Plastic and nonmetallic article shaping or treating: processes – Dental shaping type – Tooth forming
Patent
1997-05-12
1998-12-01
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Dental shaping type
Tooth forming
264628, 264643, 264651, 427 226, A61C 1308
Patent
active
058433481
ABSTRACT:
A process for producing a ceramic network material from a ceramic suspension includes casting a suspension in a tooth-shaped mold. The suspension includes dispersed alumina particles in a medium containing deionized water with a pH in a range of about 4 to 5 and a concentration of polyvinyl alcohol in a range of about 0.5 to 1% by weight. The process includes the steps of slip casting the suspension in a plaster tooth mold and drying the molded suspension to draw the water from the suspension. The dried suspension then is fired in a furnace at a temperature in a range of about 1000 to 1400.degree. C. to form a ceramic network. After the dried suspension has been fired and excess water and polyvinyl alcohol has been removed from the suspension, lanthanum aluminosilicate glass is infused to a coronal portion of the ceramic network to form a glass layer with a thickness in a range of about 1 to 2 mm within the ceramic network. A monomer, such as a monomer solution, then is infused to at least the portion of the ceramic network within the glass layer. Alternatively, the ceramic network may be infused with a metal alloy to form a layer on the coronal portion or with one or more monomers.
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Fiorilla Christopher A.
Trustees of Boston University
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