Although the corrosion characteristics of dental amalgam have been of considerable interest to dental researchers, it has been difficult to identify the products which form in vivo. This report demonstrates that Sn4(OH)6Cl 2 and SnO are formed in vivo and in vitro. The Sn-Cl product is the predominant phase formed by corrosion-induced changes of the Sn8Hg phase of amalgam. It is present in conventional and, in smaller amounts, Cu-rich amalgam restorations.
References
1.
Jrgensen, K.D. : The Mechanism of Marginal Fracture of Amalgam Fillings, Acta Odont Scand23:347-389, 1965.
2.
Guthrow, C.E. ; Johnson, L.B.; and Lawless, K.R.: Corrosion of Dental Amalgam and its Component Phases, J Dent Res46:1372-1381,1967.
3.
Sarkar, N.K. and Greener, E.H.: Saline Corrosion of Conventional Dental Amalgams, J Oral Rehab2:49-62, 1975.
4.
Mueller, H.J. ; Greener, E.H.; and Crimmins , D.S.: The Electrochemical Properties of Dental Amalgam, J Biomed Mater Res2:95-119, 1968.
5.
Holland, G.A. and Asgar, K.: Some Effects on the Phases of Amalgam Induced by Corrosion, J Dent Res53:1245-1254, 1974 .
6.
Sarkar, N.K.; Marshall, G.W.; Moser, J.B.; and Greener, E.H.: In vivo and In vitro Corrosion Products of Dental Amalgam, J Dent Res54:1031-1038, 1975 .
7.
Marshall, G.W.; Sarkar, N.K.; and Greener, E.H.: Detection of Oxygen in Corrosion Products of Dental Amalgam, J Dent Res54:904, 1975.
8.
Marshall, G.W.; Finkelstein, G.F.; Marshall, S.J.; and Greener, E.H.: Microstructural Changes of Dental Amalgam by Copper Addition, J Oral Rehab3 :359-370,1976.
9.
Marshall, G.W.; Marshall, S.J.; and Greener, E.H.: SEM/EDX Analysis of New Dental Amalgams. Jåhari, 0., ed. Scanning Electron Microscopy, Chicago: IITRI;1977 , Vol. 1,129-136.
10.
Powder Diffraction File, J.C.P.D.S., Intl. Centre for Diffraction Data, Swarthmore, PA, 1977.
11.
Greener, E.H. : Anodic Polarization of New Dental Amalgam , J Dent Res55:1142, 1976.
12.
Duc, H. DO.; Tissot, P.; and Meyer, J.M.: Potential Sweep and Intensiostatic Pulse Studies of Sn, SngHg and Dental Amalgam in Chloride Solution, J Dent Res58:576-583, 1979.
13.
Espevik, S. : In vitro Corrosion of Dental Amalgam with Different Cu Content, Scand J Dent Res85:631-636, 1977.
14.
Marshall, G.W. ; Jackson, B.L.; Marker , B.; and Marshall, S.J.: Cu-rich and Conventional Amalgams After Clinical Use, IADR Abstr. 357, J Dent Res58(A): 182,1979 .
