US3553839A - Method and apparatus for positioning a dowel - Google Patents

Method and apparatus for positioning a dowel Download PDF

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US3553839A
US3553839A US3553839DA US3553839A US 3553839 A US3553839 A US 3553839A US 3553839D A US3553839D A US 3553839DA US 3553839 A US3553839 A US 3553839A
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dowel
impression
cavity
tooth
supports
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Kenneth W Gores
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KENNETH W GORES
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Kenneth W Gores
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C9/00Impression cups, i.e. impression trays; Impression methods
    • A61C9/002Means or methods for correctly replacing a dental model, e.g. dowel pins; Dowel pin positioning means or methods

Abstract

SUPPORTS ARE ERECTED AT OPPOSITE SIDES OF A TOOTH CAVITY IN A DENTAL IMPRESSION AND A BRIDGING MEMBER, FRICTIONALLY MOUNTED ON SAID SUPPORTS, SPANS THE CAVITY AND SUPPORTS A DOWEL IN SELECTED POSITIONING IN THE CAVITY WHILE A CAST IS BEING POURED AND SET.

Description

Jan. 12,1971 ;w

v I METHOD AND APPARATUS FOR POSITIONING A DOWEL Filed Sept. 9, 1969 IlIR Wm M MW W3. it H United States Patent 3,553,839 METHOD AND APPARATUS FOR POSITIONING A DOWEL Kenneth W. Gores, 1026 112th NE., Bellevue, Wash. 98004 Filed Sept. 9, 1969, Ser. No. 856,394 Int. Cl. A61c 13/00 US. CI. 32-11 Claims ABSTRACT OF THE DISCLOSURE Supports are erected at opposite sides of a tooth cavity in a dental impression and a bridging member, frictionally mounted on said supports, spans the cavity and supports a dowel in selected positioning in the cavity while a cast is being poured and set.

SUMMARY OF THE INVENTION A feature of the invention is the provision of a simple method of locating and positioning a dowel in a tooth cavity of a dental impression. The method is easily practiced to produce very accurate results without requiring the exercise of great skill on the part of the operator. A dental impression usually formed of rubberlike, semi-elastic material is normally created in a formretaining tray. A pair of supports are disposed upright in the impression material at opposite sides of atooth cavity in said impression. Preferably the supports are driven into the impression material. A flexible bridge member is frictionally mounted adjacent its ends on said supports. The flexible bridge member has at least one opening, in the preferred form of the invention, on its underside. A tapered dowel, to be embedded in stone or plaster cast in the tooth cavity, has its upper tapered end inserted firmly into said opening whereupon the dowel depends into the cavity. An initial pour of casting material is made to a depth sufficient to partially embrace the lower end of the dowel. Then the upright supports and bridge member are removed. The upper end of the dowel is capped with a soft plastic cup-like member. A second pour of casting material is then made to embed the dowel to or slightly above the dowel cap. When the stone is hardened, the dowel cap may be removed. The operator may then remove his cast model from the impression and cut into it from beneath to sever the dowelled tooth from the remainder of the model to the depth of the first casting. Then the operator strikes the exposed upper end of the tapered dowel causing the dowel to slip out of the second casting, and to cause the first portion case to separate as a tooth unit. The dowel insures that the tooth unit may be accurately returned to its normal position in the model.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of the dowel positioning apparatus;

FIGS. 2 and 3 illustrate, respectively, a dowel positioned according to this invention, and a dowel as initially cast in the dental impression.

FIG. 4 illustrates a dowel as prepared for a second casting;

FIG. 5 shows the two-part cast model about to be parted to separate a dowelled tooth unit; and

"Ice

FIG. 6 is a plan view of an impression tray showing the apparatus of this invention as in use.

DESCRIPTION OF THE INVENTION In an impression tray 10 having handle 11 is placed a quantity of rubber-like, moldable, elastomeric material. This is then introduced into a dental patients mouth and firmly pressed against the dentition of one or the other of his jaws. The result is a resilient dental impression 12, i.e. a negative, from which a plaster mold or model of the patients jaw and teeth may be reproduced. The usual practice is to fill the cavities and contours of the impression by pouring and vibrating a plaster mix throughout the impression. Modern dental practices make it desirable that individual teeth of the model be separable. For this purpose a dowel or pin is in the model so that, when the model has hardened, the operator by careful cutting may separate a particular tooth from the model; however, still retaining means whereby it may be accurately replaced. The single removable tooth model serves as a support or die around which artificial teeth, caps, crowns, and other prosthetic devices may be designed and produced. It is often necessary to remove and replace such a tooth model many times.

The practice of this invention involves the method of using apparatus of the nature shown in the FIG. 1 where there is a pair of sharp-pointed pins 14, 16, a bridging member 18, and a dowel 20. Preferably the pins 14, 16 are T-headed for easy manipulation in placing them in position in the impression 12.

A bridging member 22 is mounted adjacent its ends on pins 14, 16. Desirably member 22 is formed of plastic material, such as vinyl or the like, as a series of small, hollow cylinders joined in side-by-side relation. The cylinder passages provide several selective positions on pins 14, 16 and, from beneath dowel 20 may have its smaller end inserted. It is preferable that the bridge member 22 be mounted on one pin, say pin 14, farther from its sharpened end than is the case with pin 16.

The operator, upon superposing an assembly as shown in FIG. 1 over at tray 10 containing an impression 12, will initially insert the lower pin 14 into the impression margin. This establishes a pivot point. He may then swing the pin 16 (see FIG. 6) in an accurate path selecting an appropriate location in the opposite impression margin suitable to suspend the dowel 20 approximately at the axis of tooth cavity 30 in the impression. Thereupon both pins 14 and 16 are pressed deeper into the impression material so that they are held firmly erect. The operator may then adjust the vertical disposition of dowel 20 relative cavity 30 by raising or lowering bridge member 22 on pins 14, 16.

When the apparatus has been suitably positioned, as in FIG. 2, plaster is poured into cavity 30 to fill the same sufficiently to engage the depending knurled end 21 of dowel 20 as shown in FIG. 3. When this initial plaster model 34 has hardened, bridge 22 is disengaged from the upper end of dowel 20 and pins 14 and 16 are removed and laid aside.

Dowel 20 is next capped by a small plastic cup 32 as shown in FIG. 4 whereupon additional plaster 36 is poured or applied over model 34 as seen in FIG. 5, there tending to be a parting line 38 there-between. Desirably the second pour does not cover cap 32 which upon re- 3 moval will leave a small recess surrounding the upper tip of dowel 20.

The operator may then saw or otherwise cut away a dowelled tooth impression to a depth indicated by dotted line 40 in FIG. 5. A sharp blow as by punch 42. on dowel 20 will cause the tooth impression 40 to separate from the remainder of the model, the dowel 20 easily withdrawing by reason of its taper from cast portion 36.

While the foregoing discloses and describes the preferred form of the invention, it will be apparent to those skilled in the art that changes and modifications may be employed Without departing from the spirit of the invention.

What is claimed is:

1. The method of positioning a dowel in a tooth impression cavity of a dental impression, comprising:

erecting upright parallel pairs of supports rising from said impression at opposite sides of a selected tooth impression cavity;

slidably and frictionally mounting a bridging member on said supports in spanning relation above said cavity; and suspending a dowel from said bridge member into said cavity so as to facilitate vertical adjustment of said bridging member.

2. The method of claim 1 in which the upright supports are erected by driving the same into marginal portions of said dental impression external of said selected tooth impression cavity.

3. Apparatus for positioning a dowel pin relative to a tooth impression cavity of a dental impression, comprising:

a parallel pair of upright pins inserted into and supported by the dental impression material at opposite sides of a tooth impression cavity therein; and

a bridging member slidably mounted on and spanning between said upright pins traversing said cavity so as to be vertically adjustable relative to said cavity;

said bridge member having at least one socket opening to receive and support a dowel in depending relation between said pins, and into such tooth impression cavity.

4. Apparatus according to claim 3 in which said bridging member is formed of resilient material and there is a row of openings on its underside to variously receive and support a dowel.

5. Apparatus according to claim 4 in which the bridging member comprises a series of open-ended hollow cylinders joined in side-by-side sequential arrangement.

References Cited UNITED STATES PATENTS 6/1966 Kersten 249-205 9/1969 IStern et al 32-17

US3553839D 1969-09-09 1969-09-09 Method and apparatus for positioning a dowel Expired - Lifetime US3553839A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798772A (en) * 1971-10-16 1974-03-26 Eberhard Peter Cut-away model for dental prosthesis
US4001938A (en) * 1973-07-16 1977-01-11 Cooper Abraham J Dental restoration jig
US4129281A (en) * 1977-07-22 1978-12-12 Cooper Abraham J Dowel receiving core for casting dental restorations
US4229167A (en) * 1978-04-12 1980-10-21 Porceny Co., Ltd. Dowel pin setting instrument
US4240605A (en) * 1979-09-17 1980-12-23 Pennwalt Corporation Jig assembly for preparing dental impressions for casting
US4243389A (en) * 1979-12-11 1981-01-06 Eisner Jeffrey W Dental dowel pin placement apparatus
US4457709A (en) * 1983-03-09 1984-07-03 Moore Charles E Holding device for a dental dowel pin
US4940409A (en) * 1986-03-27 1990-07-10 Nordin Harald E Method and apparatus for making dental jaw models
US5569033A (en) * 1994-09-23 1996-10-29 Michael; Robert M. Pinned dental models and their preparation and use
GR1003058B (en) * 1997-06-11 1999-01-27 Θωμασ Γουλαρασ Dental technician's tool for the support and installation of the pin
US6050817A (en) * 1999-07-26 2000-04-18 S. Lekhovitser Model die ejector
US20100279254A1 (en) * 2006-09-28 2010-11-04 Dennis Joseph White Dental prosthesis fabrication

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798772A (en) * 1971-10-16 1974-03-26 Eberhard Peter Cut-away model for dental prosthesis
US4001938A (en) * 1973-07-16 1977-01-11 Cooper Abraham J Dental restoration jig
US4129281A (en) * 1977-07-22 1978-12-12 Cooper Abraham J Dowel receiving core for casting dental restorations
US4229167A (en) * 1978-04-12 1980-10-21 Porceny Co., Ltd. Dowel pin setting instrument
US4240605A (en) * 1979-09-17 1980-12-23 Pennwalt Corporation Jig assembly for preparing dental impressions for casting
US4243389A (en) * 1979-12-11 1981-01-06 Eisner Jeffrey W Dental dowel pin placement apparatus
US4457709A (en) * 1983-03-09 1984-07-03 Moore Charles E Holding device for a dental dowel pin
US4940409A (en) * 1986-03-27 1990-07-10 Nordin Harald E Method and apparatus for making dental jaw models
US5569033A (en) * 1994-09-23 1996-10-29 Michael; Robert M. Pinned dental models and their preparation and use
GR1003058B (en) * 1997-06-11 1999-01-27 Θωμασ Γουλαρασ Dental technician's tool for the support and installation of the pin
US6050817A (en) * 1999-07-26 2000-04-18 S. Lekhovitser Model die ejector
WO2001006948A1 (en) * 1999-07-26 2001-02-01 Lekhovitser, Svetlana Model die ejector
US20100279254A1 (en) * 2006-09-28 2010-11-04 Dennis Joseph White Dental prosthesis fabrication

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JPS5020790B1 (en) 1975-07-17

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