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WO1989006114A1 - Dispositif d'alignement de modeles dentaires - Google Patents

Dispositif d'alignement de modeles dentaires Download PDF

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Publication number
WO1989006114A1
WO1989006114A1 PCT/US1988/004707 US8804707W WO8906114A1 WO 1989006114 A1 WO1989006114 A1 WO 1989006114A1 US 8804707 W US8804707 W US 8804707W WO 8906114 A1 WO8906114 A1 WO 8906114A1
Authority
WO
WIPO (PCT)
Prior art keywords
gasket
base cast
dowel pin
dental model
cast
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1988/004707
Other languages
English (en)
Inventor
Thomas J. Mayclin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO1989006114A1 publication Critical patent/WO1989006114A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C9/00—Impression cups, i.e. impression trays; Impression methods
    • A61C9/002—Means or methods for correctly replacing a dental model, e.g. dowel pins; Dowel pin positioning means or methods

Definitions

  • the present invention relates generally to prosthodontic casts, and more particularly to an alignment device for aligning a dental model cast or portions thereof in a precise position relative to a base cast.
  • a dental model upon which dental hardware may be fabricated to fit a patient's teeth.
  • a dental model may be made by first taking a negative impression of a patient's teeth and gums and then filling the model with a suitable casting material. After the casting material hardens, dowel pins are rigidly mounted in the dental model and a base cast is formed over the dental model. When the base cast is hardened, portions of the dental model may be separated by vertical cuts through the dental model. This enables selected portions of the dental model to be removed from the base cast so that they can be easily worked on.
  • dowel pins have been utilized to removably mount and rotationally align a dental model on a base cast.
  • One such mounting device includes two parts. The first part has two differently sized dowel pins extending therefrom, and is mountable in a dental model with the dowel pins extending outwardly. The second part is mountable in a base cast and carries two appropriately sized openings for receiving the dowel pins.
  • Another prior art device similarly comprises a first metal part having two dowel pins, the dowel pins being receivable in a channel of a second metal part carried by a base cast.
  • One of the dowel pins of the device is significantly shorter than the other.
  • a similar device includes two separate dowel pins of different diameters carried by the dental model, the pins extending from the model to be received within two separate sleeves carried by a base cast.
  • Another prior art device comprises a single metal piece carried by a dental model having two dowel pins extending outwardly from the dental model to be received directly within two holes carried by the stone of a base cast.
  • Yet another prior art device includes two separate pins.
  • One metal pin is carried by the dental model and received within an opening carried by the stone of a base cast.
  • the other pin is made of plastic and is carried by the base cast extending outwardly, generally parallel to the pin carried by the model, the pin being receivable in an opening carried by the dental model.
  • the present invention relates to a dental alignment device for orienting a dental model or portion thereof with respect to a base cast.
  • the dental model employed is of the type having a dowel pin extending from a prosthodontic cast.
  • the alignment device comprises a collar portion adapted to receive the dowel pin and an alignment means extending radially outwardly of the collar and being receivable in a complementary depression formed in the base cast.
  • the alignment means functions to rotationally align the dental model with respect to the base cast when the model is mounted thereon.
  • the alignment device may include a gasket means carried by the base cast to provide a snug fit between the dowel pin and the base cast, thereby preventing fluid cast material from entering an area around the periphery of the pin inside the gasket means.
  • Figure l is an exploded perspective view cf the dental model alignment device of the invention.
  • Figure 2 is a fragmented cross-sectional view showing the engagement between the dental model, dowel pin, alignment means, and the base cast;
  • Figure 3 is a fragmented cross-sectional view showing the engagement between the dental model, dowel pin, alignment means, gasket, and the base cast;
  • Figure 4 is a perspective view of an alternative embodiment of the alignment means of the invention.
  • Figure 5 is a perspective view of an alternative embodiment of the alignment means of the invention.
  • Figure 6 is a perspective view of an alternative embodiment of the alignment means of the invention
  • Figure 7 is a perspective view of an alternative embodiment of the alignment means of the invention
  • Figure 8 is an exploded perspective view of the dental model alignment device of the invention.
  • Figure 9 is an exploded perspective view of the dental model alignment device of the invention utilizing an alternative embodiment of the alignment means.
  • Figure 10 is cross-sectional view of the dowel pin and gasket means of Figure 2 taken along line 10-10 thereof.
  • Figure 1 shows the alignment device (20) of the invention as it is mounted on a dowel pin (70) carried by a dental model (41).
  • the alignment device (20) includes a collar portion (21) for receiving therein the dowel pin (70), and alignment means (23) extending radially therefrom.
  • the collar (21), as shown in Figures 4-7, includes a desirably circular (or other suitably shaped) opening (22) having an axis extending through the collar (21) generally perpendicular to a flat upper surface (27) of the collar (21), the opening (22) being sized to closely receive a dowel pin (70).
  • the opening (22) includes a slight radially inwardly extending flange (24), shown in Figures 8 and 9, carried adjacent the lower surface (28) of the alignment device (20) for sealingly engaging the dowel pin (70) about its periphery. This flange is particularly useful in accommodating dowel pins (70) of slightly varying diameters.
  • the radially extending alignment means (23) may comprise a variety of suitable configura ions, as shown in Figures 4-7, but desirably includes one or two portions extending radially outwardly of the collar portion (21). Extending " upwardly from at least one of the radially outwardly extending portions, generally parallel to the axis of the central opening (22), is at least one protrusion (25) having parallel or preferably upwardly converging walls (29).
  • FIG 4 An especially preferred embodiment of the alignment device (20) is shown in Figure 4.
  • the alignment means (23) has tapered sides (26) defining the upwardly extending protrusions (25).
  • Figures 5, 6 and 7 show alternative embodiments of the invention to fit dental model pieces (41) of different shapes and spacings.
  • the alignment device (20) shown in Figure 5 is somewhat wider and is suitable for relatively wider spacing of model portions (41), carrying the protu ⁇ ions (25) on the upper surface (27) of the device.
  • Figure 6 shows an alternative embodiment of the invention wherein the alignment means (23) has one end with tapered side walls (26) and an upwardly directed protrusion (25) and another end with only a short extension (30).
  • the short extension (30) generally would be oriented inwardly toward the center of a curve defined by the teeth (44) of a model (41), thereby permitting quite close spacing of dowel pins (70).
  • Figure 7 shows a similar embodiment incorporating the basic design of Figure 5.
  • the upwardly extending protusions might also comprise hemi-spherical protusions, cylinders with generally vertical walls, or other similar configurations.
  • the alignment means might include a depression rather than a protrusion, thereby forming a complimentary protrusion in the base cast.
  • the alignment device (20) is used cooperatively with a dowel pin (70) such as that shown in Figures 8 and 9.
  • the dowel pin (70) typically comprises a generally elongated Frusto-conical pin, usually metal, having a first end (72) of slightly smaller diameter which may be knurled for enhanced engagement in the stone of a dental model (41). Spaced a distance from the first end (72) is a shoulder (71) extending radially outwardly, the shoulder (71) being a transition between the narrow knurled portion fixed in the dental model (41) and the wide end of the Frusto conical portion which is removably receivable in the base cast (42).
  • the wider portion (73) tapers inwardly toward the second end of the pin to facilitate such removal, and may include a flat side (74) to largely prevent the pin (70) from rotating with respect to the base cast (42).
  • the device of the invention also may include a gasket (50), preferably formed of flexible plastic, having a generally cylindrical shape and a central opening (57) extending axially therethrough.
  • the gasket (50) preferably includes first and second ends (53, 54), an outer wall (51) which preferably tapers inwardly toward the first end (53), and an inner wall (52) which is generally cylindrical.
  • the second end (54) preferably includes a circular flange (55) extending radially outwardly of the outer surface (51) of the gasket (50) and radially inwardly of the inner surface (52) of the gasket (50).
  • the flange (55) extends about the entire periphery of the second gasket end (54).
  • the flange (55) may, however, include a pair of flat surfaces (58, 59) oriented generally parallel to the axis of the opening (57), and generally parallel to each other on opposite sides of the gasket (50). These flat surfaces (58, 59) enable a plurality of similar gaskets (50) to be spaced more closely to one another.
  • the inwardly directed portion of the flange includes an inwardly directed sealing surface (56) which converges radially inwardly toward the second end (54) of the gasket (50) to sealingly engage the peripheral surfaces of a dowel pin (70).
  • the gasket (50) is included to prevent poured stone from entering an area around the periphery of the pin (70) adjacent the gasket wall (52) .
  • the dental model (41) and base cast (42) to be utilized with the device of the invention is made generally by the following procedure, which is well known in the art.
  • a negative impression is made of a patient's teeth and gums.
  • a suitable, accurate hardening stone-like material is poured and vibrated into the impression to a depth of approximately three-fourths of an inch to form the dental model (41).
  • the dental model (41) is then drilled with a precision drilling machine to form holes (45) having a predetermined location, depth and diameter.
  • the number of holes (45) that are drilled are determined by the spacing and location of the teeth (44) on the dental model (41).
  • the holes (45) are either steam cleaned or blown out with compressed air to remove any dust or particles of stone.
  • Dowel pins (70) are then cemented into the holes (45) following the procedure disclosed below.
  • the knurled end (72) of the dowel pin (70) is inserted into the opening (22) of the alignment collar (21) with the protrusions (25) on the alignment device (20) directed toward the tapered end (73) of the dowel pin.
  • the alignment device (20) is pressed firmly onto the dowel pin (70) until its flat upper surface (27) abuts the shoulder (71) of the dowel pin (70).
  • a suitable adhesive such as cynoacrylate is applied to the knurled end (72) of the pin (70) and to the lower surface (28) of the alignment device (20).
  • the knurled end (72) of the pin (70) is then inserted firmly and completely into the opening (45) in the dental model (41) with the lower surface (28) of the alignment device (20) firmly contacting the exposed surface of the dental model (41). The cement is then allowed to dry. Any number of dowel pins (70) may be mounted in this manner.
  • each gasket (50) placed on a pin (70) is color coded to match the color of its corresponding alignment device (20). This feature enables a user to easily determine which dental model pin (70) goes in which complimentary depression (43) of the base cast.
  • the areas of the dental model (41) that are to be made removable from the base cast (42) are coated on the flat surface containing the dowel pins (70) with a special separating medium which prevents a second layer of stone from adhering to the dental model (41) .
  • a second layer of stone is poured and vibrated onto the dental model (41) to a depth above the protruding ends of the pins (70) to form the base cast (42).
  • the excess stone is trimmed and the exposed bottom surface of the second layer is ground flat to expose the ends of the embedded dowel pins (70).
  • the dental model portions (41) and the base cast (42) are shown in Figure 1.
  • the alignment device (20) is configured and arranged to engage a complimentary depression (43) carried by the base cast (42), corresponding to its impression formed when the second layer of stone is poured over the dental model (41).
  • a complimentary depression (43) carried by the base cast (42) corresponding to its impression formed when the second layer of stone is poured over the dental model (41).
  • the alignment means (23) prevents the pin (70) from rotating or moving laterally with respect to the base cast (42) .
  • the (42) may contain a gasket (50) as previously described to grip the dowel pin (70) and retain the dental model (41) firmly in a desired position upon the base cast (42).
  • Dental models (41) are generally used for the fabrication of dental appliances such as caps, crowns, and bridges. These appliances may be fabricated directly on the dental model (41) and then applied to the teeth of the patient. In the fabrication process, the individual portions of the dental model (41) are removed and replaced to facilitate accessibility to particular teeth (44). The importance of replacing the dental model (41) exactly and firmly in a desired position upon the base cast (42) becomes apparent when dental work is to be performed on adjacent teeth. In order to successfully perform this type of work, the dental model portions (41) must be held firmly and precisely in a position corresponding accurately to the positioning of the respective teeth within the mouth of the patient.
  • the dental apparatus being fabricated upon the model (41) may not fit the patient's teeth.
  • the device of the invention enables particular portions of the dental model (41) to be removed from the base cast (42) and then easily replaced in their respective positions accurately in alignment with one another.

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

Un dispositif (20) d'alignement et de montage détachable d'un modèle dentaire (41) ou d'une partie de celui-ci sur un moule de base (42) comprend une bague d'alignement (21) susceptible d'être fermement attachée à une goupille de serrage (70) et à un modèle dentaire (41), leur combinaison pouvant se loger dans une dépression complémentaire du moule de base (42) afin d'aligner et de retenir le modèle dentaire, l'empêchant de pivoter ou de se déplacer transversalement par rapport au moule de base lorsque les parties sont coopérativement assemblées. Un joint d'étanchéité (50) peut être incorporé au moule de base afin d'améliorer davantage l'enclenchement entre la goupille de serrage et le moule de base.
PCT/US1988/004707 1987-12-31 1988-12-30 Dispositif d'alignement de modeles dentaires Ceased WO1989006114A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14007387A 1987-12-31 1987-12-31
US140,073 1987-12-31

Publications (1)

Publication Number Publication Date
WO1989006114A1 true WO1989006114A1 (fr) 1989-07-13

Family

ID=22489629

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1988/004707 Ceased WO1989006114A1 (fr) 1987-12-31 1988-12-30 Dispositif d'alignement de modeles dentaires

Country Status (1)

Country Link
WO (1) WO1989006114A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990011056A1 (fr) * 1989-03-28 1990-10-04 Pierre Berceaux Positionneur prothetique pour l'art dentaire
FR2651673A1 (fr) * 1989-09-14 1991-03-15 Berceaux Pierre Positionneur prothetique pour l'art dentaire.
DE4127183A1 (de) * 1991-08-16 1993-02-18 Zeiser Manfred P Halteelement zum befestigen von modellteilen beim herstellen von zahnersatz

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153283A (en) * 1962-01-12 1964-10-20 Weissman Bernard Dowel pin assembly for dental dies
US3470614A (en) * 1966-10-17 1969-10-07 Maurice W Kelly Method and apparatus for making dental die
US3798772A (en) * 1971-10-16 1974-03-26 Eberhard Peter Cut-away model for dental prosthesis
US4300884A (en) * 1980-02-28 1981-11-17 Hector Camacho Casting collar for dental impression tray
US4363625A (en) * 1980-08-29 1982-12-14 Der Avanessian Mesrop Dental technicians tool and tool retainer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3153283A (en) * 1962-01-12 1964-10-20 Weissman Bernard Dowel pin assembly for dental dies
US3470614A (en) * 1966-10-17 1969-10-07 Maurice W Kelly Method and apparatus for making dental die
US3798772A (en) * 1971-10-16 1974-03-26 Eberhard Peter Cut-away model for dental prosthesis
US4300884A (en) * 1980-02-28 1981-11-17 Hector Camacho Casting collar for dental impression tray
US4363625A (en) * 1980-08-29 1982-12-14 Der Avanessian Mesrop Dental technicians tool and tool retainer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990011056A1 (fr) * 1989-03-28 1990-10-04 Pierre Berceaux Positionneur prothetique pour l'art dentaire
US5125833A (en) * 1989-03-28 1992-06-30 Pierre Berceaux Prosthetic positioning device for dentistry
FR2651673A1 (fr) * 1989-09-14 1991-03-15 Berceaux Pierre Positionneur prothetique pour l'art dentaire.
DE4127183A1 (de) * 1991-08-16 1993-02-18 Zeiser Manfred P Halteelement zum befestigen von modellteilen beim herstellen von zahnersatz
EP0528335A1 (fr) * 1991-08-16 1993-02-24 Zeiser, Manfred P.Dr. Pivot de fixation dentaire

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