US5011403A
Expired / Lapsed
US
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Orthodontic bracket made from zirconium oxide
Assignee: Individual
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Filing: 1989-02-17
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Granted: 1991-04-30
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Expires: 2009-02-17
Abstract
Abstract A nonporous ceramic bracket for bonding to the external face of a tooth is made of compressed zirconium oxide particles which are partially stabilized by a transition metal oxide. The bracket has a color and translucency substantially corresponding to the tooth to which it is bonded.
Inventors
- 👤 Michael Sadoun
- 👤 Alain Decker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:38
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; A; A61; A61C; A61C7/00; A61C7/12; C04B35/622; C04B35/626; C04B35/62605; C04B35/62695; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3208; C04B2235/3224; C04B2235/3225; C04B2235/3229; C04B2235/3262; C04B2235/327; C04B2235/3272; C04B2235/3279; C04B2235/44; C04B2235/448; C04B2235/449; C04B2235/50; C04B2235/52; C04B2235/528; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/60; C04B2235/604; C04B2235/608; C04B2235/65; C04B2235/656; C04B2235/6562; C04B2235/70; C04B2235/72; C04B2235/74; C04B2235/78; C04B2235/785; C04B2235/96; C04B2235/9646; C04B2235/9653; C04B2235/9661
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
42 words
A nonporous ceramic bracket for bonding to the external face of a tooth consisting essentially of sintered small zirconium oxide particles partially stabilized by a transition metal oxide, said bracket having a color and translucency substantially corresponding to those of said tooth.
Claim 2
Dependent Claim
42 words
A nonporous ceramic bracket for bonding to the external face of a tooth consisting essentially of sintered small zirconium oxide particles partially stabilized by a transition metal oxide, said bracket having a color and translucency substantially corresponding to those of said tooth.
Claim 3
Dependent Claim
19 words
The nonporous bracket of claim 1 wherein the size of said zirconium oxide particles is less than 0.5 micron.
Claim 4
Dependent Claim
21 words
The nonporous ceramic bracket of claim 2 wherein the size of said zirconium oxide particles ranges from 0.2 to 0.5 micron.
Claim 5
Dependent Claim
22 words
The nonporous ceramic bracket of claim 1 containing at least 99.99% of said zirconium oxide partially stabilized by a transition metal oxide.
Claim 6
Dependent Claim
33 words
The nonporous ceramic bracket of claim 1 wherein said transition metal oxide is yttrium oxide present in an amount ranging from 3 to 8 percent by weight of the weight of zirconium oxide.
Claim 7
Dependent Claim
30 words
The nonporous ceramic bracket of claim 5 wherein said yttrium oxide is present in an amount ranging from 3 to 5 percent by weight of the weight of zirconium oxide.
Claim 8
Dependent Claim
33 words
The nonporous ceramic bracket of claim 1 wherein said transition metal oxide is calcium oxide present in an amount ranging from 3 to 10 percent by weight of the weight of zirconium oxide.
Claim 9
Dependent Claim
30 words
The nonporous ceramic bracket of claim 7 wherein said calcium oxide is present in an amount ranging from 3 to 5 percent by weight of the weight of zirconium oxide.
Claim 10
Dependent Claim
33 words
The nonporous ceramic bracket of claim 1 wherein said transition metal oxide is magnesium oxide present in an amount ranging from 8 to 15 percent by weight of the weight of zirconium oxide.
Claim 11
Dependent Claim
30 words
The nonporous ceramic bracket of claim 9 wherein said magnesium oxide is present in an amount ranging from 8 to 10 percent by weight of the weight of zirconium oxide.
Claim 12
Dependent Claim
33 words
The nonporous ceramic bracket of claim 1 wherein said transition metal oxide is cerium oxide present in an amount ranging from 11 to 20 percent by weight of the weight of zirconium oxide.
Claim 13
Dependent Claim
30 words
The nonporous ceramic bracket of claim 11 wherein said cerium oxide is present in an amount ranging from 14 to 17 percent by weight of the weight of zirconium oxide.
Claim 14
Dependent Claim
23 words
The nonporous ceramic bracket of claim 1 wherein said bracket has been sintered at a temperature ranging from approximately 1300° to 1650° C.
Claim 15
Dependent Claim
23 words
The nonporous ceramic bracket of claim 13 wherein said bracket has been sintered at a temperature ranging from approximately 1300° to 1400° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-29 | 1994-10-29 | 1995-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-29 | 1998-10-29 | 1999-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-29 | 2002-10-29 | 2003-04-30 | $7700.00 | Window Closed / Lapsed |