US3890710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental dowel pin positioning and aligning apparatus
Assignee: Individual
•
Filing: 1974-04-12
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Granted: 1975-06-24
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Expires: 1994-04-12
Abstract
Abstract A dowel pin holder and aligning apparatus is provided for aligning and retaining dowel pins in selected positions during a dental casting operation in making a positive replica of a tooth from a negative impression which is formed in an impression material. The apparatus consists of the supporting plate or base upon which is mounted a removable dental tray support or impression holder positioned to receive the dental impression in which the dowel pins are placed. A temporary dowel pin holder is provided above the tray. The temporary pin holder includes a substantially homogenous pierceable surface formed from a deformable retaining material within which the dowel pins remain once they are imbedded therein. The temporary retainer is supported on a slidable mounting element so that it can be moved with respect to the base and tray along an axis parallel to the axis of the pins. During use, each pin is placed in the desired location within a tooth impression in the tray. Relative sliding motion is then established between the tray and the temporary retainer while the dowel pin is held in a fixed position within its tooth impression. This forces the dowel pin into the pierceable surface of the deformable retaining material which then holds it in that position. Additional pins are subsequently imbedded one by one in the temporary retainer until all of the pins have been properly located. The retainer is then moved to a position in which all of the pins are simultaneously transferred to their proper positions within the impression and a layer of stone is cast around their lower ends. Another layer is then cast around the exposed portions of the pins.
Inventors
- 👤 Charles G Jaeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:05
CPC Classifications
A; A61; A61C; A61C9/00; A61C9/002
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
342 words
A dowel pin holding and aligning apparatus for aligning and retaining dowel pins in selected positions during a dental casting operation in making a positive replica of a tooth from a negative impression which is formed in an impression material, said apparatus comprising a supporting base, said base being adapted to support a dental tray for a dental impression in which the dowel pins are to be placed, a temporary dowel pin holder above said portion of the base adapted to support the tray, the temporary dowel pin holder comprising a deformable retaining material having a pierceable surface within which the dowel pins remain temporarily once they are embedded therein, a slidable mounting element supporting the temporary retainer on the base such that the temporary retaining element can be moved with respect to the base and tray along an axis parallel to the axis of the pins and parallel to the longitudinal axis of the negative impression of the teeth within which the pins are to be located, that is to say substantially normal to the plane of the tray on the base, each dowel pin including a needle-like piercing element, whereby during use each pin can be placed in desired locations within a tooth impression in the tray, relative sliding motion can then be established between the base and the temporary retainer while the dowel pin is held in position within its tooth impression thereby forcing the dowel pin into the deformable retaining material which then holds the dowel pin in place and locates each of said dowel pins a selected distance above the lower end of its tooth impression thereafter while each additional successive pin is embedded one after another in the temporarY retaining element until all of the pins have been properly located and the retainer being then movable to a position in which all of the pins are simultaneously transferred to their original positions within the negative tooth impressions of the tray for the casting of stone around the end of the pins within the negative tooth impressions.
Claim 2
Dependent Claim
342 words
A dowel pin holding and aligning apparatus for aligning and retaining dowel pins in selected positions during a dental casting operation in making a positive replica of a tooth from a negative impression which is formed in an impression material, said apparatus comprising a supporting base, said base being adapted to support a dental tray for a dental impression in which the dowel pins are to be placed, a temporary dowel pin holder above said portion of the base adapted to support the tray, the temporary dowel pin holder comprising a deformable retaining material having a pierceable surface within which the dowel pins remain temporarily once they are embedded therein, a slidable mounting element supporting the temporary retainer on the base such that the temporary retaining element can be moved with respect to the base and tray along an axis parallel to the axis of the pins and parallel to the longitudinal axis of the negative impression of the teeth within which the pins are to be located, that is to say substantially normal to the plane of the tray on the base, each dowel pin including a needle-like piercing element, whereby during use each pin can be placed in desired locations within a tooth impression in the tray, relative sliding motion can then be established between the base and the temporary retainer while the dowel pin is held in position within its tooth impression thereby forcing the dowel pin into the deformable retaining material which then holds the dowel pin in place and locates each of said dowel pins a selected distance above the lower end of its tooth impression thereafter while each additional successive pin is embedded one after another in the temporarY retaining element until all of the pins have been properly located and the retainer being then movable to a position in which all of the pins are simultaneously transferred to their original positions within the negative tooth impressions of the tray for the casting of stone around the end of the pins within the negative tooth impressions.
Claim 3
Dependent Claim
70 words
The apparatus of claim 1 wherein the slideable mounting element is a rod slideable within a tube, a stop means is operatively connected between the temporary dowel pin holder and the base for limiting the movement of the holder and the pins in the direction of the base, said stop means comprises a collar on the rod with a releasable retaining means for selectively changing the position of the collar.
Claim 4
Dependent Claim
20 words
The apparatus of claim 1 wherein a resiliant element is provided for yieldably biasing the holder upwardly from the base.
Claim 5
Dependent Claim
18 words
The apparatus of claim 1 wherein the pin holder comprises a cellular material composed of plastic resinous foam.
Claim 6
Dependent Claim
44 words
The apparatus of claim 1 wherein the pins are temporarily held in place with a grasping tool and the grasping tool is supported upon a bracket secured to the base and located above the tray when the tray is in place upon the base.
Claim 7
Dependent Claim
53 words
The apparatus of claim 5 wherein the bracket comprises a first arm member pivoted to the base and extending laterally therefrom, a vertically disposed second arm member at the free end of the first arm and a support plate at the free end of the second arm member for supporting the grasping tool.
Claim 8
Dependent Claim
25 words
The apparatus of claim 6 wherein the supporting plate is made of a magnetic material to securely retain the grasping tool in close contact therewith.
Claim 9
Dependent Claim
28 words
The apparatus of claim 7 wherein the first arm member is pivoted to the base for pivotal movement on an axis normal to the plane of the tray.
Claim 10
Dependent Claim
64 words
The apparatus of claim 1 wherein a tray holding plate is removably mounted on the top surface of the base, the tray holding plate having indexing means for locating it removably in a predetermined position relative to the base whereby it can be removed and replaced periodically to its exact original position and a deformable mounting medium on the plate to support the tray.
Claim 11
Dependent Claim
30 words
The apparatus of claim 5 wherein the supporting plate is vertically adjustable to selected positions to allow the position of the grasping means to be elevated or lowered as needed.
Claim 12
Dependent Claim
27 words
The apparatus of claim 8 wherein the length of the second arm member is adjustable and means for releasably locking the second arm member at selected lengths.
References Cited (Backward Citations)
US3650032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |