Patent US4483678A successfully refreshed from Google Patents.
US4483678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental implant for attachment of artificial tooth
Assignee: Niterra Co Ltd
•
Filing: 1983-07-07
•
Granted: 1984-11-20
•
Expires: 2003-07-07
Abstract
Abstract A dental implant for the attachment of a artificial tooth is described. This dental implant comprises a root portion to be embedded in bone and a top portion to be projected in the mouth, wherein the root portion comprises a high strength metal substrate, a ceramic or glass coating layer on the substrate, and a calcium phosphate coating layer on the ceramic or glass coating layer. The dental implant can be secured to a jaw bone and overcomes the problems involved in using conventional art dental implants, e.g., adverse influences of stainless steel.
Inventors
- 👤 Shinji Nishio
- 👤 Kazuo Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:23
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0012; A61C8/0013; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2002/30929; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00017; A61F2310/00023; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
A dental implant for the attachment of an artificial tooth, comprising a root portion to be embedded in bone and a top portion to be projected in the mouth from the tooth mucosa, wherein the root portion comprises a high strength metal substrate, a ceramic or glass coating layer on the metal substrate, and a calcium phosphate coating layer on the ceramic or glass coating layer.
Claim 2
Dependent Claim
66 words
A dental implant for the attachment of an artificial tooth, comprising a root portion to be embedded in bone and a top portion to be projected in the mouth from the tooth mucosa, wherein the root portion comprises a high strength metal substrate, a ceramic or glass coating layer on the metal substrate, and a calcium phosphate coating layer on the ceramic or glass coating layer.
Claim 3
Dependent Claim
18 words
A dental implant as in claim 1, wherein the ceramic or glass coating layer has an irregular surface.
Claim 4
Dependent Claim
20 words
A dental implant as in claim 1, wherein the ceramic coating layer is made of alumina, zirconia, spinel, or forsterite.
Claim 5
Dependent Claim
20 words
A dental implant as in claim 2, wherein the ceramic coating layer is made of alumina, zirconia, spinel, or forsterite.
Claim 6
Dependent Claim
24 words
A dental implant as in claim 1, wherein the calcium phosphate coating layer contains pores having an average diameter of from 20 to 500μ.
Claim 7
Dependent Claim
24 words
A dental implant as in claim 2, wherein the calcium phosphate coating layer contains pores having an average diameter of from 20 to 500μ.
Claim 8
Dependent Claim
24 words
A dental implant as in claim 3, wherein the calcium phosphate coating layer contains pores having an average diameter of from 20 to 500μ.
Claim 9
Dependent Claim
24 words
A dental implant as in claim 4, wherein the calcium phosphate coating layer contains pores having an average diameter of from 20 to 500μ.
Claim 10
Dependent Claim
15 words
A dental implant as in claim 1, wherein said calcium phosphate is an apatite ceramic.
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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |