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PubMed1984

The morphological characterization of dental amalgam alloy powders.

Two commercially available amalgam alloy powders (one lathe-cut, the other spherical) were characterized in terms of density, surface area, particle size distribution and appearance under the scanning electron microscope. A third, experimental alloy powder, prepared by electrodeposition, was subjected to a similar analysis. It was found that particle size distribution can be a misleading indicator, in that when particles are porous, inordinately large amounts of mercury will be taken up on trituration, and the resulting amalgam will have wholly unsatisfactory mechanical properties. Surface area measured by BET (gas adsorption) may be the best single index of the morphological quality of an amalgam alloy powder.

Dental Alloys↗
PubMed1986

Test of long-term corrosion of dental amalgams.

Seven non-gamma 2-amalgams and one conventional amalgam were used in the study. Cylindrical specimens were kept in a test solution for 1 yr. The depth of corrosion was measured and leakage of copper, zinc and mercury was determined by atomic absorption spectrophotometry. EDX was used to analyze the corrosion products. The results showed that copper leakage from the non-gamma 2-amalgams was higher than from the conventional amalgam. The amount of copper in the solution was not related to the concentration in the alloy. Dissolution of this ion was low during the last 6 months of the experimental period. Mercury leakage was comparatively low for all tested amalgams but the rate seemed to be less time dependent and leakage probably had not stopped after 1 yr. The depth of corrosion in the amalgams was in the range 100-500 micron. Under the experimental conditions the non-gamma 2-amalgams were more corroded than the conventional amalgam.

Chemical Phenomena↗
PubMed1980

X-ray mapping of dental amalgam using the electron microprobe.

Tin, copper, silver and mercury X-ray maps were obtained for amalgams prepared from three "high copper" commercial alloys. The data obtained from quantitative analysis of a silver-copper dispersed amalgam was subjected to major element analysis. X-ray mapping was found to reflect accurately the relative quantity of an element present in different regions of a map, thereby providing a reliable qualitative, part-quantitative analysis of the structure of the amalgam.

Chemical Phenomena↗