrosion. Although 7)' is more resistant to corrosion than yz(Sn-Hg) which appears in low-copper amalgams, it is the least corrosion resistant major phase in high-copper amalgams and can suffer deterioration.

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