Robert F Deluca

US Patent:

57139946, Feb 3, 1998

Filed:

Jun 10, 1996

Appl. No.:

8/660996

Inventors:

Carolyn M. Kramer - Moorestown NJ
John F. McLaughlin - Lakehurst NJ
Robert D. DeLuca - Pennington NJ
John A. Hornor - Siklerville NJ
Mary J. Daub - Mt. Laurel NJ
Kevin A. Andino - Freehold NJ

Assignee:

Ceramco Inc. - Burlington NJ

International Classification:

C03C 3091

US Classification:

106 35

Abstract:

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.

US Patent:

46392181, Jan 27, 1987

Filed:

Jun 12, 1985

Appl. No.:

6/743851

Inventors:

Robin M. F. Jones - Titusville NJ
Robert D. DeLuca - Pennington NJ
Carlino Panzera - Belle Mead NJ

Assignee:

Johnson & Johnson Dental Products Company - East Windsor NJ

International Classification:

A61C 700

US Classification:

433 8

Abstract:

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.