WO2023282173A1 - 歯科用エンドミル、及び加工方法 - Google Patents

歯科用エンドミル、及び加工方法 Download PDF

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Publication number
WO2023282173A1
WO2023282173A1 PCT/JP2022/026229 JP2022026229W WO2023282173A1 WO 2023282173 A1 WO2023282173 A1 WO 2023282173A1 JP 2022026229 W JP2022026229 W JP 2022026229W WO 2023282173 A1 WO2023282173 A1 WO 2023282173A1
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WO
WIPO (PCT)
Prior art keywords
dental
end mill
processing
workpiece
diameter
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/JP2022/026229
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English (en)
French (fr)
Japanese (ja)
Inventor
祥 伊藤
牧子 加藤
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.)
Kuraray Noritake Dental Inc
Original Assignee
Kuraray Noritake Dental Inc
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 Kuraray Noritake Dental Inc filed Critical Kuraray Noritake Dental Inc
Priority to JP2023533583A priority Critical patent/JPWO2023282173A1/ja
Priority to EP22837589.5A priority patent/EP4368146A4/en
Priority to US18/576,503 priority patent/US20250319532A1/en
Publication of WO2023282173A1 publication Critical patent/WO2023282173A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B23C5/1009—Ball nose end mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0004—Computer-assisted sizing or machining of dental prostheses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/12—Tools for fastening artificial teeth; Holders, clamps, or stands for artificial teeth
    • 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
    • A61C3/06—Tooth grinding or polishing discs; Holders therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0006—Production methods
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/08—Artificial teeth; Making same
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/18—Ceramic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2226/00—Materials of tools or workpieces not comprising a metal
    • B23C2226/31—Diamond
    • B23C2226/315—Diamond polycrystalline [PCD]

Definitions

  • the present disclosure relates to a dental end mill and a processing method performed by a dental processing machine equipped with this dental end mill.
  • dental prosthesis In the field of dentistry, it is common to manufacture a dental prosthesis that replaces the lost tooth structure and attach it to the affected area to restore function as a treatment for tooth structure that has been lost due to caries.
  • the types of dental prostheses include crowns, inlays, onlays, etc., which are attached to one tooth, as well as bridges, crowns, etc., which are attached to a plurality of teeth.
  • a method of manufacturing a dental prosthesis using a dental processing machine consists of fixing a disk-shaped or block-shaped work material (workpiece) to the dental processing machine, attaching a tool to a spindle rotating at high speed, and using a dental CAM.
  • the work material is machined by operating the tool based on a machining program created in advance using software or the like.
  • Various materials are used as the work material, and hybrid resin, semi-sintered zirconia, PMMA, PEEK, titanium alloys, cobalt-chromium alloys, nickel-chromium alloys, and the like are particularly used.
  • the tools used in dental processing machines are classified into two types: grinding tools in which fine abrasive grains such as diamond particles are bonded with soft metals, etc., and cutting tools with helical blades and grooves.
  • cutting tools are generally called end mills.
  • Machining methods for dental machines are broadly divided into wet types, which process while water is poured in, and dry types, which process while compressed air is sprayed. Because it is easy to clean, it can only be used as a wet type.
  • end mills are widely used as tools for dental processing machines because they generate less frictional heat than grinding tools and can be used for both wet and dry processes, and are applicable to a wide range of work materials.
  • dental prostheses have complex and diverse shapes with different shapes, sizes, and crown lengths for each patient, site, and case. It is necessary to maintain the proper positional relationship and occlusal state with the opposing teeth, and in addition, it is necessary to reproduce the anatomical form before loss, so stable and high quality processing is required.
  • Techniques for suppressing tool wear of end mills include techniques for coating the surface layer of the base material with fine diamond particles or the like, and techniques for using diamond on the cutting edge (see, for example, Patent Documents 1 to 3). .
  • Patent Document 1 discloses a dental end mill in which the surface layer under the neck is coated with fine diamond particles.
  • the hard coating layer is only the surface layer of the lower neck, and the coating film on the surface layer of the lower neck of the end mill may be worn and peeled off early during processing, and a dental prosthesis with high processing quality can be stably obtained. It was difficult.
  • Patent Literature 2 and Patent Literature 3 disclose end mills whose cutting edges and tips are formed of polycrystalline diamond.
  • these end mills are industrial end mills for processing metal materials, and there is no description of processing dental materials, and they are not suitable for processing complex and diverse dental prostheses.
  • the present disclosure has been made in view of the above circumstances, and enables smooth processing of the surface of a dental prosthesis in processing with a dental end mill. Moreover, it makes it possible to stably obtain a highly accurate dental prosthesis.
  • the inventors focused on the material of the lower neck (blade) of the dental end mill, and as a result of extensive research, the use of polycrystalline diamond in the lower neck (blade) of the end mill resulted in , found that the above problems can be solved, further researched based on this knowledge, and completed the present disclosure.
  • a dental end mill for processing a workpiece, comprising a shank portion held by a dental processing machine, a neck portion having a cutting edge, the shank portion and the a neck connecting the necks, the necks being made of polycrystalline diamond.
  • a processing method is a method of processing a workpiece that is executed by a dental processing machine provided with the dental end mill, and includes a step of processing the workpiece using the dental end mill. ,including.
  • FIG. 1 is a plan view showing a schematic configuration of a dental end mill according to an embodiment of the present disclosure
  • FIG. FIG. 2 is a diagram for explaining a processing method according to an embodiment of the present disclosure, and is a schematic diagram of a processing machine provided with the dental end mill shown in FIG. 1;
  • FIG. 1 is a plan view showing a schematic configuration of a dental end mill 10 according to this embodiment.
  • a dental end mill 10 according to the present embodiment is attached to a dental processing machine (see, for example, the dental processing machine 1 in FIG. 2), and is used for processing a workpiece W to produce a dental prosthesis. It is an end mill for
  • a dental end mill 10 includes a shank portion 11, a neck portion 13 having a cutting edge 12, and a neck portion 14 connecting the shank portion 11 and the neck portion 13, as shown in FIG.
  • the neck portion 13 is made of polycrystalline diamond.
  • the lower neck portion 13 of the dental end mill 10 is made of a single material of polycrystalline diamond.
  • the shank portion 11 is attached to, for example, a dental processing machine 1 (more specifically, a spindle 2a of the dental processing machine 1) as shown in FIG.
  • the polycrystalline diamond forming the neck portion 13 is an aggregate of single crystal diamond grains. Since polycrystalline diamond does not have the cleavability peculiar to single crystal diamond, it has excellent wear resistance and is more suitable for working tools than single crystal diamond.
  • the diamonds used in the present disclosure may be natural diamonds or artificial diamonds as long as they are polycrystalline diamonds.
  • artificial diamond artificial polycrystalline diamond produced by, for example, a vapor phase synthesis method or a high-temperature and high-pressure sintering method is preferably used.
  • the polycrystalline diamond may be, for example, sintered diamond in which diamond grains are bonded with a metal binder or the like, or diamond grains in which diamond grains are directly bonded to each other without a binder.
  • the polycrystalline diamond used for the neck portion 13 has an average particle size of 5 nm or more and 10 ⁇ m or less, preferably 1 ⁇ m or less, more preferably 0.5 ⁇ m or less. If the average particle size of the polycrystalline diamond is much larger than the above upper limit, the surface of the dental prosthesis becomes rough and plaque tends to adhere, which is not preferable. On the other hand, if the average particle size of the polycrystalline diamond is too smaller than the above lower limit, cutting efficiency will decrease, which is not preferable.
  • the average particle size of polycrystalline diamond can be measured by, for example, electron microscopic methods such as SEM and TEM, XRD (X-ray diffraction method), and the like.
  • the diameter of the cutting edge 12 of the neck portion 13 of the dental end mill 10 is preferably smaller than the diameter of the shank portion 11 (shank diameter d, see FIG. 1). That is, the blade diameter D of the cutting edge 12 is preferably 0.1 mm or more and 6.0 mm or less, more preferably 0.3 mm or more and 2.0 mm or less. If the blade diameter of the cutting edge 12 is too large than the above upper limit, fine processing cannot be performed, which is not preferable. Further, if the blade diameter of the cutting edge 12 is too smaller than the above lower limit, the machining efficiency is lowered, which is not preferable.
  • the tip shape of the cutting edge 12 of the neck portion 13, that is, the bottom shape of the end mill 10, can be selected from a flat end shape, a radius end shape, a ball end shape, and the like. , preferably a hemispherical ball-end shape. Thereby, a dental prosthesis with a smooth surface can be obtained.
  • the length L of the neck portion 13 is not particularly limited, it is preferably 1.0 mm or more and 30.0 mm or less, and more preferably 1.0 mm or more and 5.0 mm or less. If the length of the neck portion 13 is longer than the above upper limit, the rigidity is lowered, which is not preferable. If the length of the neck portion 13 is shorter than the above lower limit, the processing range is limited, which is not preferable.
  • the shank portion 11 and the neck portion 14 are made of, for example, a cemented carbide base material.
  • Suitable examples of the cemented carbide substrate include, but are not limited to, cermet, which is a composite material of ceramics and metal, and cemented carbide such as tungsten carbide (WC) cemented carbide.
  • the neck portion 13 and the neck portion 14 of the end mill 10 are joined to each other by, for example, welding or brazing. This configuration improves the durability of the end mill 10 .
  • the material of the workpiece W to be cut by the end mill 10 of the present embodiment is not particularly limited as long as it is a dental material, but preferred examples include dental ceramics and dental resins.
  • dental ceramics as the material of the workpiece W, it is possible to obtain a dental prosthesis with excellent long-term aesthetics because it has high biocompatibility and strength and is less likely to deteriorate over time.
  • a dental resin as a material for the workpiece W, a dental prosthesis having good biocompatibility, strength, aesthetics, and light weight can be obtained at a relatively low cost in a short period of time.
  • the shape of the workpiece W is not particularly limited, and may be any shape such as a block shape or a disc shape.
  • the end mill 10 of this embodiment does not limit the type of dental prosthesis to be processed.
  • the dental prosthesis to be processed may be artificial teeth corresponding to any of central incisors, lateral incisors, canines, and molars, and may be crowns, inlays, onlays, bridges, crowns, and implants. Examples include, but are not limited to, a crown attached to an abutment.
  • FIG. 2 is a schematic diagram of an example of the dental processing machine 1 equipped with the dental end mill 10 according to the present embodiment.
  • the dental processing machine 1 includes a cutting section 2, a holding section 3, a control section 4, and the like.
  • the cutting unit 2 has a spindle (main shaft) 2a that holds the end mill 10, a motor 2b that rotates the spindle 2a, a moving unit that moves the spindle 2a in a predetermined direction, and the like.
  • the holding part 3 has a holding member 3a that holds the workpiece W, a moving part that moves the holding member in a predetermined direction, and the like.
  • the control unit 4 is composed of an NC device or the like including a processor, a memory, operation buttons 4a, a monitor 4b, and the like.
  • the end mill 10 of this embodiment is attached to the spindle 2a of the dental processing machine 1, and the workpiece W is attached to the holding member 3a. Thereafter, by changing the relative positional relationship between the end mill 10 and the workpiece W three-dimensionally and rotating the end mill 10, the machining method of the present embodiment can be executed.
  • the processing method according to this embodiment is a method for processing a workpiece W that is executed by the dental processing machine 1 equipped with the dental end mill 10 according to this embodiment.
  • processing the workpiece W using the This process includes a rough machining process and a finish machining process using the dental end mill 10 .
  • the processing method according to the present embodiment may include a coloring process, a sintering process, and the like.
  • the neck portion 13 of the dental end mill 10 is made of polycrystalline diamond. Therefore, it is possible to obtain a dental prosthesis having a smooth surface when the workpiece W has been completely processed by the dental end mill 10 . In addition, since the dental prosthesis after processing has a smooth surface, it is possible to appropriately suppress adhesion of plaque to the surface of the dental prosthesis after being worn in the oral cavity.
  • the dental end mill 10 of the present embodiment in which the lower neck portion 13 is formed of polycrystalline diamond, does not lower the accuracy even when the processing speed is increased, and it is possible to shorten the processing time. It is possible to obtain a dental prosthesis with high precision and high definition.
  • the dental end mill 10 of this embodiment has excellent durability that can withstand repeated machining.
  • the dental end mill 10 of the present embodiment can suppress wear and peeling of the surface layer.
  • the dental end mill 10 of the present embodiment can save labor for manual polishing work. As a result, the dental end mill 10 and the processing method of the present embodiment can suppress deterioration in the processing quality of the dental prosthesis and stably obtain a highly accurate dental prosthesis.
  • the dental processing machine 1 can be equipped with a larger number of end mills 10, and a small dental processing machine 1 suitable for use in the dental field can be provided.
  • the dental processing machine 1 is capable of fine processing, is excellent in processing efficiency, and can produce dental prostheses having complex and diverse shapes with higher precision and higher definition. It can be processed.
  • the dental prosthesis is made to order for the patient, it is necessary to use the same type of end mill 10 to process various shapes.
  • an industrial end mill in which only the cutting edge is made of diamond as in Patent Document 2
  • machining is possible only with the cutting edge, so the machining location of the workpiece and the shape of the workpiece are limited.
  • the dental end mill 10 of the present embodiment since the entire neck portion 13 is formed of polycrystalline diamond, not only the cutting edge but also the side surface of the cutting edge 12 and the side surface of the entire neck portion 13 are used. processing is also possible.
  • the dental end mill 10 of the present embodiment can more accurately and smoothly process dental prostheses of complex and diverse shapes having different shapes, sizes, and crown lengths for each patient, site, and case. It becomes possible to
  • the polycrystalline diamond has an average particle size of 5 nm or more and 10 ⁇ m or less, so that it is possible to obtain a dental prosthesis with a smooth surface to which plaque is less likely to adhere, and Machining with excellent cutting efficiency is possible.
  • the workpiece W is at least one of dental resin and dental ceramic, a dental prosthesis excellent in biocompatibility, strength and aesthetics can be obtained. be able to.
  • Example 1 The operator mounted a processing tool (dental end mill 10) in which polycrystalline diamond with an average particle size of 20 nm was used in the neck portion 13, on a processing machine (MEGA-SSS manufactured by Rokuryo Sangyo Co., Ltd.) with a resolution of 10 nm or less.
  • a dental zirconia (“Noritake Katana (registered trademark) zirconia” STML, manufactured by Kuraray Noritake Dental Co., Ltd.) [diameter 98.5 mm, thickness 18 mm] as a workpiece W was processed as follows.
  • Cutting was carried out under the conditions for high-definition processing for dental crowns shown in Table 1, and a calcined body having a crown shape of about 15 mm x 15 mm x 15 mm was obtained.
  • the rotation speed shown in Table 1 below indicates the spindle rotation speed of the spindle that holds the end mill.
  • the width indicates the processing width in the XY directions.
  • the Z direction is the axial direction of the main shaft, and the XY directions are directions forming a plane perpendicular to the Z direction.
  • the practitioner fired the processed dental crown-shaped calcined body at 1550° C. for 90 minutes to obtain a final prosthesis.
  • Example 2 In Example 2, the practitioner used a dental hybrid resin block (“Katana (registered trademark) Avencia (registered trademark) N”, manufactured by Kuraray Noritake Dental Co., Ltd.) as the workpiece W. Other than this, the practitioner used the same processing machine as in Example 1, and processed under the same high-definition crown processing conditions as in Example 1 to obtain a final prosthesis.
  • a dental hybrid resin block (“Katana (registered trademark) Avencia (registered trademark) N”, manufactured by Kuraray Noritake Dental Co., Ltd.)
  • Comparative Example 1 In Comparative Example 1, the practitioner changed the dental end mill 10 to a conventional dental end mill in which a fine diamond particle coating was used in the neck portion (no polycrystalline diamond was used in the neck portion). Other than this, the practitioner used the same processing machine as in Example 1 and processed and fired under the same high-definition processing conditions for dental crowns as in Example 1 to obtain a final prosthesis.
  • the average surface roughness of the final prosthesis was 0.3 ⁇ m or less in Examples 1 and 2 in which the dental end mill 10 with the polycrystalline diamond neck portion 13 was used.
  • the average surface roughness of the final prosthesis was 30 ⁇ m or more.
  • the dental end mill of the present disclosure can smoothly process the surface of a dental prosthesis in processing with a dental end mill, and can stably obtain a high-precision dental prosthesis. It can be used for processing prostheses and the like. [Cross reference to related application]

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  • 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)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dental Prosthetics (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
PCT/JP2022/026229 2021-07-08 2022-06-30 歯科用エンドミル、及び加工方法 Ceased WO2023282173A1 (ja)

Priority Applications (3)

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JP2023533583A JPWO2023282173A1 (https=) 2021-07-08 2022-06-30
EP22837589.5A EP4368146A4 (en) 2021-07-08 2022-06-30 DENTAL END MILLS AND PROCESSING METHODS
US18/576,503 US20250319532A1 (en) 2021-07-08 2022-06-30 Dental end mill and processing method

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Application Number Priority Date Filing Date Title
JP2021-113297 2021-07-08
JP2021113297 2021-07-08

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WO2023282173A1 true WO2023282173A1 (ja) 2023-01-12

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004255496A (ja) 2003-02-25 2004-09-16 Ngk Spark Plug Co Ltd エンドミル
JP2017119333A (ja) * 2015-12-28 2017-07-06 日進工具株式会社 エンドミルとその製造方法
JP2019502446A (ja) * 2015-12-17 2019-01-31 デンタルポイント アーゲー セラミックインプラント
JP2019217118A (ja) 2018-06-22 2019-12-26 株式会社松風 歯科用エンドミル
JP2020032485A (ja) 2018-08-29 2020-03-05 ファナック株式会社 鏡面加工方法および鏡面加工工具
WO2020250499A1 (ja) * 2019-06-13 2020-12-17 住友電工ハードメタル株式会社 切削工具
JP2021113297A (ja) 2020-01-21 2021-08-05 積水化学工業株式会社 粘着テープ、及びその製造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2019180873A1 (ja) * 2018-03-22 2021-03-18 住友電工ハードメタル株式会社 エンドミル
GB2573524B (en) * 2018-05-08 2023-01-18 Prima Dental Mfg Limited Dental milling tool
EP3653169B1 (en) * 2018-11-15 2023-08-02 SIRONA Dental Systems GmbH Method for producing ceramic dental prosthesis parts, cad/cam machining station, and blank made of final-strength dental ceramic

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004255496A (ja) 2003-02-25 2004-09-16 Ngk Spark Plug Co Ltd エンドミル
JP2019502446A (ja) * 2015-12-17 2019-01-31 デンタルポイント アーゲー セラミックインプラント
JP2017119333A (ja) * 2015-12-28 2017-07-06 日進工具株式会社 エンドミルとその製造方法
JP2019217118A (ja) 2018-06-22 2019-12-26 株式会社松風 歯科用エンドミル
JP2020032485A (ja) 2018-08-29 2020-03-05 ファナック株式会社 鏡面加工方法および鏡面加工工具
WO2020250499A1 (ja) * 2019-06-13 2020-12-17 住友電工ハードメタル株式会社 切削工具
JP2021113297A (ja) 2020-01-21 2021-08-05 積水化学工業株式会社 粘着テープ、及びその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4368146A4

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EP4368146A4 (en) 2025-06-18
JPWO2023282173A1 (https=) 2023-01-12
EP4368146A1 (en) 2024-05-15
US20250319532A1 (en) 2025-10-16

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