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US5123844A
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Living hard tissue replacement prepared by superplastic forming of a calcium phosphate base
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1990-06-20
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Granted: 1992-06-23
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Expires: 2010-06-20
Abstract
Abstract A living hard tissue replacement is prepared by subjecting a calcium phosphate base ceramic material to superplastic forming. Also provided is a method for preparing a composite body comprising the step of joining a cover of a calcium phosphate base ceramic material to a substrate of a heterogeneous material by superplastic forming. Superplastic forming is often performed by hot isostatic pressing. The living hard tissue replacement and composite body are useful as artificial dental roots, dental crowns, and bones.
Inventors
- 👤 Fumihiro Wakai
- 👤 Yasuharu Kodama
- 👤 Tohru Nonami
- 👤 Nobuo Yasui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:04
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/12; A61C; A61C8/00; A61C8/0012; A61K; A61K6/00; A61K6/15; A61K6/17; A61K6/80; A61K6/802; A61K6/816; A61K6/818; A61K6/822; A61K6/831; A61K6/838; A61K6/849; A61K6/864; A61L27/28; A61L27/30; A61L27/32; A61L27/40; A61L27/42; A61L27/425; A61L27/50; C; C04; C04B; C04B35/00; C04B35/01; C04B35/447; C04B35/622; C04B35/64; C04B35/645; C04B35/6455; C04B37/00; C04B37/001; C04B37/02; C04B37/021; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; A61F2310/00389; A61F2310/00592; A61F2310/00796; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6567; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/345; C04B2237/348; C04B2237/36; C04B2237/361; C04B2237/365; C04B2237/368; C04B2237/40; C04B2237/403; C04B2237/405; C04B2237/406; C04B2237/408; C04B2237/50; C04B2237/66; C04B2237/70; C04B2237/704; C04B2237/706; C04B2237/76; C04B2237/84
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
28 words
A living hard tissue replacement prepared by the superplastic forming of a calcium phosphate base ceramic material to a deformation of at least about 0.1 in true strain.
Claim 2
Dependent Claim
28 words
A living hard tissue replacement prepared by the superplastic forming of a calcium phosphate base ceramic material to a deformation of at least about 0.1 in true strain.
Claim 3
Dependent Claim
36 words
A living hard tissue replacement prepared by superplastic forming a calcium phosphate base ceramic material having an average grain size of up to 10 μm to a deformation of at least about 0.1 in true strain.
Claim 4
Dependent Claim
36 words
A living hard tissue replacement prepared by superplastic forming a calcium phosphate base ceramic material having an average grain size of up to 10 μm to a deformation of at least about 0.1 in true strain.
Claim 5
Dependent Claim
23 words
The tissue replacement of claim 1 or 2, wherein the superplastic forming is carried out at a temperature of 500° to 1,600° C.
Claim 6
Dependent Claim
30 words
A living hard tissue replacement in the form of a composite body prepared by joining a calcium phosphate base ceramic material and a material of different type of superplastic forming.
Claim 7
Dependent Claim
30 words
A living hard tissue replacement in the form of a composite body prepared by joining a calcium phosphate base ceramic material and a material of different type of superplastic forming.
Claim 8
Dependent Claim
18 words
The tissue replacement of claim 4 wherein said material of different type is a metal or ceramic material.
Claim 9
Dependent Claim
14 words
The tissue replacement of claim 4 wherein the joining step includes hot isostatic pressing.
Claim 10
Dependent Claim
29 words
The tissue replacement of claim 6 which further includes shaping said material of different type into a substrate and joining a cover of said ceramic material to the substrate.
Claim 11
Dependent Claim
51 words
The tissue replacement of claim 7 wherein said molding step includes molding the substrate to substantially the same shape as the composite body, and said joining step includes applying a cover of the superplastic ceramic material to said substrate and effecting hot isostatic pressing on the covered substrate through ceramic powder.
Claim 12
Dependent Claim
48 words
The tissue replacement of claim 1 which further includes shaping said material of different type into a substrate having substantially the same shape as the composite body, covering said substrate with the superplastic ceramic material, and effecting hot pressing, thereby joining said superplastic ceramic material to the substrate.
Claim 13
Dependent Claim
21 words
The tissue replacement of claim 9 wherein said substrate covered with said superplastic ceramic material is hot pressed through ceramic powder.
Claim 14
Dependent Claim
62 words
A living hard tissue replacement comprising: a calcium phosphate base ceramic material; and a substrate formed of a material different than said calcium phosphate base ceramic material; wherein said substrate defines a predetermined configuration based on intended use and said calcium phosphate base ceramic material is joined to said substrate by superplastic forming so as to form a cover on said substrate.
Claim 15
Dependent Claim
62 words
A living hard tissue replacement comprising: a calcium phosphate base ceramic material; and a substrate formed of a material different than said calcium phosphate base ceramic material; wherein said substrate defines a predetermined configuration based on intended use and said calcium phosphate base ceramic material is joined to said substrate by superplastic forming so as to form a cover on said substrate.
Claim 16
Dependent Claim
22 words
The living hard tissue replacement of claim 11 in the form of an artificial dental root, artificial dental crown or artificial bone.
Claim 17
Dependent Claim
74 words
The living hard tissue replacement of claim 11, further comprising: a ceramic powder surrounding said substrate covered by said calcium phosphate base ceramic material; and a glass envelope enclosing said substrate covered by said calcium phosphate base ceramic material and surrounded by said ceramic powder; wherein heat and pressure are applied to said enclosed substrate and calcium phosphate base ceramic material so as to bond said substrate and said calcium phosphate base ceramic material.
Claim 18
Dependent Claim
88 words
A living hard tissue replacement in the form of a composite body prepared by forming a calcium phosphate organic material having an average grain size of up to 10 μm and joining a calcium phosphate base ceramic material and a material of different type of superplastic forming; wherein said material of different type is molded into substantially the same shape as the composite body and said calcium phosphate base ceramic material is disposed on said material of different type so as to cover said material of different type.
Claim 19
Dependent Claim
88 words
A living hard tissue replacement in the form of a composite body prepared by forming a calcium phosphate organic material having an average grain size of up to 10 μm and joining a calcium phosphate base ceramic material and a material of different type of superplastic forming; wherein said material of different type is molded into substantially the same shape as the composite body and said calcium phosphate base ceramic material is disposed on said material of different type so as to cover said material of different type.
References Cited (Backward Citations)
US4599085A
Cited
US4429691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |