WO2000010480A1 - Systeme de fabrication d'elements de prothese dentaire - Google Patents

Systeme de fabrication d'elements de prothese dentaire Download PDF

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Publication number
WO2000010480A1
WO2000010480A1 PCT/EP1999/006169 EP9906169W WO0010480A1 WO 2000010480 A1 WO2000010480 A1 WO 2000010480A1 EP 9906169 W EP9906169 W EP 9906169W WO 0010480 A1 WO0010480 A1 WO 0010480A1
Authority
WO
WIPO (PCT)
Prior art keywords
blank
crown
intended
region
pulp
Prior art date
Application number
PCT/EP1999/006169
Other languages
German (de)
English (en)
Inventor
Ralph G. Luthardt
Original Assignee
Girrbach Dental 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 Girrbach Dental Gmbh filed Critical Girrbach Dental Gmbh
Priority to EP99967814A priority Critical patent/EP1105065A1/fr
Priority to AU59705/99A priority patent/AU5970599A/en
Publication of WO2000010480A1 publication Critical patent/WO2000010480A1/fr

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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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/70—Tooth crowns; Making thereof
    • A61C5/77—Methods or devices for making crowns

Definitions

  • the invention relates to a system for the manufacture of tooth replacement parts intended for prepared teeth in the form of, for. B. crowns or crown frameworks or bridges or bridge frameworks.
  • dental prostheses are manufactured using CAD / CAM processes, whereby machining processes such as grinding, milling or spark erosion are used.
  • Solid material blocks are always used as the starting material in order to be machined to achieve the desired geometry. Due to the high-strength materials used, in particular ceramics, the tool itself wears out if the material is removed significantly in order to obtain the geometry. It is therefore necessary to use elaborately controlled machine tools that take wear into account. The resulting high investment costs prevent extensive use of appropriate processes.
  • a blank for the production of molded technical parts which has a shape such that subsequent material removal can be reduced to a minimum.
  • recesses are provided in a block material to be machined, which start from the peripheral wall.
  • the present invention is based, inter alia, on the problem of minimizing the material to be processed for the manufacture of dental prosthetic items, while at the same time increasing the manufacturing accuracy. Furthermore, it is to be ensured that when the blanks are machined, tool wear does not occur to an extent that could influence the final shape without the wear itself having to be taken into account as a correction variable during machining. Finally, the processing time for the production of dental prosthetic items should be reduced.
  • the problem is essentially solved by a system for producing dental prostheses intended for prepared teeth in the form of crowns or crown frameworks or bridges or bridge frameworks in that the system comprises groups of blanks in that the blanks of a respective group have the same internal and external geometries that a group of blanks of the same geometry is assigned to at least two different tooth types, that each blank has an internal geometry that corresponds to the physiological limit of the dental preparation form and is the same or approximately the same as the pulp chamber of a youthful tooth of the assigned smallest tooth type, that each The blank has an external geometry that corresponds to a physiological tooth shape and, for example, in the case of a blank intended for a crown, has the same or approximately the same size anatomical external shape of the assigned largest tooth type and f r is a crown scaffold certain blank equal to or approximately equal to the melting dentin border of the associated largest tooth type. Partial features of the system are also inherent.
  • a system of optimized preformed or manufactured blanks is made available, whereby characteristic geometries of the different tooth types are used to minimize the materials used and thus to minimize machining. Consequently, high-precision dental prostheses can be produced with inexpensive processing machines, the tool wear occurring being neglected due to the minimization of the material to be processed.
  • An idealized blank shape is therefore made available, which is designed based on the dimensions of conventional teeth (e.g. the limit dimensioning), namely on the one hand the juvenile pulp and on the other hand the large-sized anatomical external shapes of the respective tooth types, which are identical to each other regardless of the geometric differences Geometry can be assigned. As a result, the number of blanks to be made available is reduced without having to accept the disadvantages known from the prior art, namely to carry out extensive internal and external processing of the starting material.
  • the outer shape of the blank is consequently made in a geometry which, in the course of preparation and restoration with veneer crowns, comes close to the desired external shape.
  • the internal shape is designed in accordance with the geometry of the usual tooth stump prepared by the dentist, which approximates the shape of the tooth stump to be treated.
  • the inner shape is cylindrical or tapered in the direction of the occlusal surface, thereby avoiding expensive internal machining.
  • the design of the outer shape corresponds to an idealized tooth shape.
  • the crown framework that is Inner shape adapted to the geometry of the tooth stump prepared by the dentist, which approximates the shape of the tooth stump to be treated.
  • the interior is also cylindrical or tapered towards the occlusal surface.
  • a group of blanks of the same inner and outer geometry is intended for incisors of the upper and lower jaw and / or canines of the upper and lower jaw and / or premolars of the upper and lower jaw and / or molars of the upper and lower jaw .
  • This design of blanks of the same geometry for tooth types of different shapes simplifies the manufacture of the blanks on the one hand and the processing on the other hand, since processing machines such as CNC machines can be operated with less control engineering effort due to the standardized starting geometries of the blanks.
  • the blank intended for a premolar for use as a crown in the area of the pulp maple and occlusal has a wall thickness of 2.9 mm.
  • the wall thickness in the area of the pulp maple should be 3.2 mm.
  • the wall thickness in the area of the pulp maple is 3.5 mm. If a blank for forming a crown is intended for canines, the wall thickness in the area of the pulp maple should be 3.5 mm.
  • the invention provides that the blank intended for a premolar for use as a crown framework in the area of the pulp maple has a wall thickness of 1.6 mm.
  • the wall thickness in the area of the pulp homoma should be 1.8 mm.
  • the wall thickness in the area of the pulp maple is 2.0 mm.
  • the wall thickness in the area of the pulp horn should be 2.5 mm.
  • the blank intended for a premolar for use as a crown has a wall thickness of 2 mm in the occlusal region.
  • the wall thickness in the occlusal area should be 2.2 mm.
  • the wall thickness in the incisal area is 3.5 mm. If a blank is intended for the production of a crown for canines, the wall thickness in the incisal area should be 3.5 mm.
  • the blank intended for a premolar for use as a crown framework has a wall thickness of 1.5 mm in the occlusal region.
  • the wall thickness in the occlusal area should be 1.8 mm.
  • the wall thickness in the incisal area is 2.5 mm. If a blank for forming a crown framework is intended for canine teeth, the wall thickness in the incisal area should be 2.8 mm.
  • metals, high-performance ceramic materials aluminum oxide ceramic, zirconium dioxide ceramic, oxide ceramic based on zirconium dioxide with additions of different cubic and / or tetragonal stabilizing oxides and an aluminum oxide ceramic content of 10 - 50%
  • glass ceramic and composite materials come into question as materials for the blanks.
  • the blank can have protruding projections in order to be able to position it clearly in the processing machine via determination and clamping surfaces and thus to be able to process it. This results in a simplification, since the individual fitting of a block of material to be processed, which is required according to the prior art, is omitted in a holder.
  • Fig. 1 is a schematic diagram of a prepared tooth with this blank and assigned
  • Fig. 2 premolars of different geometries, which blanks are assigned the same outer and inner geometries to form a crown.
  • FIG. 1 shows, in principle, a prepared tooth stump 10 to which a prefabricated blank 12 is assigned in order to form a crown framework.
  • the course of the outer geometry of the tooth body 10 is illustrated by line 14.
  • the pulp 16 is surrounded by the tooth stump 10.
  • the blank 12 prefabricated according to the teaching of the invention has a geometry which ensures that the outer contour of the tooth stump 14 above the tooth neck runs completely within the material of the blank 12.
  • the interior enclosed by the blank 12 is larger than the extension of the pulp 16. Since the pulp is covered with a tooth stump, the interior of a blank can consequently always be designed such that it is equal to or larger than a pulp.
  • the internal geometry is the same or approximately the same as the external geometry of a young pulp.
  • the blank should preferably have an outer geometry which corresponds to the enamel-dentin limit of the largest tooth type, which are to be covered by blanks of one and the same geometry.
  • an outer geometry other than the norm is provided according to the invention, whereas the inner geometry corresponds to the blanks for crown frameworks, namely the same or approximately the same as the outer geometry of a youthful pulp.
  • the outer geometry of the blank is designed for the large-dimensioned anatomical outer shape of the largest tooth, which is to be covered by blanks of the same dimension, that is to say of a blank type.
  • mean values are assumed, which can be found in the relevant textbooks (see, for example: Schaaf, R .: “Studies on the dimensions of enamel and dentin on lower anterior teeth and premolars” Inaugural dissertation, Würzburg 1971; Schuhmacher, Schmidt: “Anatomy and biochemistry of teeth”, VEB Volk und Pass 1976; Hügel, R .: “Studies on the wall thickness of enamel and dentin on upper anterior teeth and premolars", inaugural dissertation, Würzburg 1970; Woolfel, JB, Scheid, RC: “Dental Analomy - It's Relevance to Dentistry", 5th edition, Williams & Wilkins 1997). It is clear from FIG. 2 that the different upper jaw premolar
  • blanks 32, 34, 36, 38 of the same dimensioning can be used, which consequently only have to be minimally machined, since the inside and outside geometry of the same
  • the course of the prepared tooth stump 40, 42, 44, 46 or the external geometry of the restored tooth is adapted.
  • blanks are formed which make it possible to produce dentures not from block material but from prefabricated parts, which enable the material to be machined to be minimized while at the same time increasing the manufacturing accuracy without tool wear to an extent that would lead to a distortion of the final geometry of the denture, which would require reworking.

Abstract

L'invention se rapporte à un système de fabrication d'éléments particuliers de prothèse dentaire pour des dents préparées, sous la forme par exemple de couronnes, armatures coronaires, bridges et/ou armatures de bridges. Pour réduire à un minimum le matériau à travailler pour la fabrication d'éléments de prothèse dentaire, en augmentant simultanément la précision de travail, selon la présente invention, le système comprend des groupes d'ébauches (12), les ébauches d'un groupe donné présentent des géométries interne et externe similaires, un groupe d'ébauches de géométrie similaire est affecté à au moins deux types différents de dents, chaque ébauche présente une géométrie interne qui correspond à la limite physiologique du moulage dentaire préparatoire et qui est similaire à la chambre pulpaire d'une dent jeune du type de dent respectif le plus petit. En outre, chaque ébauche présente une géométrie externe qui présente les mêmes dimensions ou presque que la forme anatomique externe du type de dent respectif le plus grand pour une ébauche destinée à une couronne, et qui présente les mêmes dimensions ou presque que le profil de la limite émail-ivoire du type de dent respectif le plus grand pour une ébauche destinée à une armature coronaire.
PCT/EP1999/006169 1998-08-22 1999-08-23 Systeme de fabrication d'elements de prothese dentaire WO2000010480A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99967814A EP1105065A1 (fr) 1998-08-22 1999-08-23 Systeme de fabrication d'elements de prothese dentaire
AU59705/99A AU5970599A (en) 1998-08-22 1999-08-23 System for manufacturing dental prosthesis parts

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19838239.1 1998-08-22
DE19838239A DE19838239A1 (de) 1998-08-22 1998-08-22 Preform

Publications (1)

Publication Number Publication Date
WO2000010480A1 true WO2000010480A1 (fr) 2000-03-02

Family

ID=7878419

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/006169 WO2000010480A1 (fr) 1998-08-22 1999-08-23 Systeme de fabrication d'elements de prothese dentaire

Country Status (4)

Country Link
EP (1) EP1105065A1 (fr)
AU (1) AU5970599A (fr)
DE (1) DE19838239A1 (fr)
WO (1) WO2000010480A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170360535A1 (en) * 2014-12-22 2017-12-21 Dental Wings Inc. Pre-forms and methods for using same in the manufacture of dental prostheses

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10150647A1 (de) * 2001-10-13 2003-04-30 Rauter Vita Zahnfabrik Verfahren und Formelement zur Herstellung von Zahnersatz
DE10252298B3 (de) 2002-11-11 2004-08-19 Mehl, Albert, Prof. Dr. Dr. Verfahren zur Herstellung von Zahnersatzteilen oder Zahnrestaurationen unter Verwendung elektronischer Zahndarstellungen
DE102006021640B3 (de) 2006-05-08 2007-10-11 Sirona Dental Systems Gmbh Verfahren, Rohling, Rohlingssortiment, Zahndatenbank und Rohlingsdatenbank mit vorgefertigter Teilendfläche zur Herstellung von Zahnersatzteilen
DE102011008074A1 (de) 2011-01-07 2012-07-12 Martin Tank Verfahren und Zahnrestaurationsermittlungssystem zur Ermittlung von Zahnrestaurationen
CN104168853A (zh) 2012-02-29 2014-11-26 义获嘉伟瓦登特公司 用于制造牙科修补物的坯件
DE102018123318A1 (de) * 2018-09-21 2020-03-26 Kulzer Gmbh Vorprodukt zur Herstellung von Prothesenzähnen und Verfahren zu dessen Herstellung und Verarbeitung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160797A1 (fr) 1984-03-06 1985-11-13 Werner H. Dr.med.dent. Mörmann Ebauche pour la fabrication de pièces façonnées en technique dentaire et utilisation de celle-ci
FR2567017A1 (fr) * 1984-07-09 1986-01-10 Hennequin Jean Pierre Preforme pour l'usinage de protheses dentaires
US5151044A (en) * 1989-05-12 1992-09-29 Rotsaert Henri L Blanks for the manufacture of artificial teeth and crowns
WO1998032392A1 (fr) * 1997-01-23 1998-07-30 Hajjar Victor J Procede et appareil de restauration dentaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160797A1 (fr) 1984-03-06 1985-11-13 Werner H. Dr.med.dent. Mörmann Ebauche pour la fabrication de pièces façonnées en technique dentaire et utilisation de celle-ci
FR2567017A1 (fr) * 1984-07-09 1986-01-10 Hennequin Jean Pierre Preforme pour l'usinage de protheses dentaires
US5151044A (en) * 1989-05-12 1992-09-29 Rotsaert Henri L Blanks for the manufacture of artificial teeth and crowns
WO1998032392A1 (fr) * 1997-01-23 1998-07-30 Hajjar Victor J Procede et appareil de restauration dentaire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170360535A1 (en) * 2014-12-22 2017-12-21 Dental Wings Inc. Pre-forms and methods for using same in the manufacture of dental prostheses

Also Published As

Publication number Publication date
AU5970599A (en) 2000-03-14
DE19838239A1 (de) 2000-03-02
EP1105065A1 (fr) 2001-06-13

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