WO1982000757A1 - Outil de mecanicien dentiste et dispositif de retenue de l'outil - Google Patents

Outil de mecanicien dentiste et dispositif de retenue de l'outil Download PDF

Info

Publication number
WO1982000757A1
WO1982000757A1 PCT/US1980/001153 US8001153W WO8200757A1 WO 1982000757 A1 WO1982000757 A1 WO 1982000757A1 US 8001153 W US8001153 W US 8001153W WO 8200757 A1 WO8200757 A1 WO 8200757A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool
base support
dental technician
retainer
model base
Prior art date
Application number
PCT/US1980/001153
Other languages
English (en)
Inventor
M Deravanessian
Original Assignee
M Deravanessian
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 M Deravanessian filed Critical M Deravanessian
Priority to PCT/US1980/001153 priority Critical patent/WO1982000757A1/fr
Priority to EP19810901005 priority patent/EP0058664A1/fr
Publication of WO1982000757A1 publication Critical patent/WO1982000757A1/fr

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

  • This invention has to do with improvements in the tools available to dental technicians as they go about their daily work of creating artificial teeth, crowns and bridges for use in dental restorations. More particularly, the invention has to do with improvements in the pin or dowel tools available to the dental technician to hold tooth dies in precise position for crafting restorative appliances.
  • the invention further relates to retainer devices for such pin or dowel tools, and to novel methods of forming casting cavities by the "lost wax" method using the tool and tool retainers of the invention.
  • the dentist prepares the tooth by removing diseased portions, and any other portions needed to mount a replacement surface on the treated tooth.
  • the nerves are removed from the tooth portions deep below the gum line.
  • a gold or like material cover is used and is fitted onto the tooth with great precision for reasons of comfort, appearance and disease control.
  • the dentist cuts a "margin" to which the crown is seated exactly.
  • the dental technician receives from the dentist a negative or "impression" of the tooth surface to be restored, and of the adjoining teeth as well.
  • a positive of the tooth area is prepared using the negative impression as a mold to make a "model".
  • teeth for which crowns are to be made for example are cut from the model by carefully sawing the model between the teeth.
  • the single tooth die resulting is extensively handled in connection with formation and fitting of the crown , br idge or o ther appl iance . It is evident th at careful contour ing of the new crown to the tooth portion underneath it, the tooth surfaces on either side of it, and to the tooth sur f aces above and laterally above it is required , a painstaking hand process requiring numerous cut and try efforts. In this process , it is necessary to remove and replace the tooth die relative to the model often.
  • the model is carried on a base support molded thereto , and the die itself is dr ill ed out ( dry process ) or molded around (wet process) the head portion of a a dowel which eases handling of the die and wh ich in cooperation with a hole below the die in the support base permits rereplacement of the die in position relative to the other parts of the model .
  • multiple tooth dies adjacent one another are used in restoration work.
  • tooth dies tend to rotate about and become cocked from their true axis owing to the width of the kerfs between adjacent dies in the model , and to the wear occuring in the base support f r om f r equent insertion and removal .
  • the available dowels have been metal pins of circular cross-section which of course act as axles for the die relative to the base support.
  • the ar t has employed cooper ating tongue and g r oov e arrangements in which grooves are cut in the die bottom and tongues are molded on the opposing surface of the base support , so that rotation of the dies is minimized , but the success of this technique is unduly dependent on properly seating the relatively wide angle tongue and groove , and extra processing steps to cut grooves for each tooth die are required as well.
  • Others have proposed use of two dowel pins on a common base, which blocks rotation but is deficient in cocking resistance in other than the transverse direction. Also the great size of such pin arrangements prohibits their use where very small teeth are involved .
  • a dental technician's tool adapted for the rapid and accurate positioning of a tooth model die repetitively on a model base support
  • the tool comprising an axially elongated member having an upwardly extended head portion engageable with said tooth model die, a downwardly tapered bottom portion receivable in the base support, and a downwardly diminishing intermediate portion of cusped transverse cross-section arranged to engage the base support above the member bottom against cocking or rotation of the tooth die in mounted position on the model base support, but in repetitively vertically separable relation.
  • the member head portion is generally cylindrical about the member axis and rises from a transverse shoulder formed on the member; the bottom portion is coaxial with the head portion and tapered at a first angle relative to the member axis; the intermediate portion is frusto-conically tapered downwardly from the transverse shoulder at a second larger angle relative to the member axis and vertically defines a plurality of circumf erentially spaced surface rounded splines disposed at a third still larger angle relative to the member axis for spline differential taper regression vertically into the intermediate portion in inwardly tapered cusp-forming relation along the length of the intermediate portion.
  • the member head portion is partially threaded for wet or dry process tooth model die engagement.
  • the intermediate portion splines are equidistantly spaced and the member shoulder defines a circular series of lobes coincident with the upper terminus of the splines, the head portion being of reduced diameter relative to the intermediate portion, and the member is comprised of highly rigid, molded, filler
  • the member is a male member, a complementary female member defining a socket adapted to receive the tool in retaining relation on a model base support
  • a dental technician's tool retainer adapted for the repetitive, rapid and accurate positioning of a tooth model die having an axially elongated member, such as th aforedescribed tool member, projecting fixedly therefrom on a model base support
  • the tool retainer comprising an apertured body having an internal wall defining a bore adapted to cooperatively seat the elongated member against cocking and rotation, the body being adapted to insertion in a model base support, and anchor means on the body periphery adapted to block relative movement of the body and the model base support in projecting member seated relation.
  • the apertured body is a toroidal member, and further includes a series of bosses raised on the toroidal member surface in anchor means defining relation.
  • the boss series comprise relatively vertically spaced circular series of bosses in angularly indexed relation between series.
  • the tool retainer also includes a depending annular skirt extension of the toroidal member wall adapted to insertion in the model base support vertically beyond the toroidal member against cocking of the toroidal member relative to the surrounding model base support, the skirt extension further having a noncircular cross section against rotation about the toroidal member axis of revolution relative to the surrounding model base support, e.g. circumferentially spaced vertical ribs imparting external noncircularity to the skirt extension.
  • the technician's tool retainer may be comprised of molded, highly rigid, filler reinforced plastic.
  • the invention provides a dental technician's tool and retainer combination adapted for the rapid and accurate positioning of a tooth model die repetitively on a model base support, the tool comprising an axially elongated member having an upwardly extended head portion engageable with the tooth model die, a downwardly tapered bottom portion and a downwardly diminishing intermediate portion of cusped transverse cross-section, the tool retainer comprising an apertured body having an internal wall defining a tapered bore of cusped transverse cross section adapted to cooperatively seat the elongated member against cocking and rotation, the body being adapted to repetitive insertion in and removal from the model base support, and anchor means on the body periphery adapted to block relative movement of the body and the model base support in -projecting member seated relation against cocking or rotation of the tooth die in mounted position on the model base support.
  • the dental technician's tool and tool retainer combination may define a color matchable set in tooth model die base support accurate repositioning facilitating relation.
  • the apertured body being a toroidal member
  • the member head portion being generally cylindrical about the member axis and rising from a transverse shoulder formed on the member; the bottom portion being coaxial with the head portion and tapered at an angle relative to the member axis;
  • the intermediate portion is frusto-conically tapered downwardly from the transverse shoulder at a like angle relative to the member axis and vertically defining a plurality of circumferentially spaced surface rounded splines disposed at a relatively large angle relative to the member axis for spline differential taper regression vertically into the intermediate portion in inwardly tapered cusp-forming relation along the length of the intermediate portion; a series of bosses raised on the toroidal member surface in anchor means defining relation, the member head portion being partially threaded for wet or dry process tooth model die engagement, the boss series comprising relatively vertically spaced circular series of bosses in angularly indexed relation between series, the tool intermediate portion
  • the invention contemplates in the method of fabricating restorative crowns having a crown post by forming a suitably shaped cavity at low temperatures around a heat meltable form, melting the form to empty the cavity, and casting the crown forming material thereinto, the cavity including a post defining elongated zone, the improvement comprising using the dental technician's tool hereindefined as the meltable form about which post defining elongated zone is formed; and further as aspects of method, in the method of fabricating tooth restorations by forming a suitably shaped cavity at the terminus of an inlet passage defined by a heat meltable form, the passage having an intermediate enlargement adapted to provide a reservoir of casting material beyond the cavity, the improvement comprising using the dental technician's tool retainer hereindefined as the heat meltable form about which the reservoir enlargement and an adjacent portion of the inlet passage is formed.
  • Fig. 1 is a front elevation view of a tooth model on a base support, one tooth die being shown removed;
  • Fig. 2 is a front elevation view of the dental technician's tool according to the invention.
  • Fig. 3 is a like view of the tool retainer thereof
  • Fig. 4 is a vertical section of the tool and retainer assembled
  • Fig. 5 is a transverse sectional view of the assembled tool and retainer, taken on line 5-5 in Fig. 4.
  • a base support 10 of a rigid "stone" composition has been adhesively attached to the tooth model 12 by pressing the tooth model against the support material while the latter is formable, and thereafter the base support has been trimmed to a convenient size and shape as shown.
  • the tooth model 12 is a positive replication of a number of teeth in the form of dies 14 which are individually labeled a through h. Tooth dies are used to shape crowns, bridges and like appliances. Each tooth die is cut from the model by sawing between the adjacent teeth, note kerfs 16, 18, 20 and 22, indicating that tooth dies c, d, and e have been freed from the model.
  • Die d is shown raised up to illustrate the use of the tool and tool retainer dowel pin assembly of the invention. Inspection of Fig. 1 shows that tool 24 extends upward into die d with head portion 26, and downward toward base support 10 with tool intermediate portion 28 and bottom portion 30, to be received by the tool retainer 32 embedded in the base support.
  • the unusual shape of the tool 24, and complementary unusual shape of the retainer 32 will become apparent.
  • the tool 24 it is shown to comprise an axially elongated member 34 having an upwardly extended, generally cylindrical head portion 26, partially threaded at 36 to accommodate wet process or in situ formation of the model around the head, and partially smooth walled, at 38, for dry process drilling and insertion of the head in the model 12.
  • the head portion 26 rises from member transverse shoulder 40 and is substantially reduced in diameter from the shoulder as shown to adequately seat the tooth die and to accommodate various tooth sizes.
  • the tool member 34 below the shoulder 40 has an intermediate portion 28 of downwardly diminishing dimension, and more particularly of a f rusto-conical shape to taper downwardly along its length. See Fig. 4 particularly.
  • the member 34 further has a bottom portion 30 which is also downwardly tapered. It is to be noted that the taper of the bottom portion 30 relative to the longitudinal axis A-A of the tool 24 and retainer- 32 is at a first angle of approximately 3 ; the intermediate portion 28 is also at an angle to the the axis A-A of approximately 3 .
  • this portion defines four circumferentially spaced splines 44 which are equidistantly spaced and terminate upwardly at the shoulder 40.
  • the splines 44 are at an angle relative to the axis A-A of approximately 36 .
  • the splines further are rounded at the outermost surfaces 46, giving rise, where the spline surfaces meet the wall 48 of the intermediate portion to cusps 50, the spline cross-section itself also defining a cusp where the radius of curvature is sufficiently small, e.g. at 52.
  • the retainer 32 is an apertured body, preferably exteriorly rounded to form a toroidal member 54, having an internal wall 58, stepped at 60 which defines a bore 56 adapted to cooperatively seat the elongated member 34 against cocking and rotation.
  • Elongated member 34 defines an annular shoulder 62 at the base of member intermediate portion 28, which shoulder delimits the frusto-conical intermediate portion 28 downwardly and which together with surface 64 of the intermediate portion provides a complementary surface to bore defining wall 58 adapted to congruently interfit with the bore in wedged relation against cocking of the member 34 relative to the retainer toroidal body member 54.
  • the retainer toroidal member 54 is provided with annular skirt extension 42 to further interfit with and enclose the member 34 against cocking.
  • the skirt extension 42 itself is provided with external radially directed ribs 66 circularly spaced about the extension perimeter in a manner to provide overall a noncircular cross-section to the skirt extension thus to block rotation of the skirt extension and integrally formed body member 54 about the member 54 axis of revolution A-A, in embedded condition in the base support 10.
  • anchor means in the form of outwardly, radially projecting tabs or bosses 68 are provided on the upper and lower hemispheres 70 and 72, respectively, of the retainer member 54 in angularly displaced or indexed circumferential series 74 and 76, respectively.
  • the retainer 32 and tool 24 are preferably molded in high modulus plastic such as glass fiber filled nylon (polyamide resin) .
  • high modulus plastic such as glass fiber filled nylon (polyamide resin)
  • Other plastics particularly the engineering plastics such as p ol sul f ones , pol oxy e thy lenes, polyhydroxyethers, pol imides and the like may be used, suitably with reinforcing fillers such as glass and carbon black among others.
  • Crosslinking polyolefins and thermosets may also be used as the materials of fabrication. Injection molding is presently the fabrication method of choice, because the tool and retainer lend themselves to inexpensive mass production in this manner.
  • the form to be cast in gold for example, is executed in wax, a vitreous material is poured around the wax and allowed to harden. Upon heating, the wax melts and runs out, leaving a precisely shaped cavity.
  • wax is used to define the crown, but the tool 24, shaped as necessary to meet canal size and taper requirements, is substituted for the wax in the region of the crown post and the vitreous material formed therearound, the tool strength enabling effective forming of the post shape needed.
  • the tool 24 melts and runs out upon heating leaving a post forming cavity.
  • the tool retainer is similarly useful elsewhere in the dental laboratory, namely in forming the reservoir cavity normally provided, again by the lost wax process just beyond the cavity defining the crown so that an excess amount of casting material will be available and voids prevented in the cast parts.
  • the retainer 32 is used in replacement of the wax or other expedient in the region between the cast crown or the like and the reservoir area so that the toroidal member 54 shapes a reservoir cavity upon surrounding the wax form and retainer assembly with vitreous material.

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

Combinaison d'outil de mecanicien dentiste et de dispositif de retenue adapte au positionnement rapide et precis d'un moule de modele dentaire de maniere repetitive sur un support de base de modele, l'outil (24) comprenant un organe (34) allonge axialement possedant une portion (26) de tete etendue vers le haut pouvant s'engager avec le moule de modele dentaire, une portion (30) de fond conique vers le bas et une portion (28) intermediaire se reduisant vers le bas presentant une section transversale a corne, le dispositif de retenue de l'outil comprenant un corps pourvu d'ouvertures possedant une pu paroi interne (58) definissant un alesage conique presentant une section transversale assurant de concert l'assise de l'organe allonge afin d'en empecher la rotation et le mouvement de cote, le corps (54) etant adapte a l'insertion et a l'extraction repetitives dans le support de base de modele (10), et des moyens d'ancrage (68) sur la peripherie du corps concus pour bloquer le mouvement relatif du corps et du support de base de modele dans une relation d'assise d'organe en saillie afin d'empecher le mouvement de cote ou la rotation du moule dentaire dans la position montee sur le support de base de modele.
PCT/US1980/001153 1980-08-29 1980-08-29 Outil de mecanicien dentiste et dispositif de retenue de l'outil WO1982000757A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/US1980/001153 WO1982000757A1 (fr) 1980-08-29 1980-08-29 Outil de mecanicien dentiste et dispositif de retenue de l'outil
EP19810901005 EP0058664A1 (fr) 1980-08-29 1980-08-29 Outil de macanicien dentiste et dispositif de rentenue de l'outil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/US1980/001153 WO1982000757A1 (fr) 1980-08-29 1980-08-29 Outil de mecanicien dentiste et dispositif de retenue de l'outil
WOUS80/01153800829 1980-08-29

Publications (1)

Publication Number Publication Date
WO1982000757A1 true WO1982000757A1 (fr) 1982-03-18

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PCT/US1980/001153 WO1982000757A1 (fr) 1980-08-29 1980-08-29 Outil de mecanicien dentiste et dispositif de retenue de l'outil

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EP (1) EP0058664A1 (fr)
WO (1) WO1982000757A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0875212A1 (fr) * 1995-09-19 1998-11-04 Shopvest Inc Modéle de travail pour la préparation d'une couronne sur un implant
US5934906A (en) * 1975-09-19 1999-08-10 Shopvest, Inc. Working model for prosthodontic preparation of a tooth for installation of an implant fixture
EP2967768A1 (fr) * 2013-03-12 2016-01-20 Bruno Spindler Analogue d'implant et corps de support d'analogue

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1037489A (en) * 1910-09-01 1912-09-03 Mark Kelsey Process of producing patterns for castings, &c.
US3153283A (en) * 1962-01-12 1964-10-20 Weissman Bernard Dowel pin assembly for dental dies
US3277576A (en) * 1963-06-06 1966-10-11 Donald E Kraft Restorative dental device
US3470614A (en) * 1966-10-17 1969-10-07 Maurice W Kelly Method and apparatus for making dental die
US3518761A (en) * 1967-09-28 1970-07-07 Harry Susman Pin and sleeve combination to support dies in dentistry
US3969820A (en) * 1975-02-21 1976-07-20 The J. M. Ney Company Composite dowel pin for dental models
US4056585A (en) * 1976-05-20 1977-11-01 Waltke Robert W Tooth die and method and apparatus for making the same
US4205443A (en) * 1978-05-08 1980-06-03 Ipco Hospital Supply Corporation Two-part dowel pin and tool therefor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1037489A (en) * 1910-09-01 1912-09-03 Mark Kelsey Process of producing patterns for castings, &c.
US3153283A (en) * 1962-01-12 1964-10-20 Weissman Bernard Dowel pin assembly for dental dies
US3277576A (en) * 1963-06-06 1966-10-11 Donald E Kraft Restorative dental device
US3470614A (en) * 1966-10-17 1969-10-07 Maurice W Kelly Method and apparatus for making dental die
US3518761A (en) * 1967-09-28 1970-07-07 Harry Susman Pin and sleeve combination to support dies in dentistry
US3969820A (en) * 1975-02-21 1976-07-20 The J. M. Ney Company Composite dowel pin for dental models
US4056585A (en) * 1976-05-20 1977-11-01 Waltke Robert W Tooth die and method and apparatus for making the same
US4205443A (en) * 1978-05-08 1980-06-03 Ipco Hospital Supply Corporation Two-part dowel pin and tool therefor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5934906A (en) * 1975-09-19 1999-08-10 Shopvest, Inc. Working model for prosthodontic preparation of a tooth for installation of an implant fixture
EP0875212A1 (fr) * 1995-09-19 1998-11-04 Shopvest Inc Modéle de travail pour la préparation d'une couronne sur un implant
EP2967768A1 (fr) * 2013-03-12 2016-01-20 Bruno Spindler Analogue d'implant et corps de support d'analogue
EP2967768B1 (fr) * 2013-03-12 2021-07-21 Bruno Spindler Analogue d'implant et support d'analogue

Also Published As

Publication number Publication date
EP0058664A1 (fr) 1982-09-01

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