Metal founding – Process – Shaping a forming surface
Patent
1984-02-29
1986-01-07
Anderson, Philip
Metal founding
Process
Shaping a forming surface
164 46, 264 16, 264222, 264338, 433171, 4332001, 433214, B22C 100, B22D 2300
Patent
active
045628823
ABSTRACT:
A method of making a dental prosthesis includes providing an upper or a lower impression of the oral cavity of a patient; and filling such impression with a castable mixture comprising (1) a ceramic composition containing a major proportion of magnesia and a significant minor proportion of alumina and (2) an aqueous composition containing silica as the essential ingredient, the ratio of the aqueous silica composition to the ceramic composition being such as to render the latter flowable. The mixture is then permitted to harden in the impression, and the resulting hardened model is removed from the impression. Thereafter, a liquefied metal composition is spray-coated on to a selected portion of the model to form a metallic prosthetic base, which is separated from the selected portion of the model and provided with a porcelain coating on its exterior surface.
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Anderson Philip
Garbo Paul W.
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