US4957437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial tooth
Assignee: Mitsubishi Mining and Cement Co Ltd
•
Filing: 1989-02-16
•
Granted: 1990-09-18
•
Expires: 2009-02-16
Abstract
Abstract An artifical tooth comprises a contacting member formed of a composite material having compatibility with living tissues and diaposed at an outer portion of the artificial tooth to be contacted with alveolar bone, a metal base member having an opening therein and disposed inside of and attached to the contacting member, a metal post inserted into the opening of the metal base member and at least two elastic buffer members disposed in a space between the metal base member and the metal post. The composite material having compatibility with living tissues contains 40 to 95% by weight of a calcium phosphate compound and 60 to 5% by weight of an organic polymer. Each of the elastic buffer members is spaced apart for movably receiving the metal post by which pressure imposed upon the artificial tooth is transmitted.
Inventors
- 👤 Kaizo Shimura
- 👤 Hiroyasu Takeuchi
- 👤 Masahiro Hirano
- 👤 Yohji Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:13
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0048; A61C8/005; A61C8/0065; A61C8/0086; A61C8/0057; A61C8/0059; A61C8/0068
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
156 words
An artificial tooth comprising a contacting member formed of a composite material having compatibility with living tissues and disposed at an outer portion of the artificial tooth to be contacted with alveolar bone, a metal base member having an opening therein and disposed inside of and attached to said contacting member, a metal post inserted into said opening of the metal base member and at least two elastic buffer members disposed in a space between said metal base member and said metal post, said composite material having compatibility with living tissues containing 40 to 95% by weight of a calcium phosphate compound and 60 to 5% by weight of an organic polymer, each of said elastic buffer members being spaced apart for movably receiving said metal post by which pressure imposed upon the artificial tooth is transmitted, said metal base member being constituted by an upper section and a lower section removably connected to each other.
Claim 2
Dependent Claim
156 words
An artificial tooth comprising a contacting member formed of a composite material having compatibility with living tissues and disposed at an outer portion of the artificial tooth to be contacted with alveolar bone, a metal base member having an opening therein and disposed inside of and attached to said contacting member, a metal post inserted into said opening of the metal base member and at least two elastic buffer members disposed in a space between said metal base member and said metal post, said composite material having compatibility with living tissues containing 40 to 95% by weight of a calcium phosphate compound and 60 to 5% by weight of an organic polymer, each of said elastic buffer members being spaced apart for movably receiving said metal post by which pressure imposed upon the artificial tooth is transmitted, said metal base member being constituted by an upper section and a lower section removably connected to each other.
Claim 3
Dependent Claim
21 words
An artificial tooth according to claim 1 wherein said upper section and said lower section are threadedly connected to each other.
Claim 4
Dependent Claim
27 words
An artificial tooth according to claim 1 wherein a high polymer biocompatible material is affixed to a portion of the metal base member contacting with gingival mucosa.
Claim 5
Dependent Claim
21 words
An artificial tooth according to claim 1 wherein said elastic buffer member interconnects said metal base member and said metal post.
Claim 6
Dependent Claim
14 words
An artificial tooth according to claim 1 wherein said calcium phosphate compound is hydroxyapatite.
Claim 7
Dependent Claim
28 words
An artificial tooth according to claim 1 wherein said organic polymer is selected from the group consisting of polylactic acid, polyglycolic acid, polymethylmethacrylate, poly(trifluoroethyl methacrylate), polyethylene and polypropylene.
Claim 8
Dependent Claim
23 words
An artificial tooth according to claim 1 wherein an outer lateral side of said contacting member is formed by alternate projections and recesses.
Claim 9
Dependent Claim
19 words
An artificial tooth according to claim 7 wherein said alternate projections and recesses are arranged in a spiral form.
Claim 10
Dependent Claim
16 words
An artificial tooth according to claim 1 wherein said contacting member has a hemispherical bottom section.
Claim 11
Dependent Claim
16 words
An artificial tooth according to claim 1 wherein a crown is attached to said metal post.
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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |