Plastic article or earthenware shaping or treating: apparatus – Means forming a mold; or flask – per se – Including ram type feed of molding material or means to...
Patent
1997-09-11
1999-04-27
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Means forming a mold; or flask, per se
Including ram type feed of molding material or means to...
425547, 425567, 425574, 65 331, 65183, B29C 4574
Patent
active
058978852
ABSTRACT:
The present invention is concerned with a process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. In this invention, a dental restoration is prepared by placing a glass-ceramic material in a heat-pressure deformable crucible. Heat is then applied to the crucible in order to bring the glass-ceramic material to a working range at temperatures above its liquidus temperature. The crucible in which the glass-ceramic material is placed has heat-pressure deformation properties which are matched to the working temperature of the glass-ceramic material being heated. The heat deformation properties of the crucible must be such that when the glass-ceramic material in the crucible is in the working range the crucible is heat-pressure deformable without rupturing. Once the glass-ceramic material is heated to its working temperature, the crucible is brought into contact with a mold having a preformed cavity therein, the cavity being in the shape of the desired dental restoration. As the distance between the heated glass-ceramic material and the mold is decreased, the crucible is deformed to form a seal with the mold thereby facilitating the injection of the molten glass-ceramic material into the mold cavity.
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Bahr Donald R.
Davis Robert
TEC Ventures, Inc.
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