| Autor: |
Marshall, G. W., Finkelstein, G. F., Marshall, S. J., Greener, E. H. |
| Předmět: |
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| Zdroj: |
Journal of Oral Rehabilitation; Oct1976, Vol. 3 Issue 4, p359-370, 12p |
| Abstrakt: |
The γ2 (Sn7-8Hg) phase of the amalgam structure has been established as the most corrosion prone of conventional dental amalgam. Cu rich amalgams are currently of interest because some formulations appear to reduce or eliminate the γ2 phase. This investigation compares the microstructures of conventional amalgam to Cu rich amalgams prepared by various methods, i.e. a commercial alloy (Dispersalloy), an admixture of Cu amalgam with conventional amalgam, and admixtures of 30 % Cu-Ag-Sn ternary alloy with conventional amalgam. These variations in amalgam formulation resulted in marked reduction or elimination of 72 phase in the Cu rich amalgam microstructures. The matrix or γ1 (Ag2Hg3) phase was common to all formulations. Other phases and their proportions changed dramatically with different methods of introducing the Cu. The saline corrosion resistance, determined by potentiostatic anodic polarization in Ringer's solution, was enhanced for the Cu rich amalgams as a result of the elimination of the γ2 phase. This study suggests there are a variety of methods to introduce copper into amalgams and that these methods generally serve to eliminate γ2 phase and increase saline corrosion resistance. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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