EP1018974A1 - Technique de fabrication de corps dentaire et ebauche correspondante - Google Patents

Technique de fabrication de corps dentaire et ebauche correspondante

Info

Publication number
EP1018974A1
EP1018974A1 EP98944410A EP98944410A EP1018974A1 EP 1018974 A1 EP1018974 A1 EP 1018974A1 EP 98944410 A EP98944410 A EP 98944410A EP 98944410 A EP98944410 A EP 98944410A EP 1018974 A1 EP1018974 A1 EP 1018974A1
Authority
EP
European Patent Office
Prior art keywords
blank
geometry
restoration body
machined
machining
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Withdrawn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
EP98944410A
Other languages
German (de)
English (en)
Inventor
Tomas Rostvall
Anders Sundh
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.)
Decim AB
Original Assignee
Decim 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 Decim AB filed Critical Decim AB
Publication of EP1018974A1 publication Critical patent/EP1018974A1/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Withdrawn legal-status Critical Current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
    • A61C13/0022—Blanks or green, unfinished dental restoration parts
    • 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

Definitions

  • the present invention concerns a procedure for the production by machining of a dental restoration body for use when mending, restoring or building up a tooth or row of teeth, as well as a blank intended for the production of the dental restoration body by machining.
  • Numerically-controlled machine tools are today used for producing dental restoration bodies such as crowns for building up a tooth and inserts for filling a drilled-out or damaged tooth. These machine tools commonly employ what is known as CAM technology.
  • the restoration body is built-up in a software program, and with knowledge of the geometry of a worked piece or a blank, the computer can work out a pattern of movements for a known machine tool, usually a milling or grinding tool, that by cutting away at the blank, produces the desired restoration body.
  • zirconium Zr0 2 . Blanks of zirconium ceramic can be produced in several shades of colour that resemble those of teeth and, like several other candidate ceramics, it is a hard material that is very resistant to being worn down.
  • the blank is at present commonly a cylindrical body with a specified diameter and extension.
  • the turning of the blank at its point of attachment is thus not of significance. Instead, what is influential regarding the position of the blank is how far it projects out from its attachment. Describing this spatial position and the geometry for a CAM system is easy.
  • the small dimensions and the detailed shaping of restoration bodies for dental care place just such high demands on the machine tool.
  • the forming of shapes complementary to, for example, a hole drilled in a tooth or a tooth ground-down to accommodate a crown, requires great accuracy in the machining.
  • An abrasive circular tool with a diameter of 1 mm can be named as an example of a tool that can be used.
  • the small dimensions and a relatively long free projection are necessary to achieve the details in the surface structure and to gain access all around the body.
  • the problem of machine tool wear is especially evident when producing a crown.
  • the underneath of a crown is provided with a cavity for accommodating a ground-down tooth or other type of attachment. Gaining access to the cavity is a machine tooling operation that is time- consuming and hard on the wear of the tool.
  • the development of heat at prolonged, locally situated machining brings with it a significant risk of crack formation. If cracks form, the result will not be acceptable and the production has to be started afresh with a new blank.
  • the problems with current blanks are: that the hardness of the blank leads to significant wear of the machine tool and prolongs the time required for the machining operation: that the cylindrical shape of the blank leads requires a large amount of rough cutting before the actual shaping can begin: and that cracks tend to form in the material when machining holes or cavities.
  • These problems act to raise the cost of producing restoration bodies by machining in general, and in particular when the bodies are made of hard materials such as ceramics.
  • the objective of the present invention is to overcome these problems and achieve a blank intended for producing dental restoration bodies by machining that permits reduced machining time and reduces the wear on the tools.
  • An additional objective of the invention is to achieve a blank whose characteristics can be read by a machine.
  • a further objective is to achieve a blank that can be stored in a magazine for mechanical/automated loading to a position for machining.
  • Fig. 1 shows schematically a system for performing the procedure according to the present invention.
  • Fig. 2 shows a side view of a blank according to one embodiment of the present invention.
  • Fig. 3 shows an end view of the blank according to fig. 2.
  • Fig. 4 shows a perspective view from an angle at the front of the blank according to fig. 2.
  • Fig. 5 shows a further perspective view of the blank according to fig. 2.
  • Fig. 1 shows schematically a system for producing dental restoration bodies.
  • the system includes a computer (not shown) for transforming geometric information about a specified restoration body and a specified blank to a pattern of movements for a specified machine tool; as well as a numerically-controlled machine tool 2 for performing the machining. It is advantageous if the tool has several axes of rotation for both the tool holder 3 and the blank holder 4.
  • the blank according to the present embodiment is shown schematically in figs. 2 to 4.
  • the blank has a section for attaching firmly that includes a cylindrical part 5 intended for setting up in the machine tool.
  • a cylindrical part 5 intended for setting up in the machine tool.
  • the cylindrical part 5 is grasped in the traditional manner by the holding chuck 4 for the blank in the machine tool.
  • the centre axis of the cylindrical part thus coincides with the axis of rotation commonly present in the chuck for the blank.
  • the part intended for machining 7 has a roughly pre-formed geometry for different types of dental restoration bodies.
  • the part to be machined 7 has an essentially rectangular cross-sectional shape when seen in a section at right angles to the axis of the blank 6.
  • the rectangular shape reduces the need for rough cutting when producing crowns, for example, in comparison with a blank with a circular cross-section.
  • the blank is preferably available in a set of different sizes of the machined part 7 to minimise machining when producing the dental restoration body in question.
  • a thinner waist of material 8 is arranged between the cylindrical part 5 and the machined part 7.
  • the waist has a smaller cross-sectional area at its surface than both the cylindrical part and the machined part.
  • the blank In order that the blank can be handled mechanically in a numerically-controlled machine, it is provided with means for controlling its orientation. These can include means that are complementary in relation to means arranged on a supporting device, such as. for example, a magazine for blanks, a blank holder, a transport belt for blanks or similar. It can thus be ensured that the blank, when it is located in a magazine, for example, is always oriented in the same way and that it can be collected from that point or delivered in a specified orientation. The exact position and orientation of the blank is thus known to the machine tool and to the software program that controls it.
  • the device for controlling orientation includes a recess 9 arranged in a specified position.
  • the recess 9 is positioned at the blank so that when the blank is introduced into a magazine 10 with the correct orientation, the recess accommodates a projection arranged in the magazine. If, however, the blank is not orientated in the pre-determined way when it enters the magazine, the projection of the magazine will prevent the blank from entering the magazine, when the risk of an incorrectly orientated blank is eliminated. That referred to as the human factor has been eliminated as a source of error.
  • the blank according to the present invention includes a collar 11 that interacts with the supporting device.
  • the aim of the collar is to interact with the supporting device even when the machining of the body has been completed so that the machined body, with or without the shaped body, can be mechanically transported to the magazine and kept there.
  • the blank has a collar to be accommodated in the complementary shaped device of the magazine and a recess for guiding its orientation and interaction with a complementary device in the magazine.
  • the recess that specifies direction can be replaced by a projection and the collar can be replaced by a groove or waist, whereby the complementary formed devices arranged in the magazine achieve the function named above.
  • the blank has a recess 12 arranged in the part intended for machining 7.
  • the recess 12 is arranged on a surface parallel with the axis of the blank 6 and is essentially pyramid or cone-shaped with a centre axis arranged at right angles to the axis of the blank 6. In this way, the rough cutting that takes place prior to the machined shaping of the cavity of the crown for accommodating the ground-down stump of a tooth or other point of attachment is reduced.
  • the recess can even be arranged, for example, at the free end of the machined part 7, whereby an axis of symmetry for the recess or hole can coincide or be parallel with the axis of the blank 6.
  • the blank has a machine-readable code that corresponds to a code key.
  • the key to the code is in turn preferably arranged in machine-readable code form, e.g. a computer file of information that can be fed into the computer system that controls the procedure and the machine tool.
  • the code for the blank is arranged at the attachment part 5.
  • the code includes a flat area 13 that extends out from the free end of the cylindrical attachment part for a known distance in towards the attachment point.
  • the flat section is arranged at a known distance from the axis of the blank 6 that is less than the radius of the attachment part.
  • the blanks arranged in the magazine, supported by the collars and with their attachment parts extending outwards can in this way be read by a machine and their characteristics compared with awaiting orders for working dental restoration bodies .
  • the flat surface can advantageously be read using laser measurement technology. Even other remote methods of measurement or contact- based methods of measurement can be used without departing from the scope of the invention.
  • the code information can even be arranged on another position on the blank, e.g. be applied to the blank in the form of a bar code or a groove or a ridge, whereby the latter two examples can employ three co-ordinates (length, width and depth/height).
  • the flat surface named above can be given a collar and thereby be used as a stop for rotation.
  • the blank is shaped and its colour is determined by chosen ingredients. Following this, the blank is baked at about 1600 °C. It is preferable that the coding takes place as early as possible, which is why a coding that can withstand the temperature of baking is desirable.
  • a coding expressed via geometric changes of shape or combinations of such changes applied to the blank prior to the baking is one preferred solution to the problem of achieving the coding of the colour, dimensions and other characteristics of the blank as early as possible during the production of the blank.
  • the position of the coding is determined by how the blank is handled on the path to the blank holder in the machine tool.
  • the code must be accessible when the reading takes place. If all the characteristics, for example, are read after the blank has been loaded into the magazine, it is important that the code is accessible for reading when the blank is located in the magazine. If, however, the code is read prior to introduction into the magazine, the coding can be positioned at another place on the blank and can be hidden when the blank is located in the magazine.
  • the blank can be provided with a pre-formed cut-out recess or groove at a specified position and with specified dimensions intended as an attachment point for other dental restoration bodies.

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 Prosthetics (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

Cette invention, qui a trait à une technique de fabrication par usinage d'un corps de restauration dentaire à utiliser aux fins de la réfection ou de la confection d'une dent ou d'une rangée de dents, concerne également une ébauche conçue à cet effet. On compare, dans le cadre de cette technique, une information numérique relative à la géométrie du corps de restauration désiré à des informations relatives à la géométrie d'ébauches disponibles ainsi qu'une information relative à la couleur du corps de restauration désiré à des informations relatives à la géométrie des ébauches disponibles. On sélectionne le corps dont la géométrie se rapproche le plus près de celle du corps de restauration désiré, mais tout en étant légèrement supérieure, et dont la couleur s'en rapproche le plus et l'on usine cette ébauche aux formes du corps à restaurer. L'ébauche comprend une partie (5) de fixation destinée à l'assujettir solidement durant l'usinage et une partie à usiner (7), à la géométrie déterminée. Il est, de ce fait, possible de ménager entre ces deux parties un étranglement dans le matériau, un col (8), afin de faciliter l'accès à la machine outil et de réduire les quantité de matière brute à usiner lors de la fabrication du corps de restauration. Les formes géométriques de la partie usinée (7) sont dégrossies et on place, à un emplacement déterminé de l'ébauche, un dispositif de référence d'orientation directionnelle. Dans l'une des faces de la partie usinée (7) est, de surcroît, ménagé un évidement (12) aux dimensions préétablies.
EP98944410A 1997-09-17 1998-09-16 Technique de fabrication de corps dentaire et ebauche correspondante Withdrawn EP1018974A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9703353 1997-09-17
SE9703353A SE509208C2 (sv) 1997-09-17 1997-09-17 Förfarande och ämne vid maskinell framställning av dental restaureringskropp
PCT/SE1998/001660 WO1999013796A1 (fr) 1997-09-17 1998-09-16 Technique de fabrication de corps dentaire et ebauche correspondante

Publications (1)

Publication Number Publication Date
EP1018974A1 true EP1018974A1 (fr) 2000-07-19

Family

ID=20408278

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98944410A Withdrawn EP1018974A1 (fr) 1997-09-17 1998-09-16 Technique de fabrication de corps dentaire et ebauche correspondante

Country Status (4)

Country Link
EP (1) EP1018974A1 (fr)
AU (1) AU9195398A (fr)
SE (1) SE509208C2 (fr)
WO (1) WO1999013796A1 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW461806B (en) * 1999-08-02 2001-11-01 Advance Kk Method of manufacturing dental prosthesis, method of placing object and measuring device
WO2001032093A1 (fr) * 1999-11-02 2001-05-10 Jeneric/Pentron Incorporated Blocs pour cfao destinés à la fabrication de matériaux dentaires
DE20023670U1 (de) * 2000-02-08 2005-10-06 Dental Consulting Mönkmeyer S.L. Zahnsortiment und System zur Präparation von Zähnen
SE0101035L (sv) * 2001-03-23 2002-09-24 Decim Ab Apparat och metod för att producera en tandrestaurering
DE10233314B4 (de) * 2002-07-22 2007-09-06 Sirona Dental Systems Gmbh Vermessungseinrichtung für eine Vorlage und damit versehene Bearbeitungsmaschine
DE10322762B4 (de) * 2003-05-19 2013-12-05 Sirona Dental Systems Gmbh Halter für einen Rohling und Verfahren zur Vermessung der Lage und Orientierung des Halters
DE10330758B4 (de) 2003-07-07 2006-07-20 Sirona Dental Systems Gmbh Rohling zur Herstellung zahntechnischer Formteile und Verfahren zur Herstellung des Formteils
DE102004063417B4 (de) 2004-12-23 2006-08-24 Sirona Dental Systems Gmbh Rohling zur Herstellung zahntechnischer Formteile und Verfahren zur Herstellung des Formteils
US20060172263A1 (en) * 2005-02-01 2006-08-03 D4D Technologies, Lp Mill blank
WO2006120254A2 (fr) * 2005-05-13 2006-11-16 Sirona Dental Systems Gmbh Procede pour realiser un element de prothese dentaire, element de prothese dentaire ainsi obtenu, et ebauche pour realiser un element de prothese dentaire
DE102006040798A1 (de) * 2006-08-31 2008-03-20 Merz Dental Gmbh Seitenansatz
WO2009016223A2 (fr) * 2007-07-31 2009-02-05 Sirona Dental Systems Gmbh Ébauche avec codage, et procédé de fabrication de pièce de dentisterie formée
DE102007036279A1 (de) * 2007-07-31 2009-02-05 Sirona Dental Systems Gmbh Rohling mit einer Codierung und Verfahren zur Herstellung eines zahntechnischen Formteils
DE102008020720A1 (de) * 2008-04-03 2009-10-15 Sirona Dental Systems Gmbh & Co. Kg Verfahren zur Bearbeitung eines Rohlings mit einem individuellen Vergrößerungsfaktor und Rohling hierfür
DE102010002916A1 (de) 2010-03-16 2011-09-22 Sirona Dental Systems Gmbh Rohling mit Codierung zur Herstellung zahntechnischer Formteile und Verfahren zur Identifikation eines Rohling
US11045291B2 (en) 2015-08-03 2021-06-29 James R. Glidewell Dental Ceramics, Inc. Dental restoration preform and method of making the same
JP5964533B1 (ja) * 2015-08-31 2016-08-03 株式会社松風 貫通孔を有する歯科用被切削体から歯科修復物を製造する歯科修復物製造システム、該システムの動作方法、該システム用プログラム、及び、該システムで使用する歯科用被切削体
DE102016015911B4 (de) 2015-09-08 2024-03-14 James R. Glidewell Dental Ceramics, Inc. Verfahren zum Anfertigen von Zahnrestaurationen aus gesinterten Vorformen
DE102019106143A1 (de) * 2019-03-11 2020-09-17 Kulzer Gmbh Rohling zur Herstellung einer dentalen Restauration und Verfahren zu dessen Herstellung
EP4134040A1 (fr) 2021-08-09 2023-02-15 Ivoclar Vivadent AG Ébauche de fraisage et procédé de fabrication d'une restauration dentaire à partir d'une ébauche de fraisage

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19518702C2 (de) * 1995-05-22 1999-03-11 Sirona Dental Systems Gmbh Verfahren und Einrichtung zur rechnergestützten Restauration von Zähnen
FR2744012B1 (fr) * 1996-01-31 1998-04-24 Choplin Dominique Procede de fabrication de protheses dentaires

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9913796A1 *

Also Published As

Publication number Publication date
SE9703353L (sv) 1998-12-14
AU9195398A (en) 1999-04-05
SE9703353D0 (sv) 1997-09-17
WO1999013796A1 (fr) 1999-03-25
SE509208C2 (sv) 1998-12-14

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