US4302189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Denture retention
Assignee: The University of Sydney
•
Filing: 1980-03-26
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Granted: 1981-11-24
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Expires: 2000-03-26
Abstract
Abstract A denture is fitted with a U-shaped magnet element which provides for enhanced denture retention by coupling magnetically with a magnetizable element which is located in a decoronated tooth or dental implant in the mouth of a person to whom the denture is fitted. The magnet element is substantially totally enclosed within a base of the denture but pole caps are mounted to respective pole faces of the magnet element and are exposed to engage in abutting contact with the magnetizable element. The pole caps are formed from ferro-magnetic stainless steel and function to protect the magnet element from chemical attack and/or mechanical damage in the oral environment.
Inventors
- 👤 Barrie R. D. Gillings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:23
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/235
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
A denture comprising a base having a gum tissue conforming surface, at least one artificial tooth mounted to the base, and at least one magnet element located in the base; the magnet element comprising a generally U-shaped magnet of strongly magnetic material and having spaced-apart pole faces which are disposed in a common plane, the magnet element being substantially totally enclosed within the denture base and having very thin pole caps located on the respective pole faces thereof, the pole caps being exposed at the tissue conforming surface of the denture base for engaging in abutting contact with a magnetisable element when the denture is fitted to a wearer, and the pole caps being formed from a material which exhibits magnetic permeability and which is substantially resistant to corrosion by oral juices.
Claim 2
Dependent Claim
132 words
A denture comprising a base having a gum tissue conforming surface, at least one artificial tooth mounted to the base, and at least one magnet element located in the base; the magnet element comprising a generally U-shaped magnet of strongly magnetic material and having spaced-apart pole faces which are disposed in a common plane, the magnet element being substantially totally enclosed within the denture base and having very thin pole caps located on the respective pole faces thereof, the pole caps being exposed at the tissue conforming surface of the denture base for engaging in abutting contact with a magnetisable element when the denture is fitted to a wearer, and the pole caps being formed from a material which exhibits magnetic permeability and which is substantially resistant to corrosion by oral juices.
Claim 3
Dependent Claim
15 words
A denture as claimed in claim 1 wherein each pole cap comprises a ferro-magnetic material.
Claim 4
Dependent Claim
25 words
A denture as claimed in claim 1 wherein each pole cap is formed from ferro-magnetic stainless steel and is about 200 to 600 μm thick.
Claim 5
Dependent Claim
25 words
A denture as claimed in claim 3 wherein each pole cap is secured to its associated pole face of the magnet element by an adhesive.
Claim 6
Dependent Claim
45 words
A denture as claimed in claim 3 where the magnet pole faces have a cross-sectional area configured as a major sector of a circle and wherein each pole cap is formed with a lip which extends around an arcuate portion of the associated pole face.
Claim 7
Dependent Claim
65 words
A denture as claimed in claim 1 in combination with a said magnetisable element, the magnetisable element being formed from a ferro-magnetic material and being engagable by both of the pole caps of the associated magnet element, and the magnetisable element having a spigot portion for location in a support associated with the jawbone of a person who is to be fitted with the denture.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |