Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-05-08
1999-11-23
Merriam, Andrew E. C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523115, 523209, 523216, 524493, 524494, 528502C, A61C 508, C08K 334
Patent
active
059901950
ABSTRACT:
A dental resin material which is formed into a dental prosthesis by milling processing is disclosed, comprising an acrylic resin polymer containing from 20 to 70% by weight of an inorganic filler having a mean particle size of from 0.01 to 0.04 .mu.m in diameter. A process for producing a dental resin material is also disclosed, which comprises polymerizing for curing a mixture comprising a combination of from 20 to 70% by weight of an inorganic filler having a mean particle size of from 0.01 to 0.04 .mu.m in diameter, a methacrylate or acrylate monomer having at least one unsaturated double bond, and a heat polymerization initiator while elevating the pressure and heating under the conditions that the pressure is from 50 to 300 MPa and that the temperature is from 100 to 200.degree. C. The dental resin material according to the invention has esthetics and mechanical properties suitable for dental prostheses such as inlays or crowns and being free from unpolymerized monomers, which is superior in machinability and can be suitably used for the preparation of dental prostheses by milling processing by means of a CAD/CAM device.
REFERENCES:
patent: 4297266 (1981-10-01), Ibsen et al.
patent: 4859716 (1989-08-01), Ibsen et al.
patent: 5356951 (1994-10-01), Yearn et al.
GC Corporation
Merriam Andrew E. C.
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