Compositions: coating or plastic – Coating or plastic compositions – Dental
Reexamination Certificate
2001-02-16
2003-03-04
Koslow, C. Melissa (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Dental
C501S005000, C501S066000, C501S070000, C501S071000, C501S072000
Reexamination Certificate
active
06527846
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a glass ceramic for dental restoration and to a method for its production.
BACKGROUND OF THE INVENTION
A glass ceramic of this type is known from U.S. Pat. No. 4,798,536. This patent describes a specific porcelain material which is used as a tooth replacement material. Porcelain as a tooth replacement material has in principle been known for a long time, and is also known to be relatively susceptible to breaking. Therefore, metal substructures have generally been used in order to obtain the desired strength.
U.S. Pat. No. 4,798 536 has disclosed a porcelain material which has breaking strength properties which are such that it appears to be suitable for use as a dental material on its own.
However, it has emerged that the forces and loads which occur in the mouth may nevertheless impose loads on the material which may cause it to break.
SUMMARY OF THE INVENTION
Working on the basis of this prior art, the invention is based on the object of improving a glass ceramic of the type mentioned in the introduction in such a way that it is more resistant to breaking. A further object of the present invention is to specify a method for its production.
These objects are achieved by means of the features of claims 1 and 9, respectively.
REFERENCES:
patent: 4798536 (1989-01-01), Katz
patent: 5622551 (1997-04-01), Erbe et al.
patent: 5653791 (1997-08-01), Panzera et al.
patent: 5698019 (1997-12-01), Frank et al.
patent: 0 272 745 (1988-06-01), None
patent: 0 475 528 (1990-03-01), None
Database WPI, Section Ch, week 7833, Derwent Publications Ltd. London, GB: class L02, AN-78-59289A, XP002112378, JP 53 078220 A (Jul. 11, 1978).
Chemichl AG
Finnegan Henderson Farabow Garrett & Dunner LLP
Koslow C. Melissa
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