Patent US4189834A successfully refreshed from Google Patents.
US4189834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental reinforcing pins
Assignee: FAIRFAX DENTAL (IRELAND) Ltd
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Filing: 1977-06-08
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Granted: 1980-02-26
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Expires: 1997-06-08
Abstract
Abstract A dental reinforcing pin including a threaded portion, for self-tapping insertion in a bore formed in a tooth understructure, and a connecting portion formed integrally with the threaded portion. The connecting portion includes a shank, adapted for engagement in a dental handpiece, and a weakened portion intermediate the threaded portion and the connecting portion to permit shearing and separation of the connecting portion from the threaded portion when the pin is inserted to the depth of the bore.
Inventors
- 👤 Andrew J. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:16
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/30; A61C5/35
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
A dental anchoring device comprising a threaded portion for self-threading insertion in a bore formed in a tooth dentine, a connecting portion forming an integral unit with said threaded portion and having an elongated shank adapted for direct positive attachment in a powered dental hand-piece, and a weakened portion intermediate the threaded portion and one end of the connecting portion for permitting shearing and separation of the connecting portion from the threaded portion; the free end of the connecting portion having a flat portion and a part annular groove, whereby the connecting portion can be latched in a latching-type dental hand-piece to securely retain the dental anchoring device in the hand-piece without dropping therefrom and when said threaded portion is fully inserted in a bore said weakened portion shears to separate said connecting portion from said threaded portion.
Claim 2
Dependent Claim
138 words
A dental anchoring device comprising a threaded portion for self-threading insertion in a bore formed in a tooth dentine, a connecting portion forming an integral unit with said threaded portion and having an elongated shank adapted for direct positive attachment in a powered dental hand-piece, and a weakened portion intermediate the threaded portion and one end of the connecting portion for permitting shearing and separation of the connecting portion from the threaded portion; the free end of the connecting portion having a flat portion and a part annular groove, whereby the connecting portion can be latched in a latching-type dental hand-piece to securely retain the dental anchoring device in the hand-piece without dropping therefrom and when said threaded portion is fully inserted in a bore said weakened portion shears to separate said connecting portion from said threaded portion.
Claim 3
Dependent Claim
27 words
A dental reinforcing pin, according to claim 1, in which the weakened portion is a neck of smaller diameter than the root diameter of the threaded portion.
Claim 4
Dependent Claim
48 words
A dental reinforcing pin according to claim 2, in which the threaded portion is in two sections joined by a further neck, the diameter of the further neck being less than the diameter of the first-mentioned neck whereby shear will tend to occur first at the further neck.
Claim 5
Dependent Claim
20 words
A dental anchoring device according to claim 1, in which the shank has a circular cross-section substantially throughout its length.
Claim 6
Dependent Claim
25 words
A dental anchoring device as claimed in claim 1 in which the threaded portion and the connecting portion are formed as a single homogeneous piece.
References Cited (Backward Citations)
US2289785A
Cited
US2310409A
Cited
US3576073A
Cited
US3675328A
Cited
US3675329A
Cited
US3861043A
Cited
US3932939A
Cited
US3875665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |