Johnson & Johnson Consumer Products, Inc.

Jeneric/pentron Inc.

Carl Panzera

Robert D DeLuca

Robin M Jones

Dmitri G Brodkin

Paul Panzera

Jana N Pruden

Lisa M Kaiser

Richard A Brightly

Robin M Forbes Jones

A dental porcelain composition, comprising a glassy matrix and leucite crystallites embedded therein, and having maturing temperatures in the range from about 600.degree. C. to about 885.degree. C. and CTEs in the range from about 11 to about 19, more preferably in the range from about 11.5 to about 18, and most preferably in the range from about 12 to about 17.5.times.10.sup.-6 /.degree.C. (measured from 25.degree. C. to 500.degree. C.). The tetragonal leucite is preferably both fine-grained (i.e, having average diameters of less than about 7 microns) and uniformly-sized. Preferably, the average diameters are less than about 1 to about 3 microns.

Low fusing dental porcelains containing fine-grained leucite

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

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

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Belle Mead, NJ, United States of America

Carl Panzera