EP2453828A1 - Procédé de fabrication d'une pièce usinée comportant un contour intérieur et un contour extérieur - Google Patents

Procédé de fabrication d'une pièce usinée comportant un contour intérieur et un contour extérieur

Info

Publication number
EP2453828A1
EP2453828A1 EP10728714A EP10728714A EP2453828A1 EP 2453828 A1 EP2453828 A1 EP 2453828A1 EP 10728714 A EP10728714 A EP 10728714A EP 10728714 A EP10728714 A EP 10728714A EP 2453828 A1 EP2453828 A1 EP 2453828A1
Authority
EP
European Patent Office
Prior art keywords
processing step
milling tool
outer contour
milling
region
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.)
Withdrawn
Application number
EP10728714A
Other languages
German (de)
English (en)
Inventor
Elmar Hock
Stefan Fecher
Lothar VÖLKL
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.)
Degudent GmbH
Original Assignee
Degudent GmbH
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 Degudent GmbH filed Critical Degudent GmbH
Publication of EP2453828A1 publication Critical patent/EP2453828A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0006—Production methods
    • A61C13/0009—Production methods using a copying machine
    • 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
    • A61C13/0022—Blanks or green, unfinished dental restoration parts

Definitions

  • the invention relates to a method for producing a molding having an inner and an outer contour, in particular dental object such as coping, crown or bridge framework, wherein the molding is machined out of a blank and steps in at least two subsequent processing steps and is dressed and wherein at least after the second processing step, the molding with the remaining blank (blank) remains connected via a compound such as a circumferential ridge or a circumferential membrane-like compound preferably in the region of maximum extent (maximum circumferential line) of the molded part to be produced.
  • a compound such as a circumferential ridge or a circumferential membrane-like compound preferably in the region of maximum extent (maximum circumferential line) of the molded part to be produced.
  • a method for producing a molded part such as dental object is known, which is machined from a blank by machining. Until the final contour of the molded part is reached, it is connected to the residual blank via a web or a membrane-like connection.
  • a milling strategy with a rough milling (roughing) from outside to inside and a subsequent fine milling (finishing) of the outer surface and the inner surface is provided.
  • a method for producing dentures according to EP-BI 443 869 proposes the use of a milling tool with a diameter between 0.5 mm and 5 mm.
  • a processing of a green compact in several steps, in each of which certain areas are processed, already machined areas being surrounded by an embedding compound (DE-A-199 30 564).
  • WO-A-02/45614 uses a blank consisting of at least one metal oxide, in particular Al 2 O 3 , TiO 2 , MgO, Y 2 O 3 and / or zirconium oxide mixed crystal, which is machined becomes.
  • the blank itself has the geometry of a cylinder.
  • a pre-sintered zirconia ceramic blank is first rough-worked with a tool at a speed of between 5,000 and 40,000 revolutions / min, and then at a rotational speed of between 5,000 revolutions per minute and 50,000, according to DE-B-01 071 Revolutions / min finely machined, with the feed rate between 20 mm / min and 5,000 mm / min.
  • the milling tool has a diameter between 0.8 mm and 4 mm.
  • WO-A-99/47065 describes a material removal from a blank made of at least one of the metal oxide powders of the group consisting of Al 2 O 3 , TiO 2 , MgO, Y 2 O 3 and zirconium oxide for producing a tooth replacement part such as tooth crown or bridge.
  • Mixed crystal with milling tools at speeds in the range between 10,000 revolutions / min and 50,000 revolutions / min, a delivery between 1 mm and 15 mm and a feed rate between 3.5 cm / sec and 10 cm / sec.
  • a dental workpiece such as a crown is first machined from its inside by roughing and finishing and then from its outside by roughing and finishing.
  • a method for material-removing machining of workpieces according to DE-A-IO 2005 001 600, the use of a cylindrical or frustoconical rotating tool, which is brought both the front side and the shell side with the workpiece in engagement.
  • an intermediate step is inserted for the preparation of a dental prosthesis between roughing and finishing step in order to reduce the stress of the milling tool used for the production of the dental prosthesis and / or the workpiece in the finishing step.
  • the present invention is based on the object, a method of the type mentioned for the production of a molded part, in particular a pre-sintered metal oxide such as zirconium oxide mixed crystal so that in the machining, especially in a CAM milling machine at high feed rate produced a molding desired final geometry can be without damage, especially in the edge area, such as breakouts occur.
  • a pre-sintered metal oxide such as zirconium oxide mixed crystal
  • the invention essentially provides that the molded part in a first processing step in its inner contour area and between the connection and the interior (cavity) of the molding limiting edge extending outer contour area is scrubbed that the molded part in a second processing step in his outer contour region is scrubbed above the compound, that in a third processing step, the outer contour region above the compound is finished, that the inner contour region in a fourth Machining step is vorgelichtet and that the inner contour area is finished step in a fifth processing step.
  • the outer contour region between the connection and the lower edge has residual material, that is to say material which protrudes beyond a desired allowance, can be removed by pre-finishing.
  • the finishing of this outer contour area succeeds after the finishing of the inner contour area.
  • a milling strategy is proposed, in which, in departure from the method specified by the prior art blank for working out of the molding is not successively processed from coarse to fine decreasing diameter with cutting tools, but between the roughing and finishing a process step is interposed, at the blank is processed coarser than when finishing.
  • This pre-sizing step means that residual material milling occurs to remove material that protrudes above the predetermined allowance after roughing.
  • the coarse-fine-coarse machining surprisingly results in the advantage that a defect-free molded part can be produced without causing damage, especially in the edge region.
  • a roughing out of the molding from a blank wherein at least one allowance is maintained with respect to the final contour to be achieved.
  • the allowance can be in the range between 0.1 mm to 1 mm.
  • the rough machining is done with the same milling tool, the z. B. has a diameter between 2 mm and 4 mm, in particular in the range of 3 mm.
  • the feed rate can be between 2 m / min and 6 m / min, in particular between 2.5 m / min and 4 m / min.
  • a working out of the molding from the blank is further carried out such that after the rough machining of the inner and outer contour of the molding remains connected via a circumferential ridge or a circumferential membrane-like connection with the rest blank.
  • the thickness of the web amounts to between 0.4 mm to 2 mm, in particular to 0.8 mm.
  • there is a sizing of the outer contour wherein at the same time the circumferential web or the membrane-like compound is severed sections.
  • the peripheral web is severed at a distance between 5 mm and 30 mm and over a length of between 1 mm and 5 mm.
  • a milling tool with a diameter between 0.5 mm and 1.5 mm, in particular about 1 mm should be used in the third processing step.
  • the feed rate should be between 1 m / min and 6 m / min, in particular between 2 m / min and 6 m / min.
  • a milling tool of larger diameter in particular between 1.5 mm and 3 mm, preferably approximately 2 mm, is used to mill out residual material of the inner contour, with residual material being the one projecting beyond the desired allowance.
  • the feed rate should be between 2 m / min and 6 m / min, preferably between 2.5 m / min and 4 m / min in this processing step.
  • the constraint is observed that the diameter of the milling tools used in the first and second processing step are greater than the fourth processing step and that the corresponding tool has a larger diameter than that in the third and fifth processing step.
  • the outer contour region extending between the circumferential web or the circumferential membrane-like connection and the interior of the molded part is machined in the first processing step after the roughing of the inner contour, d. H. is scrubbed.
  • the circumferential web or the membrane-like compound from the blank is worked out in such a way that the web or the membrane-like compound in the region of greatest circumference, d. H. maximum circumferential line of the outer contour extends, viewed in the longitudinal axis direction of the blank, or, if this is a dental object, in the insertion direction of this.
  • the roughing in the first and / or second processing step should step with a milling tool with a speed between 10,000 revolutions / min and 25,000 revolutions / min or pre-finishing in the fourth processing step at a speed between 20,000 revolutions / min and 40,000 revolutions / min and the finishing in the third and / or fifth processing step be carried out at a speed between 25,000 revolutions / min and 50,000 revolutions / min.
  • each used milling tool should be between 1 mm and 9 mm in the first and second processing step, in which the inner or outer contour are coarsely machined from the blank, wherein the delivery by the desired allowance of the final contour of the molding is limited.
  • This allowance should be between 0.1 mm and 1 mm, preferably in the range of 0.4 mm.
  • the pre-finishing delivery corresponds to a height equal to the amount of residual material above the allowance from the final contour; during pre-finishing, the areas not removed during roughing are milled off, which protrude above the allowance.
  • infeed takes place over a height corresponding to the oversize over the final contour.
  • the tool is in particular a single or double-edged radius cutter.
  • a Z constant milling is carried out with the Z axis running in the direction of the axis of the blank.
  • the milling tool is moved by the CAM milling machine software in planes of equal Z coordinates to remove material from the blank.
  • the milling tool almost jumps from place to place.
  • a circular processing takes place.
  • Fig. 3 shows the molding with residual blank of FIG. 2 in plan view
  • the crown 10 is machined out of a preform sintered, that is to say not yet sintered through, which consists of a metal oxide, in particular zirconium oxide mixed crystal.
  • the crown to be produced 10 has, in accordance with the shrinkage occurring during sintering dimensionally on this compensating magnification compared to the finished dentures.
  • the blank preferably has a disk shape with a diameter of 100 mm and a thickness of 20 mm, so that at the same time several objects in a CAM milling machine can be worked out of the blank.
  • Basic procedural measures for controlling a corresponding CAM milling machine are z. As the WO-A-90/15376, so that reference is made to the relevant disclosure.
  • the inside 12 of the crown 10 is milled out of the blank with a desired allowance by roughing.
  • the allowance is shown in Fig. 1 by the dotted area 14, wherein the Fräsaufhold a thickness of z. B. may have 0.4 mm.
  • the outer side 16 is also machined by roughing, using the same cutter used for inner contour machining.
  • the roughing of the outer side 16 is performed in accordance with that of the inner contour 12, so that there is an oversize compared to the final contour, which is symbolized by the area 18.
  • the object remains connected to the remaining part of the blank, that is to say to the remaining blank 20 via a circumferential web 22, wherein the web 22 extends in the region of maximum circumferential line of the restoration to be produced, ie the crown 10, considered in the direction of insertion of the dental object.
  • the web-like connection can also be referred to as a flat or corrugated disc, which should have a thickness of about 0.8 mm, in order to ensure a secure support of the molding.
  • the roughing is z. B performed with a 2-edged radius cutter with a diameter of 3 mm and a feed rate of preferably 3 m / min to 5 m / min.
  • the infeed ie the depth at which the milling tool dips into the blank, should be between 1 mm and 9 mm.
  • the peripheral web 22 extends at a distance from the preparation border, ie lower edge 24 of the crown 10. Therefore, the outer contour region 26, between the circumferential web 22 and the rim 28 delimiting the cavity 28 of the crown 10 after roughing of the inner contour region 12 coarsely machined (roughed) before a rough milling of the remaining outer contour region 16 takes place.
  • the "lower half" of the crown 10 is coarsely machined, which consists of the complete inner side 12 and the region 26 of the outer side 16, between the provided for holding the crown 10 circumferential connection 22 and the lower edge 24 extends.
  • the outer contour region is finished to the final outer contour 30 of the crown 10 in a subsequent milling operation, namely the region which extends above the circumferential web 22 .
  • the sizing can also be done with a 2-edged radius cutter using RPM's between 25,000 and 50,000.
  • the delivery corresponds to the amount of the allowance.
  • the circumferential web 22 is severed in certain regions, specifically apertures 32, 34, 36 are worked out over a length of 1 mm to 5 mm at a distance of 5 mm to 30 mm. This is evident from FIG. 3. Thus, web-like connections 38, 40, 42 remain between the molded part to be produced and the residual blank 20.
  • the third processing step ie the actual second milling cycle, not worked with a tool of the next smaller size - as is customary in the prior art - but with the tool usually provided for the finishing.
  • a cutter with a diameter of in about 1 mm and a feed of up to 4 m / min worked.
  • the outer contour above the disc-shaped connection web 22
  • the disc-shaped connection perforated so that evenly, distributed over the entire circumference, several web-like compounds remain, the may have a width of 1 mm to 5 mm.
  • a milling tool for further processing of the inner contour region 12, a milling tool is used, which has a larger diameter than that for finishing the outer contour 30, in order to carry out a pre-finishing of the inner contour region 12, in which regions of the inner contour are milled which protrude beyond the desired allowance.
  • a corresponding area is indicated purely by way of example in FIG. 1 by reference numeral 44.
  • the pre-finishing ie the residual material milling in the inner contour region 12, can be carried out with a 2-edged radius cutter of a diameter of 2 mm.
  • the feed rate should be in the range of 4 m / min.
  • the inner contour region 12 is finished to the final dimension of the inner contour 46.
  • the web-like connections 38, 40, 42 remain.
  • the sizing to final dimension of the inner contour 46 is carried out with a preferably 2-edged radius cutter with a diameter of 1 mm, with a feed of 3 m / min and rotational speeds of 25,000 revolutions / min to 50,000 revolutions / min are to be preferred.
  • the machine dynamics of a milling machine can be optimally utilized, so that economical processing times can be achieved.
  • a high accuracy of fit despite shortened processing time is achievable.
  • there is a very good quality of the edge 24, without rework is required.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Milling Processes (AREA)
  • Dental Prosthetics (AREA)

Abstract

L'invention porte sur un procédé de fabrication d'une pièce usinée comportant un contour intérieur et un contour extérieur, la pièce usinée étant fabriquée à partir d'une ébauche par usinage avec enlèvement de copeaux, et étant dégrossie et étant finie dans au moins deux étapes d'usinage successives. Pour pouvoir, lors de l'usinage par enlèvement de copeaux, et à une grande vitesse d'avance, fabriquer une pièce usinée ayant la géométrie finale souhaitée, il est proposé que, dans une première étape d'usinage, la pièce usinée soit dégrossie dans une première zone, que, dans une deuxième étape d'usinage, la pièce usinée soit dégrossie dans une deuxième zone qui est différente de la première zone, que dans une troisième étape d'usinage la deuxième zone soit finie, et que, dans une quatrième étape d'usinage, la première zone soit pré-finie pour subir ensuite une finition dans une cinquième étape d'usinage.
EP10728714A 2009-07-13 2010-07-08 Procédé de fabrication d'une pièce usinée comportant un contour intérieur et un contour extérieur Withdrawn EP2453828A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009026159A DE102009026159A1 (de) 2009-07-13 2009-07-13 Verfahren zur Herstellung eines eine Innen- und Außenkontur aufweisenden Formteils
PCT/EP2010/059772 WO2011006816A1 (fr) 2009-07-13 2010-07-08 Procédé de fabrication d'une pièce usinée comportant un contour intérieur et un contour extérieur

Publications (1)

Publication Number Publication Date
EP2453828A1 true EP2453828A1 (fr) 2012-05-23

Family

ID=42697565

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10728714A Withdrawn EP2453828A1 (fr) 2009-07-13 2010-07-08 Procédé de fabrication d'une pièce usinée comportant un contour intérieur et un contour extérieur

Country Status (3)

Country Link
EP (1) EP2453828A1 (fr)
DE (1) DE102009026159A1 (fr)
WO (1) WO2011006816A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017117491A1 (de) 2017-08-02 2019-02-07 Ivoclar Vivadent Ag Verfahren zur Erzeugung einer Prothese oder Teilprothese
US11090141B2 (en) 2016-08-10 2021-08-17 Ivoclar Vivadent Ag Method for producing a prosthesis or partial prosthesis

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5184306A (en) * 1989-06-09 1993-02-02 Regents Of The University Of Minnesota Automated high-precision fabrication of objects of complex and unique geometry
US5128870A (en) 1989-06-09 1992-07-07 Regents Of The University Of Minnesota Automated high-precision fabrication of objects of complex and unique geometry
US6428252B1 (en) * 1997-04-02 2002-08-06 Tino Oldani Method for machining
EP0943296A1 (fr) 1998-03-17 1999-09-22 Eidgenössische Technische Hochschule Zürich Couronnes et/ou ponts dentaires
DE19930564A1 (de) 1999-04-16 2000-10-19 Kaltenbach & Voigt Verfahren zur Herstellung medizinischer, zahnmedizinischer, zahntechnischer und technischer Teile aus Keramik
WO2002045614A1 (fr) 2000-12-07 2002-06-13 Eidgenössische Technische Hochschule Zürich Nichtmetallische Werkstoffe Dispositif de retenue pour une ebauche en ceramique
DE10107451B4 (de) * 2001-02-14 2004-04-15 3M Espe Ag Verfahren zur Herstellung von Zahnersatz, nach dem Verfahren herstellbares Zahnersatzteil sowie vorgesinterter Rohling
SE0101035L (sv) * 2001-03-23 2002-09-24 Decim Ab Apparat och metod för att producera en tandrestaurering
DE20105248U1 (de) 2001-03-26 2002-08-01 Kaltenbach & Voigt Fräs-/Schleifmaschine zur Herstellung von zahnmedizinischen Werkstücken
DE10156156B4 (de) * 2001-11-15 2005-04-21 3M Espe Ag Verfahren zur Herstellung von Zahnersatz
US20070108645A1 (en) 2003-11-26 2007-05-17 Philip Von Schroeter Method for producing a molded piece
DE102005001600B4 (de) 2004-11-30 2011-08-18 FOLLOW ME! Technology Systems GmbH, 81675 Verfahren zur Material abtragenden Bearbeitung von Werkstücken und Werkstück bzw. Formelement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011006816A1 *

Also Published As

Publication number Publication date
DE102009026159A1 (de) 2011-01-27
WO2011006816A1 (fr) 2011-01-20

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