Patent US4828496A successfully refreshed from Google Patents.
US4828496A
Expired / Lapsed
US
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Endodontic core assembly
Assignee: Individual
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Filing: 1988-01-22
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Granted: 1989-05-09
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Expires: 2008-01-22
Abstract
Abstract Endodontic core and post are disclosed, forming an integral unit of which the post, adapted to be anchored in the respective root canal, is provided with, preferably, four wings perforated to allow passage of cement or the like through same in order to enhance the strength of embedding of the post in the root canal. The radial wings of the post are disposed each in a recess which is reamed by utilizing a special guiding post which is also a part of the present invention. In order to further enhance the strength of the bond between the core and the post in the respective root canal, an extension beam, preferably of a cross-shaped cross-sectional configuration, is adhesively secured to the free end of the post to form a "winged" extension of the post itself. The wings of the beam extension are also perforated for the same reason.
Inventors
- 👤 Michael P. Lococo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:54
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/30
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
97 words
Endodontic core assembly comprising, in combination: (a) a core; (b) a post forming an extension of the core and being integral with same; (c) said post comprising a solid, elongated, generally cylindrical central section and a plurality of winged sections protruding radially away form the central section over generally the entire length of the post, each winged section defining a longitudinal outer edge portion which, at any transverse reference plane perpendicular to the axis of the post, is more remote from the axis of the post than any other part of the post at that reference plane.
Claim 2
Dependent Claim
97 words
Endodontic core assembly comprising, in combination: (a) a core; (b) a post forming an extension of the core and being integral with same; (c) said post comprising a solid, elongated, generally cylindrical central section and a plurality of winged sections protruding radially away form the central section over generally the entire length of the post, each winged section defining a longitudinal outer edge portion which, at any transverse reference plane perpendicular to the axis of the post, is more remote from the axis of the post than any other part of the post at that reference plane.
Claim 3
Dependent Claim
44 words
Endodontic core assembly as claimed in claim 1, wherein each winged section is provided with a number of transverse passages for allowing a cement mixture to penetrate each winged section to improve the strength of anchoring of the post in a respective root canal.
Claim 4
Dependent Claim
52 words
Endodontic core assembly as claimed in claim 1, wherein said post is provided with extension stem mounting means, for fixedly securing to the post, generally coaxially therewith, an extension stem at a free end portion of the central section remote from the core, to thus provide an integral extension of the post.
Claim 5
Dependent Claim
49 words
Endodontic core assembly as claimed in claim 3, further comprising an extension stem fixedly secured to the central section at said mounting means and forming a generally coaxial extension of said post, whereby the length at which the core can be anchored in a respective root canal is increased.
Claim 6
Dependent Claim
25 words
Endodontic core assembly as claimed in claim 4, wherein said extension stem includes an elongated central portion and a plurality of generally radial wing sections.
Claim 7
Dependent Claim
38 words
Endodontic core assembly as claimed in claim 5, wherein said beam mounting means includes a recess in said free end portion of the central section portion, said recess having cross-sectional configuration complementary with that of said extension stem.
Claim 8
Dependent Claim
26 words
Endodontic core assembly as claimed in claim 6, wherein one end of said extension stem is inserted in said recess and is adhesively secured to same.
Claim 9
Dependent Claim
51 words
Endodontic core assembly as claimed in claim 5, wherein said radial wing sections of the beam extension member are provided with a number of transverse passages for allowing a cement mixture to penetrate each wing section to improve the strength of anchoring of the extension stem in a respective root canal.
Claim 10
Dependent Claim
47 words
Endodontic core assembly as claimed in claim 8, wherein each wing section of said post is provided with a number of transverse passages for allowing a cement mixture to penetrate each wing section to improve the strength of anchoring of the post in a respective root canal.
Claim 11
Dependent Claim
29 words
Endodontic core assembly as claimed in claim 8, wherein the extension stem has four winged sections disposed in a cross-shaped cross-sectional pattern at a 90° spacing from each other.
Claim 12
Dependent Claim
49 words
Endodontic core assembly as claimed in claim 8, wherein the extension stem has four wing sections disposed in a cross-shaped cross-sectional pattern at a 90° spacing from each other, said post also having four wing sections disposed in a cross-shaped cross-sectional pattern at a 90° spacing from each other.
Claim 13
Dependent Claim
24 words
Endodontic core assembly as claimed in claim 1, wherein each longitudinal outer edge portion extends continuously over generally the entire length of the post.
Claim 14
Dependent Claim
46 words
Endodontic core assembly as claimed in claim 12, wherein the surface of the solid central section between adjacent winged sections is smooth, whereby a continuous channel extending along the entire length of the post is formed between each pair of adjacent ones of the winged sections.
Claim 15
Dependent Claim
112 words
A kit for the production of an endodontic core comprising: (a) a core member including a core and a post forming a generally cylindrical extension of the core and being integral with same, said post comprising a solid central section and a plurality of winged sections protruding radially away from the central section and extending over generally the entire length of the post; (b) beam attachment means disposed at a free end portion of said central section, said free end portion being remote from the core and facing away from same; (c) extension beam means complementary with the beam attachment means for permanent securement of the beam means to said central section.
Claim 16
Dependent Claim
112 words
A kit for the production of an endodontic core comprising: (a) a core member including a core and a post forming a generally cylindrical extension of the core and being integral with same, said post comprising a solid central section and a plurality of winged sections protruding radially away from the central section and extending over generally the entire length of the post; (b) beam attachment means disposed at a free end portion of said central section, said free end portion being remote from the core and facing away from same; (c) extension beam means complementary with the beam attachment means for permanent securement of the beam means to said central section.
Claim 17
Dependent Claim
85 words
A kit as claimed in claim 14, wherein the extension beam means is a length of a rod having cross-sectional configuration comprised of a central section and a number of radial wings, said beam attachment means being a cutout in the free end portion of said central section complimentary with the cross-sectional configuration of said rod, whereby a length of the rod can be cut off and one end of the cut off piece can be inserted in the cutout and adhesively secured to same.
Claim 18
Dependent Claim
40 words
A kit as claimed in claim 15, wherein said radial wings have each the same width as measured radially of the elongation of the extension beam means, the wings being spaced from each other at a generally uniform angular spacing.
Claim 19
Dependent Claim
26 words
A kit as claimed in claim 16, comprising two or more of said extension beam means differing from each other in said width of the wings.
Claim 20
Dependent Claim
36 words
A kit as claimed in claim 15, wherein said wings are perforated to provide passages therein for cement or the like to improve the strength of anchoring of the beam means in a respective root canal.
Claim 21
Dependent Claim
34 words
A kit as claimed in claim 14, wherein there are four wing sections protruding radially away from the central section, said wing sections being spaced from each other at a generally uniform, 90° spacing.
Claim 22
Dependent Claim
27 words
A kit as claimed in claim 19, wherein the width of said wing sections as measure radially of the post is the same at each wing sections.
Claim 23
Dependent Claim
111 words
A kit as claimed in claim 20, further comprising a reamer guidance insert including an elongated, conical core having a major diameter end a minor diameter end, said core further having longitudinal grooves in its surface, the size and shape of the core being generally the same as that of the respective central section, said grooves being concavely rounded in cross-section and being spaced from each other at an angular spacing corresponding to that of the wing sections of the post, and handle means for manipulating the guidance insert into and out of a reamed root canal prior to the reaming of passages for receiving the wing sections of the post.
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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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |