WO2020004372A1 - Barre de formation de surfaces occlusales - Google Patents

Barre de formation de surfaces occlusales Download PDF

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Publication number
WO2020004372A1
WO2020004372A1 PCT/JP2019/025106 JP2019025106W WO2020004372A1 WO 2020004372 A1 WO2020004372 A1 WO 2020004372A1 JP 2019025106 W JP2019025106 W JP 2019025106W WO 2020004372 A1 WO2020004372 A1 WO 2020004372A1
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WO
WIPO (PCT)
Prior art keywords
shank
forming
inclined surface
bar
shape
Prior art date
Application number
PCT/JP2019/025106
Other languages
English (en)
Japanese (ja)
Inventor
勝利 松本
小幡　健二
翔太 松本
亮二 並河
美香 阿久津
Original Assignee
マニー株式会社
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 マニー株式会社 filed Critical マニー株式会社
Publication of WO2020004372A1 publication Critical patent/WO2020004372A1/fr

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/18—Wheels of special form

Definitions

  • the present invention relates to an occlusal surface forming bar used for forming an abutment tooth of a molar.
  • FIG. 4 is a cross-sectional view illustrating an abutment tooth of a molar.
  • the upper surface of the abutment tooth 31 is an occlusal surface 32 that meshes with the opposite tooth.
  • the occlusal surface 32 has a groove called a fovea 32a in the center, and an inclined surface 32b consisting of a plane rising at an angle of about 20 ° to 30 ° on both sides of the fovea 32a.
  • the distance from the center of the fovea 32a to the corner 32c is approximately 3.0 mm.
  • the depth from the upper surface of the crown to the occlusal surface 32 of the abutment tooth 31 is 1.0 mm to 2.5 mm.
  • the angle between the lingual and buccal side surfaces of the abutment tooth 31 is preferably set to about 5 to 10 °. These are sizes determined from the size of general molars.
  • FIG. 5 is an example of a dental bur used for abutment formation.
  • the dental bar 60 has a shank 65 for connecting to a rotating instrument and a working part 61 for grinding teeth.
  • the part shown by the mesh is a part to which abrasive grains adhere.
  • specific shapes of the working unit 61 include, for example, a spherical shape, a cylindrical shape, a conical shape, a barrel shape, and the like. Is used. These dental burs 60 can form the abutment teeth 31 into a desired shape by abutting the affected teeth at various angles and pressing forces in accordance with the grinding position.
  • the fovea is a groove that passes through the center of the occlusal surface of the abutment tooth. In prosthetic treatment, it plays a role in preventing the overlaid crown from shifting.
  • FIG. 6 is a diagram showing the position of the fovea.
  • FIG. 7 is a diagram showing the usage of the fovea-forming bar.
  • the fovea-forming bar 50 is provided on the shank 15 for connection to the rotating device, a working part 51 provided at one end of the shank and having abrasive particles attached to the surface, and a shank side of the working part 51. And a stopper portion 52.
  • the working portion 51 and the stopper portion 52 are in the form of a rotating body having the shank 15 as a rotation axis, and the working portion 51 has a tip protruding portion 51a having a part of a spherical surface on a tip side and a shank side. It has a substantially cylindrical body portion 51b, and its tip projection 51a and body portion 51b are connected by a smooth curved surface.
  • the stopper 52 has a substantially disk shape, and the distance from the rotation axis to the outermost edge is larger than that of the body 51b.
  • a fovea-forming bar 50 By using such a fovea-forming bar 50, it is possible to easily form the shape of the fossa 32a and the portion of the abutment tooth 31 that transitions from the fovea 32a to the inclined surface 32b.
  • the fovea-forming bar 50 has the stopper 52, the stopper 52 is brought into contact with the unground upper surface of the crown, or is ground while visually confirming the position of the stopper 52. By doing so, it is possible to prevent cutting too deep.
  • FIG. 8 is a diagram for explaining a method of grinding the occlusal surface to a uniform depth.
  • a guide groove 35 having a depth of about 1.0 mm from the surface of the affected tooth 30 is formed using the side surface of the conical bar. A method is performed in which several grooves are formed, and then the remaining tooth material between the guide grooves 35 is ground.
  • FIG. 9 is an example of a dental bur that forms a curved surface.
  • the working portion 71 of the dental bar 70 is manufactured to have a shape suitable for forming a curved surface such as a corner portion 32c in particular (Patent Document 1) 1).
  • Patent Document 1 a shape suitable for forming a curved surface such as a corner portion 32c in particular
  • an object of the present invention is to provide an occlusal surface forming bar that can easily form an occlusal surface in the same shape in forming an abutment tooth.
  • the present invention relates to an occlusal surface forming bar used in abutment tooth formation, comprising a shank for connecting to a rotating instrument, and a working portion provided at one end of the shank.
  • a rotating body shape having a shank as a rotation axis, and is composed of a head, an inclined surface forming portion, and a corner portion forming portion in order from the tip side, and the head is rotated at an intermediate position of the side surface. It has a substantially disk shape that is farthest from the axis, and the inclined surface forming part has a tapered shape in which the diameter decreases at a constant rate from the head toward the corner part forming part.
  • the portion has a curved surface shape that is smoothly connected to the inclined surface forming portion and has a diameter that increases toward the shank.
  • the shank side, the inclined surface forming portion, and the corner portion forming portion extend from the middle position of the side surface of the head. It is assumed that abrasive grains are adhered to the respective surfaces.
  • the angle of the tapered shape of the inclined surface forming portion is 10 ° or more and 12 ° or less with respect to the rotation axis, or the corner portion forming portion has a curvature from the inclined surface forming portion toward the shank.
  • the radius may be 1.0 mm or more and 2.0 mm or less, or the distance from the middle position of the side of the head to the boundary between the inclined surface forming portion and the corner portion forming portion may be 2.5 mm or more and 3.5 mm. It is preferred that:
  • the inclined surface having a predetermined width and the corner portion having a predetermined curved shape are always the same using the fovea. This has the effect of being able to be formed as described above.
  • FIG. 1 shows an occlusal surface forming bar according to the present invention.
  • the portion where the abrasive grains 20 are attached is represented by a mesh.
  • FIG. 2 is a diagram illustrating the shape of the working portion of the occlusal surface forming bar.
  • the occlusal surface forming bar 10 is composed of a shank 15 for connecting to a rotating device, and a working portion 11 provided at one end of the shank 15.
  • the working unit 11 has a rotating body shape with the shank 15 as a rotation axis.
  • the working unit 11 is composed of a head 11a, an inclined surface forming unit 11b, and a corner forming unit 11c in this order from the front end side.
  • the head 11a has a substantially disk shape in which an intermediate position of the side surface is farthest from the rotation axis. That is, the side surface of the head 11a is a curved line such as an arc bulging at the middle position.
  • the inclined surface forming portion 11b has a tapered shape in which the diameter decreases at a constant rate from the head portion 11a toward the corner portion forming portion 11c.
  • the corner portion forming portion 11c is smoothly connected to the inclined surface forming portion 11b, and has a curved surface shape whose diameter increases toward the shank 15.
  • the abrasive grains 20 are attached to the surfaces of the shank side, the inclined surface forming portion 11b, and the corner portion forming portion 11c from the intermediate position of the side surface of the head portion 11a. That is, in the working unit 11, the abrasive grains are not attached from the intermediate position of the side surface of the head 11a to the distal end side.
  • the head 11a is a portion that is hooked on the fovea 32a when the occlusal surface 32 is ground using the occlusal surface forming bar 10.
  • the fovea 32a is used as a guide, and the occlusal surface forming bar 10 is moved along the formation direction of the fovea 32a.
  • the inclined surface forming portion 11b is a plane in which the inclined surface 32b to be ground rises at an angle of about 20 ° to 30 ° on both sides across the fovea 32a, and thus has a linear taper shape according to the angle. . Since the corner 32c is a portion that smoothly connects the inclined surface 32b to the side surface of the abutment tooth 31, the corner forming part 11c has a smooth curved surface.
  • the head 11a has a height H in the axial direction of about 0.4 to 0.9 mm and an outer diameter of 2.5 to 3.5 mm at a middle position on the side surface. Since the head 11a is a portion that hooks on the fovea 32a during grinding, the size of the head 11a is determined from the width and depth of the fovea.
  • the tapered shape of the inclined surface forming portion 11b is set such that the angle ⁇ of the surface of the inclined surface forming portion 11b with respect to the rotation axis is 10 ° or more and 12 ° or less, preferably 11 °. This is calculated as an angle at which the occlusal surface forming bar 10 is easily brought into contact when forming the inclined surface 32b that rises 20 ° to 30 ° from the fovea 32a.
  • the corner portion forming portion 11c has a curved surface shape having a curvature radius R from the inclined surface forming portion 11b toward the shank 15 of 1.0 mm or more and 2.0 mm or less, and preferably has a curvature radius R of 1.5 mm. Good. This is a size determined from the shape of the corner 32c.
  • the distance L from the middle position of the side surface of the head 11a to the boundary between the inclined surface forming portion 11b and the corner portion forming portion 11c is set to be 2.5 mm or more and 3.5 mm or less, and preferably 3.0 mm. This is because the distance from the center of the fovea 32a to the corner 32c is 3.0 mm as shown in FIG.
  • FIG. 3 is a view showing the use of the occlusal surface forming bar.
  • the occlusal surface forming bar 10 of the present invention is used in a state where a fovea 32a is formed substantially at the center of the occlusal surface 32 of the abutment tooth 31.
  • the method of forming the fovea 32a may be the same as the conventional method. However, if the fovea formation bar 50 shown in FIG. 7 is used, the fovea can be accurately and easily formed. When used in combination with the surface forming bar 10, the abutment tooth can be more easily formed.
  • the working unit 11 can simultaneously grind the inclined surface 32b and the corner 32c of the occlusal surface 32. That is, since the inclined surface forming portion 11b has a linear taper shape and the corner portion forming portion 11c is formed of a desired curved surface, if the head 11a is hooked on the fovea 32a and ground, it is naturally formed. The configuration is such that an inclined surface 32b and a corner portion 32c are formed. At this time, if the working unit 11 can be freely moved, grinding may be performed carelessly. In order to avoid such a situation, the occlusal surface forming bar 10 is moved by using the fovea 32a as a guide. 32a. Unnecessary grinding of the central fossa 32a is prevented by not attaching abrasive grains from the intermediate position between the distal end surface and the side surface of the head 11a to the distal end side.
  • the occlusal surface forming bar of the present invention it is possible to easily form an occlusal surface having a predetermined shape using the fovea.

Abstract

L'invention concerne une barre de formation de surfaces occlusales avec laquelle des surfaces occlusales peuvent être facilement formées avec des formes identiques pendant la formation d'une dent d'ancrage. La barre (10) selon l'invention, qui est destinée à former des surfaces occlusales et utilisée dans la formation d'une dent d'ancrage, comporte : une tige (15), permettant une liaison à un mécanisme rotatif ; et une unité de travail (11), disposée sur une extrémité de la tige (15). L'unité de travail (11) a la forme d'un corps rotatif tournant autour de la tige (15) et comprend, dans l'ordre depuis le côté extrémité de pointe, une section de tête (11a), une section de formation de surface inclinée (11b) et une section de formation de coin (11c). La section de tête (11a) a sensiblement une forme de disque dans laquelle la position centrale d'une surface latérale est la plus éloignée de l'axe de rotation. La section de formation de surface inclinée (11b) a une forme effilée ayant un diamètre qui diminue progressivement selon un taux constant de la section de tête (11a) vers la section de formation de coin (11c). La section de formation de coin (11c) présente une forme de surface incurvée, qui est reliée avec régularité à la section de formation de surface inclinée (11b) et a un diamètre qui augmente vers la tige (15). Des grains abrasifs sont fixés aux surfaces de chacune de la section de formation de surface inclinée (11b) et de la section de formation de coin (11c), ainsi qu'à la surface de la section de tête (11a), de la position centrale de surface latérale jusqu'au côté tige.
PCT/JP2019/025106 2018-06-25 2019-06-25 Barre de formation de surfaces occlusales WO2020004372A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-120213 2018-06-25
JP2018120213A JP7210167B2 (ja) 2018-06-25 2018-06-25 咬合面形成用バー

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WO2020004372A1 true WO2020004372A1 (fr) 2020-01-02

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5631744A (en) * 1979-08-20 1981-03-31 Neuwirth Siegmund Alexander Tooth grinder
JPS5734843A (en) * 1980-04-25 1982-02-25 Rigoo Mishiyuru Standardizing work for tooth in fitting of crown and tool for preparation
JPS58185147A (ja) * 1982-04-23 1983-10-28 松風陶歯製造株式会社 歯科用研磨材
FR2639216A1 (fr) * 1988-11-23 1990-05-25 Truche Francis Fraise rotative pour applications dentaires
JP2012085884A (ja) * 2010-10-20 2012-05-10 Shofu Inc 曲面付与用歯科用研削バー

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62174518U (fr) * 1986-04-25 1987-11-06
JPH0410810Y2 (fr) * 1986-07-25 1992-03-17
DE3702097A1 (de) * 1987-01-24 1988-08-04 Aribo Staude Bohrer zur praeparation von zaehnen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5631744A (en) * 1979-08-20 1981-03-31 Neuwirth Siegmund Alexander Tooth grinder
JPS5734843A (en) * 1980-04-25 1982-02-25 Rigoo Mishiyuru Standardizing work for tooth in fitting of crown and tool for preparation
JPS58185147A (ja) * 1982-04-23 1983-10-28 松風陶歯製造株式会社 歯科用研磨材
FR2639216A1 (fr) * 1988-11-23 1990-05-25 Truche Francis Fraise rotative pour applications dentaires
JP2012085884A (ja) * 2010-10-20 2012-05-10 Shofu Inc 曲面付与用歯科用研削バー

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JP2020000311A (ja) 2020-01-09
JP7210167B2 (ja) 2023-01-23

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