US4253829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental device and method for replacing lost tooth structure
Assignee: Individual
•
Filing: 1979-02-21
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Granted: 1981-03-03
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Expires: 1999-02-21
Abstract
Abstract A dental device and method useful in the restoration of a tooth having extensive clinical crown loss, characterized by a multisize core form blank which may be easily and quickly sized to fit any one of a plurality of tooth sizes. The blank is in the shape of a hollow generally conical body having a converging continuous side wall defining an interior cavity for receipt of a hardenable material and is severable substantially along any one of a plurality of planes normal to the axis of the blank to produce a core form for any particular tooth size.
Inventors
- 👤 William H. Adelberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:06
CPC Classifications
A; A61; A61C; A61C5/00; A61C13/00; A61C13/225; A61C13/30; A61C5/50; A61C5/80
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
147 words
A dental core form device for the preparation of a core for a crown on a prepared remaining tooth stub having extensive clinical crown loss, said device comprising a hollow conical blank having tapered continuous sidewall means severable substantially along any one of a plurality of planes substantially normal to the apical axis of said blank to produce a core form having an open gingival aspect with a transverse cross-sectional size and shape adapted to surround and to conform to the tooth stub when installed thereon and an interior cavity adapted to receive a hardenable material and to shape such hardenable material to a desired final form, said tapered sidewall means being adapted to conform to the tooth stub and limit by a binding action the movement of the core form over the tooth stub to obtain proper seating of the core form on the tooth stub.
Claim 2
Dependent Claim
147 words
A dental core form device for the preparation of a core for a crown on a prepared remaining tooth stub having extensive clinical crown loss, said device comprising a hollow conical blank having tapered continuous sidewall means severable substantially along any one of a plurality of planes substantially normal to the apical axis of said blank to produce a core form having an open gingival aspect with a transverse cross-sectional size and shape adapted to surround and to conform to the tooth stub when installed thereon and an interior cavity adapted to receive a hardenable material and to shape such hardenable material to a desired final form, said tapered sidewall means being adapted to conform to the tooth stub and limit by a binding action the movement of the core form over the tooth stub to obtain proper seating of the core form on the tooth stub.
Claim 3
Dependent Claim
24 words
The device of claim 1 comprising limiting means for defining a height of said interior cavity to provide a desired truncated conical final form.
Claim 4
Dependent Claim
60 words
The device of claim 2 wherein said limiting means comprises said blank being severable substantially along another of said plurality of planes substantially parallel to and spaced from said one of said plurality of planes to form an open occlusal aspect of said core form having a cross-sectional size less than that of said gingival aspect of said core form.
Claim 5
Dependent Claim
33 words
The device of claim 2 wherein said limiting means comprises a conical insert receivable in the apical end of said blank, said insert being sized to limit the height of said interior cavity.
Claim 6
Dependent Claim
37 words
The device of claim 4 comprising a conical insert blank which is severable substantially along a plane substantially normal to its apical axis to produce said conical insert of a desired size for the tooth being restored.
Claim 7
Dependent Claim
15 words
The device of claim 1 wherein said blank is made of a thin flexible material.
Claim 8
Dependent Claim
40 words
The device of claim 6 wherein said blank has facial, lingual and proximal sides, and said facial and lingual sides at said gingival aspect are festooned with a contour corresponding generally to the cervical line of the tooth being restored.
Claim 9
Dependent Claim
36 words
The device of claim 7 wherein said blank is capable of being squeezed with the proximal sides being urged towards one another and then severable when in such squeezed state to form said festooned gingival aspect.
Claim 10
Dependent Claim
30 words
The device of claim 2 wherein said limiting means comprises an apex stop for attachment to said core form whereby the same serves as a handle for said core form.
Claim 11
Dependent Claim
21 words
The device of claim 9 wherein said core form may be embedded in said apex stop to attach the same thereto.
Claim 12
Dependent Claim
19 words
The device of claim 1 wherein said sidewall has a thickness of about 0.025 cm. to about 0.03 cm.
Claim 13
Dependent Claim
22 words
The device of claim 11 wherein said blank is about 2.1 cm. long and has a greatest diameter of about 1.2 cm.
Claim 14
Independent Claim
31 words
The device of any one of the claims 1-8 wherein said sidewall has facial, lingual and proximal sides and said facial and lingual sides are, respectively, slightly longitudinally convex and concave.
Claim 15
Dependent Claim
59 words
The device of claim 1 wherein said sidewall has facial, lingual and proximal sides and said facial and lingual sides are, respectively, slightly longitudinally convex and concave, and at least one of said facial and lingual sides has a raised limiting ridge running longitudinally therealong for engaging the opposing tooth to facilitate proper spacing of the core form therefrom.
Claim 16
Dependent Claim
136 words
A multisize core form blank which may be sized to produce a core form for any one of a plurality of sizes of tooth stubs in the restoration of badly decayed or damaged teeth, said blank comprising a hollow generally conical body having a larger diameter base end, a small diameter apex end and a converging continuous sidewall extending from said base end to said apex end with facial, lingual and interproximal sides defining an interior cavity adapted to receive a hardenable composition and being severable substantially along any one of a plurality of planes substantially normal to the longitudinal axis of said body to produce a core form having an open gingival aspect opposite said apex end with cross-sectional size and shape to surround and conform to the tooth stub of such any one size.
Claim 17
Dependent Claim
136 words
A multisize core form blank which may be sized to produce a core form for any one of a plurality of sizes of tooth stubs in the restoration of badly decayed or damaged teeth, said blank comprising a hollow generally conical body having a larger diameter base end, a small diameter apex end and a converging continuous sidewall extending from said base end to said apex end with facial, lingual and interproximal sides defining an interior cavity adapted to receive a hardenable composition and being severable substantially along any one of a plurality of planes substantially normal to the longitudinal axis of said body to produce a core form having an open gingival aspect opposite said apex end with cross-sectional size and shape to surround and conform to the tooth stub of such any one size.
Claim 18
Independent Claim
154 words
A method of preparing a core for a crown on the remaining stub of a tooth, comprising the steps of: a. preparing the tooth for receiving the core, b. providing a dental device in the form of a thin walled, flexible, hollow generally conical blank having continuous converging sidewalls defining an interior cavity adapted to receive and to shape hardenable material, c. severing the blank substantially along a plane substantially normal to the apical axis thereof to produce a core form having an open gingival aspect and a cross-sectional shape and size adapted for surrounding and conforming to the tooth stub, d. filling the core form with a hardenable material, e. locating the core form filled with hardenable material over the tooth stub with the gingival aspect thereof surrounding and conforming to the tooth stub, f. allowing the material to harden, and g. removing the core form from the tooth stub and hardened material.
Claim 19
Independent Claim
154 words
A method of preparing a core for a crown on the remaining stub of a tooth, comprising the steps of: a. preparing the tooth for receiving the core, b. providing a dental device in the form of a thin walled, flexible, hollow generally conical blank having continuous converging sidewalls defining an interior cavity adapted to receive and to shape hardenable material, c. severing the blank substantially along a plane substantially normal to the apical axis thereof to produce a core form having an open gingival aspect and a cross-sectional shape and size adapted for surrounding and conforming to the tooth stub, d. filling the core form with a hardenable material, e. locating the core form filled with hardenable material over the tooth stub with the gingival aspect thereof surrounding and conforming to the tooth stub, f. allowing the material to harden, and g. removing the core form from the tooth stub and hardened material.
Claim 20
Dependent Claim
33 words
The method of claim 16 wherein said step of preparing comprises root canal treatment of the tooth stub, obturation of the root canal, and insertion of a sized post into a root canal.
Claim 21
Dependent Claim
31 words
The method of claim 17 wherein said step of preparing comprises embedding pins into the remaining tooth structure with the pins projecting into the space to be occupied by the core.
Claim 22
Dependent Claim
31 words
The method of claim 16 comprising the step of severing the blank substantially along another plane substantially normal to the apical axis to define an occlusal aspect on the core form.
Claim 23
Dependent Claim
39 words
The method of claim 19 comprising the step of attaching an apex stop against the core form at the occlusal end thereof and applying pressure to such apex stop to firmly seat the core form on the tooth stub.
Claim 24
Dependent Claim
23 words
The method of claim 20 wherein the core form is attached to the apex stop by embedding the same in the apex stop.
Claim 25
Dependent Claim
24 words
The method of claim 16 comprising the step of inserting a conical insert into the blank to limit the height of the interior cavity.
Claim 26
Dependent Claim
33 words
The method of claim 16 wherein the hardenable material is a restorative material and comprising the steps of finish grinding the restorative material after removal of the core form from the tooth stub.
Claim 27
Dependent Claim
44 words
The method of claim 17 wherein the hardened material and embedded post form a core pattern and comprising the steps of removing the core pattern, casting a core and post, and then reinserting and cementing the casting core and post into the tooth stub.
Claim 28
Dependent Claim
65 words
The method of claim 24 comprising the steps of providing an apex stop having an opening therein, securing the apex stop to the core form at the occlusal aspect thereof with the post projecting through the opening in the apex stop, applying pressure to the apex stop to seat the core form, and using the projecting portion of the post as a sprue during casting.
Claim 29
Dependent Claim
17 words
The method of claim 16 comprising the step of fitting and securing a crown to the core.
Claim 30
Dependent Claim
27 words
The method of claim 16 wherein the sidewall has facial, lingual and proximal sides and the facial and lingual sides are, respectively, slightly longitudinally convex and concave.
Claim 31
Dependent Claim
44 words
The method of claim 27 wherein at least one of the facial and lingual sides has a raised limiting ridge running longitudinally therealong, and comprising the step of using the limiting ridge to facilitate proper spacing of the core form from an opposing tooth.
Claim 32
Dependent Claim
26 words
The device of claim 1 wherein said blank includes index marking means for aiding the dentist in selecting said any one of a plurality of planes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |