US4497629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental implant and method of making same
Assignee: Nikon Corp
•
Filing: 1982-12-13
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Granted: 1985-02-05
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Expires: 2002-12-13
Abstract
Abstract A dental implant and a method of making same are disclosed. The dental implant comprises a biocompatible metal core and a multi-layer bioglass coating applied on the core. The outer layer of the multi-layer coating is formed of a bioglass whose chemical composition is selected from within the range of composition particularly defined by the present invention and which has substantially the same thermal expansion coefficient as the core. The inner layer is formed of a bioglass whose chemical composition is substantially the same as the glass of the outer layer with the exception that the content of TiO2 is increased within a particularly determined range.
Inventors
- 👤 Makoto Ogino
- 👤 Toshihiko Futami
- 👤 Michio Kariya
- 👤 Takeo Ichimura
- 👤 Takamitsu Fujiu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:31
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0012; A61C8/0013; C; C03; C03C; C03C27/00; C03C27/02; C03C3/00; C03C3/04; C03C3/062; C03C3/076; C03C4/00; C03C4/0007
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
A dental implant comprising a biocompatible metal core and a multi-layer glass coating applied on said core, said dental implant being characterized in that an outer layer of said multi-layer glass coating is formed of a biologically active glass composed of: ______________________________________
SiO.sub.2 35-60 mol %
B.sub.2 O.sub.3 0-15
Na.sub.2 O 10-30
CaO 5-40
TiO.sub.2 0-2
P.sub.2 O.sub.5 0-15
K.sub.2 O 0-20
Li.sub.2 O 0-10
MgO 0-5
La.sub.2 O.sub.3 + Ta.sub.2 O.sub.5 + Y.sub.2 O.sub.3
0-8
F.sub.2 0-15
______________________________________ and having substantially the same thermal expansion coefficient as that of said metal core, and that an inner layer of said multi-layer glass coating is formed of a lower or substantially no biologically active glass as obtained by merely increasing the content of TiO 2 in the glass composition selected for said outer layer to 5-10 mol%.
Claim 2
Dependent Claim
136 words
A dental implant comprising a biocompatible metal core and a multi-layer glass coating applied on said core, said dental implant being characterized in that an outer layer of said multi-layer glass coating is formed of a biologically active glass composed of: ______________________________________
SiO.sub.2 35-60 mol %
B.sub.2 O.sub.3 0-15
Na.sub.2 O 10-30
CaO 5-40
TiO.sub.2 0-2
P.sub.2 O.sub.5 0-15
K.sub.2 O 0-20
Li.sub.2 O 0-10
MgO 0-5
La.sub.2 O.sub.3 + Ta.sub.2 O.sub.5 + Y.sub.2 O.sub.3
0-8
F.sub.2 0-15
______________________________________ and having substantially the same thermal expansion coefficient as that of said metal core, and that an inner layer of said multi-layer glass coating is formed of a lower or substantially no biologically active glass as obtained by merely increasing the content of TiO 2 in the glass composition selected for said outer layer to 5-10 mol%.
Claim 3
Dependent Claim
39 words
A dental implant according to claim 1, wherein said outer layer is formed of a glass composed of: ______________________________________
SiO.sub.2 35-55 mol %
B.sub.2 O.sub.3
0-15
Na.sub.2 O 15-30
CaO 8-30
TiO.sub.2 0-2
P.sub.2 O.sub.5
0-8
F.sub.2 5-15
______________________________________
Claim 4
Dependent Claim
30 words
A dental implant according to claim 1, wherein said metal core is made of a metal selected from the group consisting of cobalt-chromium alloy, nickel-chromium alloy and iron-base austenite alloy.
Claim 5
Dependent Claim
39 words
A dental implant according to claim 1, wherein said inner layer has a thickness in the range of from 100 to 1000 μm and said outer layer has a thickness in the range of from 100 to 500 μm.
References Cited (Backward Citations)
US3368712A
Cited
US3922155A
Cited
US3987499A
Cited
US4365356A
Cited
US4223412A
Cited
US4159358A
Cited
US4234972A
Cited
US4411624A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |