US4334865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental obturation screw
Assignee: Individual
•
Filing: 1980-10-30
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Granted: 1982-06-15
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Expires: 2000-10-30
Abstract
Abstract A dental obturation screw is disclosed which comprises a threaded rod and a screw head allowing to actuate the screw and to fasten thereon an articial tooth or tooth part. The screw has a bearing part of convex, axially symmetrical shape which is adapted to rest on a corresponding bearing surface of the part of a natural tooth to be obturated.
Inventors
- 👤 Jean-Pierre Borle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:27
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/30; A61C3/00; A61C3/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A dental obturation screw for inserting in the root canal of a natural tooth, said screw having a threaded cylindrical rod and a screw head, said screw head comprising a crown part allowing to actuate the screw and to fasten thereon an artificial tooth part, and comprising a solid uninterrupted bearing part of convex shape symmetrically arranged about the screw axis between said threaded rod and said crown part and having a greatest diameter substantially greater than the diameter of the threaded rod, whereby said bearing part is adapted to rest on a corresponding bearing surface to obturate the root canal of the natural tooth.
Claim 2
Dependent Claim
105 words
A dental obturation screw for inserting in the root canal of a natural tooth, said screw having a threaded cylindrical rod and a screw head, said screw head comprising a crown part allowing to actuate the screw and to fasten thereon an artificial tooth part, and comprising a solid uninterrupted bearing part of convex shape symmetrically arranged about the screw axis between said threaded rod and said crown part and having a greatest diameter substantially greater than the diameter of the threaded rod, whereby said bearing part is adapted to rest on a corresponding bearing surface to obturate the root canal of the natural tooth.
Claim 3
Dependent Claim
20 words
A dental obturation screw as claimed in claim 1, wherein said bearing part has the shape of a spherical segment.
Claim 4
Dependent Claim
35 words
A dental obturation screw as claimed in claim 2, wherein said crown part comprises a milled cylindrical actuating part and a part forming an annular groove between said cylindrical actuating part and said bearing part.
Claim 5
Dependent Claim
48 words
A dental obturation screw as claimed in claim 1, wherein said convex shape of said bearing part is in axial direction at least as high as a corresponding recess of same shape in the remaining part of a natural tooth, between the greatest and the smallest diameter thereof.
Claim 6
Dependent Claim
60 words
A dental obturation screw as claimed in claim 1, wherein said convex shape of said bearing part has between its greatest and its smallest diameter the same height as a corresponding part of same shape of a diamond reamer, and the length of said threaded rod is less than the length of a corresponding cutting part of said diamond reamer.
References Cited (Backward Citations)
US430522A
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DE464497C
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US1285785A
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US2411758A
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US2655724A
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FR1058354A
Cited
US3085334A
Cited
US3672058A
Cited
US4185383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |