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A silver-tin alternative to dental amalgams

Published online by Cambridge University Press:  03 March 2011

M.P. Dariel ,
U. Admon ,
D.S. Lashmore ,
M. Ratzker ,
A. Giuseppetti  and
F.C. Eichmiller
M.P. Dariel*
Affiliation:
Metallurgy Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
U. Admon*
Affiliation:
Metallurgy Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
D.S. Lashmore*
Affiliation:
Metallurgy Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
M. Ratzker
Affiliation:
American Dental Association Health Foundation, Paffenbarger Research Center, NIST, Gaithersburg, Maryland 20899
A. Giuseppetti
Affiliation:
American Dental Association Health Foundation, Paffenbarger Research Center, NIST, Gaithersburg, Maryland 20899
F.C. Eichmiller
Affiliation:
American Dental Association Health Foundation, Paffenbarger Research Center, NIST, Gaithersburg, Maryland 20899
*
a)On leave from the Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
a)On leave from the Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
b)Presently with Materials Innovation, Lebanon, New Hampshire 03784.
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Abstract

This paper describes a novel technology for a mercury-free metallic direct filling material, a substitute to dental amalgams. The consolidation relies both on cold-welding that takes place under moderate pressure between suitably surface-treated silver particles and on silver-tin intermetallic compound formation at ambient temperature. A dilute acid is used for removing the silver surface oxide layers, thereby promoting the cold-welding process. The condensability, namely the ability of a loose powder to undergo consolidation within a short time duration, at body temperature and under moderate pressure has been investigated for a variety of mixtures of silver, tin, and prealloyed silver-coated intermetallic powders. The resulting metallic composite material displays transverse rupture strength values higher than those of amalgams and somewhat lower values of compressive strength and Knoop hardness.

Type
Environmentally Benign Materials and Processes
Information
Journal of Materials Research , Volume 10 , Issue 3 , March 1995 , pp. 505 - 511
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

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