US5049074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental implant
Assignee: ONTANI SUGIO
•
Filing: 1990-03-29
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Granted: 1991-09-17
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Expires: 2010-03-29
Abstract
Abstract A dental implant comprising a core material and a porous layer formed on the core material, wherein at least a part of the core material coated by the porous layer has a non-circular cross-sectional shape so as not to rotate relative to the porous layer.
Inventors
- 👤 Sugio Otani
- 👤 Sadakatsu Yanagisawa
- 👤 Kunio Niijima
- 👤 Kazusi Matuura
- 👤 Hirosi Matino
- 👤 Tooru Fuse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:44
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0012; A61C8/0013; A61C8/0018
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A dental implant comprising a core material and a porous layer formed on the core material, wherein at least a part of the core material coated by the porous layer has a non-circular cross-sectional shape, said porous layer covering the non-circular cross-sectional area of said core material so as not to rotate relative to the porous layer, and wherein said porous layer has a thickness of at least 0.1 mm, and the pore size is at least 100 μm, at the surface of the porous layer and gradually decreases from the surface towards the core material side.
Claim 2
Dependent Claim
97 words
A dental implant comprising a core material and a porous layer formed on the core material, wherein at least a part of the core material coated by the porous layer has a non-circular cross-sectional shape, said porous layer covering the non-circular cross-sectional area of said core material so as not to rotate relative to the porous layer, and wherein said porous layer has a thickness of at least 0.1 mm, and the pore size is at least 100 μm, at the surface of the porous layer and gradually decreases from the surface towards the core material side.
Claim 3
Dependent Claim
18 words
The dental implant according to claim 1, wherein the porous layer has a porosity of at least 10%.
Claim 4
Dependent Claim
18 words
The dental implant according to claim 1, wherein the porous layer is composed essentially of a carbon material.
Claim 5
Dependent Claim
30 words
The dental implant according to claim 1, wherein the portion of the dental implant, which is in contact with the bone tissue, comprises a threaded portion and said porous layer.
Claim 6
Dependent Claim
21 words
The dental implant according to claim 1, wherein the core material is made of an electrically conductive carbon or metal material.
Claim 7
Dependent Claim
19 words
The dental implant according to claim 1, wherein the porous layer has a porosity of from 30 to 40%.
Claim 8
Dependent Claim
26 words
The dental implant according to claim 1, wherein the core material has a surface roughness R max of at least 10 μm formed by blast treatment.
References Cited (Backward Citations)
DE249632C
Cited
DE1042834B
Cited
US3981736A
Cited
US4051598A
Cited
US3934347A
Cited
US4599085A
Cited
US4424037A
Cited
GB2092891A
Cited
US4457984A
Cited
US4648842A
Cited
US4818559A
Cited
EP0211676B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |