Patent US4746294A successfully refreshed from Google Patents.
US4746294A
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US
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Cylindrical threaded pin for dental prosthesis implantations
Assignee: Individual
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Filing: 1987-01-30
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Granted: 1988-05-24
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Expires: 2007-01-30
Abstract
Abstract A threaded pin for implantation use in dentistry, comprising a cylindrical stem with an external thread near one end, a head for application of a tool at the other end and a point at the opposite end near the thread. The point has the same shape as the point of the milling cutter used to make the elongated hole in the bone in which the implantation is to be make. The dimensions of the thread are relatively small in comparison with the diameter of the stem to avoid exerting excessive pressure and cause damage to the bone as the pin is screwed thereinto.
Inventors
- 👤 Domenico Colombo
- 👤 Ugo Pasqualini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:00
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0018; A61C8/0022
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
In a cylindrical threaded pin for implantation use in dentistry for insertion in a bone tunnel made by a pointed milling cutter in a jaw-bone, said pin comprising an elognated cylindrical stem provided with a head at one end thereof and with an external thread upon said stem at a second end thereof, said stem being of a diameter to fit within the bone tunnel, the improvement wherein the depth of said thread is substantially 1/10 of the diameter of said stem; the included angle of said thread is substantially 35° defining a cutting thread for threading into and retainingly engaging the jawbone; the pitch of said thread is substantially the same as the diameter of said stem; and a downwardly extending point at said second end having a shape corresponding to the bit of said milling cutter.
Claim 2
Dependent Claim
138 words
In a cylindrical threaded pin for implantation use in dentistry for insertion in a bone tunnel made by a pointed milling cutter in a jaw-bone, said pin comprising an elognated cylindrical stem provided with a head at one end thereof and with an external thread upon said stem at a second end thereof, said stem being of a diameter to fit within the bone tunnel, the improvement wherein the depth of said thread is substantially 1/10 of the diameter of said stem; the included angle of said thread is substantially 35° defining a cutting thread for threading into and retainingly engaging the jawbone; the pitch of said thread is substantially the same as the diameter of said stem; and a downwardly extending point at said second end having a shape corresponding to the bit of said milling cutter.
Claim 3
Dependent Claim
32 words
A cylindrical threaded pin as defined in claim 1, and a stub having an axial bore slidably mounted on said stem and having a diameter corresponding to the diameter of said stem.
Claim 4
Dependent Claim
26 words
A cylindrical threaded pin as defined in claim 1, wherein the length of said point is substantially the same as the outside diameter of said pin.
References Cited (Backward Citations)
US29817A
Cited
US3449830A
Cited
US3579830A
Cited
USRE29817E
Cited
US3905109A
Cited
US4365958A
Cited
US4468200A
Cited
GB2143609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |