Bonding dental porcelain
OwnerJack R. Griffithinventor
Life of this patent
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Abstract
The bonding of smooth dental porcelain using glass-ionomer cement has hitherto been difficult. The present invention incorporates particles of an ion-leachable glass, particularly a calcium fluoroaluminosilicate glass, in the dental porcelain and improves the bonding properties.
Claims6
A composition useful for the preparation of a dental porcelain, said porcelain being capable of being bonded by means of a cement comprising a poly(carboxylic acid) which composition comprises
- a dental porcelain powder suitable for the production of dental porcelain;
- an ion-leachable glass in particulate form in intimate admixture with said dental porcelain powder;
- said ion-leachable glass in admixture with said porcelain powder being a calcium fluoroaluminosilicate glass having a particle size in the range 100-400 microns, and said ion-leachable glass particles constituting 10 to 65% by weight of said composition.
A fired and shaped dental porcelain containing dental porcelain powder and having incorporated therein an ion-leachable glass in particulate form, the porcelain being capable of being bonded by means of a cement comprising
- a poly(carboxylic acid), wherein
- said ion-leachable glass is a calcium Fluoroaluminosilicate glass having a particle size in the range 100-400 microns, and
- said ion-leachable glass particles constitute 10 to 65% by weight of said porcelain.
A method for the preparation of a dental porcelain, said porcelain being capable of being bonded by means of a cement comprising a poly(carboxylic acid), which method comprises:
- (1) admixing a slurry comprising a dental porcelain powder with a particulate ion-leachable glass, said ion-leachable glass in admixture with said porcelain powder being a calcium fluoroaluminosilicate glass having a particle size in the range 100-400 microns, and said glass particles constituting 10 to 65% by weight of said admixture;
- (2) shaping the admixture into the desired form and
- (3) firing said formed admixture.
Dependencies are inferred from the claim text.