US4969817A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Artificial teeth
Assignee: GC Corp
•
Filing: 1988-09-30
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Granted: 1990-11-13
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Expires: 2008-09-30
Abstract
Abstract An artificial tooth has a basal plane in which an areal ratio of a labial or buccal subplane to a lingual subplane is in a range of 10:1 to 1:10, and an angle that both subplanes make with a dental axis, i.e., an angle of retention, assumes a concave shape and is in a range equal to or larger than 45° to less than 180°. A retaining hole can be provided in the basal plane of the artificial tooth so as to further improve its performance.
Inventors
- 👤 Kenji Hiranuma
- 👤 Hiroshi Mori
- 👤 Akira Hasegawa
- 👤 Ikuo Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:33
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/08; A61C13/097; A61C13/087; A61C19/00; A61C19/04
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
79 words
An artificial tooth having a basal plane in which an areal ration of one of a labial and a buccal subplane to a lingual subplane is in a range of 10:1 to 1:10, and wherein an angle of retention between said one of said labial and buccal subplanes and the lingual subplane is equal to or larger than 45° and less than 180° and wherein a retaining hole is provided in said one of said labial and buccal subplanes.
Claim 2
Dependent Claim
79 words
An artificial tooth having a basal plane in which an areal ration of one of a labial and a buccal subplane to a lingual subplane is in a range of 10:1 to 1:10, and wherein an angle of retention between said one of said labial and buccal subplanes and the lingual subplane is equal to or larger than 45° and less than 180° and wherein a retaining hole is provided in said one of said labial and buccal subplanes.
Claim 3
Dependent Claim
29 words
An artificial tooth as claimed in claim 1, wherein said retaining hole provided therein assumes a concave shape defined by gently curved faces, and is provided with no undercut.
Claim 4
Dependent Claim
15 words
An artificial tooth as claimed in claim 2, which is accommodative to a front-tooth portion.
Claim 5
Dependent Claim
15 words
An artificial tooth as claimed in claim 3, which is formed of a synthetic resin.
Claim 6
Dependent Claim
20 words
An artificial tooth as claimed in claim 3, which is formed of a composite material of synthetic resins and ceramics.
Claim 7
Dependent Claim
15 words
An artificial tooth as claimed in claim 2, which is accommodative to a molar-tooth portion.
Claim 8
Dependent Claim
15 words
An artificial tooth as claimed in claim 6, which is formed of a synthetic resin.
Claim 9
Dependent Claim
20 words
An artificial tooth as claimed in claim 6, which is formed of a composite material of synthetic resins and ceramics.
Claim 10
Dependent Claim
15 words
An artificial tooth as claimed in claim 2, which is formed of a synthetic resin.
Claim 11
Dependent Claim
20 words
An artificial tooth as claimed in claim 2, which is formed of a composite material of synthetic resins and ceramics.
Claim 12
Dependent Claim
15 words
An artificial tooth as claimed in claim 1, which is accommodative to a front-tooth portion.
Claim 13
Dependent Claim
15 words
An artificial tooth as claimed in claim 11, which is formed of a synthetic resin.
Claim 14
Dependent Claim
20 words
An artificial tooth as claimed in claim 11, which is formed of a composite material of synthetic resins and ceramics.
Claim 15
Dependent Claim
15 words
An artificial tooth as claimed in claim 1, which is accommodative to a molar-tooth portion.
Claim 16
Dependent Claim
15 words
An artificial tooth as claimed in claim 14, which is formed of a synthetic resin.
Claim 17
Dependent Claim
20 words
An artificial tooth as claimed in claim 14, which is formed of a composite material of synthetic resins and ceramics.
Claim 18
Dependent Claim
15 words
An artificial tooth as claimed in claim 1, which is formed of a synthetic resin.
Claim 19
Dependent Claim
20 words
An artificial tooth as claimed in claim 1, which is formed of a composite material of synthetic resins and ceramics.
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) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |