A - Human Necessities – 61 – C
Patent
A - Human Necessities
61
C
83/1
A61C 7/02 (2006.01) A61C 7/12 (2006.01)
Patent
CA 1326382
CERAMIC ORTHODONTIC APPLIANCE Abstract An orthodontic bracket or similar orthodontic appliance is made of a polycrystalline ceramic having a translucency which minimizes visibility of the appliance when mounted on a tooth. The ceramic is formed by pressing a powder material, such as high purity aluminum oxide, and sintering to yield a single phase appliance having substantially zero porosity and an average grain size preferably in the range of 10 to 30 microns. The substantially color-free ceramic appliance has desirable strength and other mechanical properties combined with a translucency which permits the natural color of the tooth to diffusely show through in a fashion tending to make the appliance blend with and disappear against the tooth.
558018
Carden Robin
Gille Henrick Kurt
Kelly John Steven
Negrych John Anthony
3m Unitek Corporation
Ceradyne Inc.
Gowling Lafleur Henderson Llp
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