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Amalgamation reaction of tin, silver, and dental alloy (Ag3Sn)

✍ Scribed by Okabe, Toru ;Ling, Fu-Wen ;Hochman, Robert F.

Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
695 KB
Volume
6
Category
Article
ISSN
0021-9304

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✦ Synopsis

The reactions between liquid mercury and high purit,y tin, silver, and silver-t,in dental alloy (Ag,Sn) were studied at 30Β°C. Polyhedral-shaped cryslals formed both on the tin and Ag3Sri specimens, while no crystalites were detected on the surface of the silver. The cryst,als on the tin surface were ident,ified as y2 by x-ray diffraction methods. Electron microprobe data revealed that the polyhedral crystals which formed on the Ag3Sn consisted only of the silver-mercury compound which dissolved a small amount of liri (Ag 28.5, Hg 71.1, Sn 0.4 wt. yo). The diffusion profile for the Ilg-Ag,Sn syst,em demonstrated that silver atoms migrate much fasler than tin atoms in Ag& b0i.h at the surface and in the area close t,o the mercury-penetrated grain boundaries. It is clearly demonstrated that the bulk and grain-boundary diffiision of ~i l v e r is a major factror in t,he clinical setting reaction of dental amalgam.

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