Metal treatment – Stock – Age or precipitation hardened or strengthened
Patent
1993-04-23
1994-08-16
Dean, Richard O.
Metal treatment
Stock
Age or precipitation hardened or strengthened
420507, 148678, 433207, C22C 502
Patent
active
053383788
ABSTRACT:
A dental gold alloy which is soft enough for adjustment of a patient's occlusal condition, which is age-hardenable with passage of time at temperatures encountered within a patient's oral cavity, and which has a single phase structure which imparts improved corrosion resistance, the dental gold alloy consisting essentially of 82-67% by a weight of gold; 18-33% by weight of copper; and 2-8 at % of an age-hardening accelerator which is at least one metal selected from the group consisting of gallium, aluminum and zinc, wherein the dental gold alloy has been subjected to a solution treatment by heating at 670-700.degree. C. and quenching into water.
REFERENCES:
patent: 3861455 (1975-01-01), Ingersoll
Ohta, M., et al., "Development of Dental Gold Alloys With Age-Hardenability At Intraoral Temperature", Fourth World Biomaterials Congress, Berlin, FRG, Apr. 24-28, 1992, p. 378.
The Science News, vol. 4, p. 2412, (see graph in lower left), Jun. 5, 1992.
International Standard, ISO 1562-1976(E), "Dental Casting Gold Alloys", pp. 186-184.
"American Dental Associationspecification No. 5 for dental casting gold alloy", American Dental Association Specificaiton No. 5, Apr. 1965, pp. 184-186.
Matsuya Shigeki
Nakagawa Masaharu
Ohta Michio
Shiraishi Takanobu
Dean Richard O.
Kyushu University
Vincent Sean
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