Ceramic orthodontic appliance
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United States of America Patent
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-
Sep 4, 1990
Issued Date -
N/A
app pub date -
Sep 21, 1988
filing date -
May 8, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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