Patent US4451235A successfully refreshed from Google Patents.
US4451235A
Expired / Lapsed
US
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Process for preparing an artificial dental root
Assignee: Kureha Corp
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Filing: 1983-04-04
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Granted: 1984-05-29
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Expires: 2003-04-04
Abstract
Abstract An artificial dental root comprised of a particulate or powdered form of synthetic hydroxyapatite or calcined or sintered synthetic hydroxyapatite or a mixture thereof and an organic matrix, the surface area of said artificial dental root to be brought into contact with a bone being composed of both a phase of said hydroxyapatite and a phase of said organic matrix. The artificial dental root is prepared by blending said hydroxyapatite with said organic matrix and molding the blend. The artificial dental root has moderate affinity for a bone and high mechanical strength.
Inventors
- 👤 Kensuke Okuda
- 👤 Hirosi Nagai
- 👤 Hiroto Fujimaki
- 👤 Atsushi Tomonaga
- 👤 Hideki Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:47
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/50; A61K6/58; A61K6/15; A61K6/17; A61K6/70; A61K6/71; A61K6/74; A61K6/75
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
99 words
A process for preparing an artificial dental root comprising uniformly blending a particulate or powdered form of synthetic hydroxyapatite or calcined or sintered synthetic hydroxyapatite or a mixture thereof with an organic matrix, molding the blend, cutting the surface of the molded product, and causing the cut surface area of the molded product to be brought into contact with a bone wherein said cut surface area is composed of both a phase of said hydroxyapatite and a phase of said organic matrix in a surface area ratio of hydroxyapatite phase to organic matrix phase of from 5:95 to 70:30.
Claim 2
Dependent Claim
99 words
A process for preparing an artificial dental root comprising uniformly blending a particulate or powdered form of synthetic hydroxyapatite or calcined or sintered synthetic hydroxyapatite or a mixture thereof with an organic matrix, molding the blend, cutting the surface of the molded product, and causing the cut surface area of the molded product to be brought into contact with a bone wherein said cut surface area is composed of both a phase of said hydroxyapatite and a phase of said organic matrix in a surface area ratio of hydroxyapatite phase to organic matrix phase of from 5:95 to 70:30.
Claim 3
Dependent Claim
12 words
Process of claim 1, wherein said ratio is about 10:90 to 60:40.
Claim 4
Dependent Claim
29 words
A process according to claim 1, wherein the particle diameter of said synthetic hydroxyapatite or calcined or sintered synthetic hydroxyapatite or said mixture is not more than 1000 μm.
Claim 5
Dependent Claim
46 words
A process according to claim 1, wherein one or more polymers selected from bisphenol A-glycidyl methacrylate polycondensates, polymethyl methacrylste, poly-2-hydroxyethyl methacrylate, polyethylene, polysulfones, polyamides, polyesters, polytetrafluoroethylene, polyvinylidene fluoride and polycarbonates, and copolymers of two or more monomers of said polymers are employed as said organic matrix.
References Cited (Backward Citations)
US4097935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |