Johnson & Johnson Consumer Products, Inc.

Johnson & Johnson Dental Products Company

Ceramco Inc.

Robert D DeLuca

Robin M Jones

Carl Panzera

Carlino Panzera

Albert C Chen

Carolyn M Kramer

Donald S Mueller

John A Hornor

Robin M Forbes-Jones

Mary J Daub

John F McLaughlin

Mary S Yeganeh

Robin M Forbes Jones

Kevin A Andino

A low-fusing temperature porcelain compositions, methods of use thereof on metal or porcelain substrates to form dental prostheses and kits therefor. Compositions of the invention have a fusing temperature of less than 800.degree. C. and a coefficient of thermal expansion compatible with a substrate of metal or ceramic. Each composition includes, in weight percent of the composition, from 40 to 65 percent by weight SiO.sub.2, from 6 to 12 percent by weight Al.sub.2 O.sub.3, from 6 to 12 percent by weight Na.sub.2 O, from 5.5 to 10.50 percent by weight K.sub.2 O, from 1 to 3 percent by weight Li.sub.2 O, from 0.8 to 2.5 percent by weight CaO, from 0.8 to 4.0 percent by weight B.sub.2 O.sub.3 and from 0.1 to 0.8 percent by weight CeO.sub.2.

Low-fusing temperature porcelain, compositions, prostheses, methods and

An orthodontic bracket is made from crystalline alumina, preferably crystalline alpha-alumina. The bracket comprises a base member for attaching to a tooth and a body member extending from the base member. The body member includes walls that define an archwire groove. The walls comprise crystalline alumina. The bracket has sufficient strength to withstand normal torquing forces imparted by an archwire.

Crystalline alumina orthodontic bracket

The adhesive strength of alumina brackets to acrylic adhesive cements is enhanced by forming an essentially silica coating on the bonding surface of the bracket by the steps of coating said surface with an organosilicon compound such as a silane and then pyrolyzing the organosilicon coating to volatilize the organic components thereof to thereby leave an essentially silica coating.

Adhesive primer for alumina brackets

Orthodontic brackets are made from ion exchange strengthened glass. In a preferred embodiment, the glass is a lithium alumino silicate srengthened with sodium ions.

Orthodontic brackets made from ion exchange strengthened glass

The adhesion of crystalline alumina to adhesives is enhanced by coating the surface of the alumina that is to be in contact with the adhesive, with a very thin coating of a siliceous material such as sputter coated silica.

Crystalline alumina composites

There is disclosed an orthodontic bracket including a base member for attaching to a tooth and a body member extending from the base member. The body member includes walls that define an archwire groove. The walls are made of single crystal alumina. Preferably, the entire bracket is made of single crystal alumina, and most preferably, single crystal alpha-alumina or sapphire.

Process for joining ceramic components in precise spatial relationship which comprises firing the ceramic components joined by a ceramic frit on a sagger tray having a coefficient of thermal expansion that matches that of the ceramic components.

Method for joining ceramic components in precise spatial relationship

A process for producing a dental restoration wherein a bonding agent is disclosed for bonding dental porcelain to a nickel-containing metal core. The bonding agent is aluminum powder and an inert organic liquid carrier.

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Pennington, NJ, United States of America

Robert D DeLuca