WO1997011652A1 - Fraise de dentiste - Google Patents

Fraise de dentiste Download PDF

Info

Publication number
WO1997011652A1
WO1997011652A1 PCT/SE1996/001189 SE9601189W WO9711652A1 WO 1997011652 A1 WO1997011652 A1 WO 1997011652A1 SE 9601189 W SE9601189 W SE 9601189W WO 9711652 A1 WO9711652 A1 WO 9711652A1
Authority
WO
WIPO (PCT)
Prior art keywords
burr
head
angle
limited area
conical
Prior art date
Application number
PCT/SE1996/001189
Other languages
English (en)
Inventor
Leif Hagne
Original Assignee
Nordiska Dental Ab
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 Nordiska Dental Ab filed Critical Nordiska Dental Ab
Priority to EP96932125A priority Critical patent/EP0794739A1/fr
Publication of WO1997011652A1 publication Critical patent/WO1997011652A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C3/00—Dental tools or instruments
    • A61C3/02—Tooth drilling or cutting instruments; Instruments acting like a sandblast machine

Definitions

  • the present invention relates generally to a burr and more specifically to a burr having a shaft and a conical head.
  • SE-C-9202428 discloses, among other things, a direct dental restoration, in which a cavity is first formed in a tooth.
  • the mouth of the cavity is prepared by means of a conical burr to give it a corresponding conical shape.
  • a conical insert having the same cone angle as the coni ⁇ cal burr is applied and finally fixed in the cavity.
  • This technique is advantageous by the mouth of the cavity being filled completely by the conical insert, which suitably consists of ceramic material. The risk of shrinkage and gap formation is thus eliminated almost completely.
  • the prior-art technique may, however, be difficult to apply in the cases where the cavity is located in the proximal area of a tooth, i.e. the part of the tooth that is located closest to a neighbouring tooth in the same jaw. Then the design of the cavity and especially the mouth thereof may in fact result in also the neighbouring tooth being affected by grinding, which, of course, is not desirable.
  • the object of the present invention is to eliminate the above-mentioned drawback to the greatest possible extent.
  • the burr of the type mentioned by way of introduction being given the features that appear from claim 1.
  • Advan ⁇ tageous embodiments of the burr are defined in the sub- claims.
  • the circumferential surface of the head of the burr is given a material-removing design within a circumferentially limited area.
  • the limit to how close a cavity can be formed in a tooth without a neighbouring tooth being affected can then be defined by means of the conical surface, of which the mouth of the cavity constitutes a part. More speci ⁇ fically, a cavity can be formed such that said conical surface merely touches upon a point on the neighbouring tooth.
  • the size of the oscillating motion of the burr and the size of said circumferentially limited area should thus be such that the material-removing part of the cir ⁇ cumferential surface of the burr does not run the risk of reaching the point of contact between the conical sur ⁇ face of the intended cavity and the neighbouring tooth.
  • the sum of the rotary angle of the oscillating motion in either direction and the angular size of the limited area relative to the centre axis of the head of the burr should be less than one revolution (360°).
  • Fig. 1 is a schematic side view of two teeth
  • Fig. 2 is a view along line II-II of part of the teeth in Fig. 1
  • Fig. 3 is a side view of an embodiment of a burr according to the invention
  • Fig. 4 is an end view of the burr in Fig. 3
  • Fig. 5 is an end view, corresponding to Fig. 4, of another embodiment of the inventive burr.
  • Figs 1 and 2 show two teeth 1 and 2, which are jux ⁇ taposed in one and the same jaw.
  • a cavity 3 is schematically shown, the mouth 4 of which is coni- cal.
  • the actual mouth surface is more precisely part of a conical surface 5, which is indicated by dashed lines in Fig. 1. As illustrated in Fig. 1, this conical surface 5 is positioned such that it touches the surface of the tooth 1 in a point 6.
  • the embodiment of an inventive burr as shown in Fig. 3 consists of a shaft 7 and a head 8.
  • the shaft 7 is rotationally symmetrical and formed with an inner cylindrical part and an outer spherical part.
  • the shaft can be mounted in an optional angu ⁇ lar position in a chuck, which is adapted to carry out an oscillating motion having in any case smaller rotary angles in each direction than 360°.
  • the head 8 of the burr has the form of a truncated cone. For removing material, it preferably has a coat ⁇ ing of diamond powder, but some other material-removing design is of course also possible.
  • the specific feature of the head 8 of the burr according to the invention is that on the circumferential surface thereof, the mate ⁇ rial-removing design is to be found merely within a cir ⁇ cumferentially limited area 9.
  • the limited area 9 occupies an angle of about 180° relative to the centre axis of the head 8 of the burr.
  • the limited area 9' occupies an angle of about 90°.
  • a general condition to make it possible to give a cavity in a tooth a conical mouth without grinding down a neighbouring tooth in or around such a point as the point 6 in Figs 1 and 2 is that the sum of the angular size of the limited area 9 relative to the centre axis of the head 8 of the burr and the angular size of the oscillat ⁇ ing motion of the burr in either direction about the same centre axis is less than 360°.
  • the chuck in which the burr is adapted to be fixed, is designed to oscillate half a revolution back and forth, the limited area of the burr must thus occupy a smaller angle than about 180°. If instead it occupies an angle of about 90°, an area having an angle of about 90° relative to the centre axis of the burr will not be worked by the burr while using the same chuck motion.
  • the burr which preferably has a truncated conical head 8 to remove material also in the bottom of a cavity, also the surface of the free end 10, 10' of the head 8 of the burr has a material- removing design of the same kind as the limited area on the circumferential surface of the head 8 of the burr.
  • a conical insert preferably made of ceramic material
  • the requisite material is removed, in which operation other kinds of burrs can be used, whereupon the mouth of the cavity is formed by means of an inventive burr.
  • a suitably truncated conical insert is applied and fixed in a per se known manner.

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)
  • Brushes (AREA)

Abstract

Cette invention se rapporte à une fraise de dentiste comportant un arbre (7) et une tête conique (8). La surface circonférentielle de la tête de la fraise est d'une conception facilitant l'extraction de matière uniquement à l'intérieur d'une zone limitée (9) de ladite surface circonférentielle. L'angle qui est occupé par cette zone limitée de la surface circonférentielle par rapport à l'axe centrale de la tête de fraise et l'angle de rotation à l'intérieur duquel la fraise est conçue pour osciller, ont une somme qui est inférieure à 360°.
PCT/SE1996/001189 1995-09-25 1996-09-24 Fraise de dentiste WO1997011652A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96932125A EP0794739A1 (fr) 1995-09-25 1996-09-24 Fraise de dentiste

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9503299-1 1995-09-25
SE9503299A SE503868C2 (sv) 1995-09-25 1995-09-25 Tandborr

Publications (1)

Publication Number Publication Date
WO1997011652A1 true WO1997011652A1 (fr) 1997-04-03

Family

ID=20399573

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/001189 WO1997011652A1 (fr) 1995-09-25 1996-09-24 Fraise de dentiste

Country Status (3)

Country Link
EP (1) EP0794739A1 (fr)
SE (1) SE503868C2 (fr)
WO (1) WO1997011652A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5970631A (en) * 1996-07-23 1999-10-26 Artemis Innovations Inc. Footwear for grinding
US6006450A (en) * 1998-08-12 1999-12-28 Artemis Innovations Inc. Wear resistant grind shoe apparatus
US6041525A (en) * 1996-07-23 2000-03-28 Artemis Innovations Inc. Footwear grinding apparatus with flanking bearing surfaces
US6115946A (en) * 1996-07-23 2000-09-12 Artemis Innovations Inc. Method for making footwear grinding apparatus
US6240592B1 (en) 1999-11-19 2001-06-05 Bernard A. Li Wheel detailing apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4830615A (en) * 1987-07-02 1989-05-16 Goldstein Ronald E Two-grit cutting and polishing instruments
WO1993013726A1 (fr) * 1992-01-07 1993-07-22 Nordiska Dental Ab Inlay, porte-inlay, procede d'obturation dentaire et trousse d'obturation dentaire pour la realisation de ce procede

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4830615A (en) * 1987-07-02 1989-05-16 Goldstein Ronald E Two-grit cutting and polishing instruments
WO1993013726A1 (fr) * 1992-01-07 1993-07-22 Nordiska Dental Ab Inlay, porte-inlay, procede d'obturation dentaire et trousse d'obturation dentaire pour la realisation de ce procede

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5970631A (en) * 1996-07-23 1999-10-26 Artemis Innovations Inc. Footwear for grinding
US6006451A (en) * 1996-07-23 1999-12-28 Artemis Innovations Inc. Footwear apparatus with grinding plate and method of making same
US6041525A (en) * 1996-07-23 2000-03-28 Artemis Innovations Inc. Footwear grinding apparatus with flanking bearing surfaces
US6115946A (en) * 1996-07-23 2000-09-12 Artemis Innovations Inc. Method for making footwear grinding apparatus
US6158150A (en) * 1996-07-23 2000-12-12 Artemis Innovations Inc. Longitudinal grind plate
US6006450A (en) * 1998-08-12 1999-12-28 Artemis Innovations Inc. Wear resistant grind shoe apparatus
US6240592B1 (en) 1999-11-19 2001-06-05 Bernard A. Li Wheel detailing apparatus

Also Published As

Publication number Publication date
SE9503299L (sv) 1996-09-23
SE9503299D0 (sv) 1995-09-25
SE503868C2 (sv) 1996-09-23
EP0794739A1 (fr) 1997-09-17

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