Patent DE172182C successfully refreshed from Google Patents.
US4863382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retention system for dental prosthesis
Assignee: Individual
•
Filing: 1988-07-18
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Granted: 1989-09-05
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Expires: 2008-07-18
Abstract
Abstract A retention system for dental prosthesis includes an undercasting which is secured to a tooth. A pair of inner shell members are provided, one on each side of the undercasting. A prosthesis is mounted over the undercasting and includes a pair of outer shell members, each of which is disposed against the inner shell member to form a shroud. A resilient pin is seated in the shroud to provide for positive retention of the prosthesis to hold it in place while still permitting its removal.
Inventors
- 👤 Stanley A. Bookstaber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:52
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/273
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
A retention system for dental prosthesis comprising an undercasting, a pair of inner shell members secured to opposite sides of said undercasting, a prosthesis mounted over said undercasting, a pair of outer shell members mounted to the inner surface of said prosthesis, each of said outer shell members being disposed against a respective one of said inner shell members to form a shroud exposed at the lingual face of said prosthesis, and a resilient pin mounted in each of said shrouds to provide positive retention of said prosthesis.
Claim 2
Dependent Claim
88 words
A retention system for dental prosthesis comprising an undercasting, a pair of inner shell members secured to opposite sides of said undercasting, a prosthesis mounted over said undercasting, a pair of outer shell members mounted to the inner surface of said prosthesis, each of said outer shell members being disposed against a respective one of said inner shell members to form a shroud exposed at the lingual face of said prosthesis, and a resilient pin mounted in each of said shrouds to provide positive retention of said prosthesis.
Claim 3
Dependent Claim
48 words
The system of claim 1 wherein each of said outer shell members includes a seat at its buccal or labial end and a collar at its lingual end, each of said pins being seated at one end in said seat and at its other end in said collar.
Claim 4
Dependent Claim
17 words
The system of claim 2 wherein said seat and said collar are located beyond said inner shell.
Claim 5
Dependent Claim
40 words
The system of claim 3 wherein said shroud is of larger cross-sectional area than the cross-sectional area of said pin in the portion of said shroud including said inner shell to permit said pin to bow outwardly in said portion.
Claim 6
Dependent Claim
20 words
The system of claim 4 wherein said collar includes a counter bore, and said pin terminating in said counter bore.
Claim 7
Dependent Claim
33 words
The system of claim 5 wherein said counter bore is filled with a resin to shield said pin and provide a smooth continuous surface which blends with the outer surface of said prosthesis.
Claim 8
Dependent Claim
13 words
The system of claim 6 wherein said outer shell includes an anti-twist fin.
Claim 9
Dependent Claim
17 words
The system of claim 6 wherein a pair of peripheral flanges are provided on said inner shell.
Claim 10
Dependent Claim
15 words
The system of claim 6 wherein said outer shell is curved in its plan view.
Claim 11
Dependent Claim
14 words
The system of claim 6 wherein a vent hole is provided in said prosthesis.
Claim 12
Dependent Claim
11 words
The system of claim 10 wherein said prosthesis is a crown.
Claim 13
Dependent Claim
11 words
The system of claim 10 wherein said prosthesis is a bridge.
Claim 14
Dependent Claim
11 words
The system of claim 10 wherein said prosthesis is a partial.
Claim 15
Dependent Claim
12 words
The system of claim 10 wherein said prosthesis is an implant restoration.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |