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WO2009124869A1 - Process for producing dental prostheses by electrophoresis - Google Patents

Process for producing dental prostheses by electrophoresis Download PDF

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Publication number
WO2009124869A1
WO2009124869A1 PCT/EP2009/053882 EP2009053882W WO2009124869A1 WO 2009124869 A1 WO2009124869 A1 WO 2009124869A1 EP 2009053882 W EP2009053882 W EP 2009053882W WO 2009124869 A1 WO2009124869 A1 WO 2009124869A1
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WO
WIPO (PCT)
Prior art keywords
working model
electrophoresis
prosthesis
base plate
dental prostheses
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/EP2009/053882
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German (de)
French (fr)
Inventor
Stefan Wolz
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.)
WDT Wolz Dental Technik GmbH
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WDT Wolz Dental Technik 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 WDT Wolz Dental Technik GmbH filed Critical WDT Wolz Dental Technik GmbH
Publication of WO2009124869A1 publication Critical patent/WO2009124869A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • A61C13/0006—Production methods
    • A61C13/001—Electrophoresis coating

Definitions

  • the invention relates to the production of dental prostheses by electrophoresis.
  • Teeth but also partial dentures, bridges and single crowns understood.
  • a plaster model is usually produced by means of an impression of the patient's jaw, which is articulated with the aid of a Gebißregistratur. Based on the plaster model, the prosthesis is then manufactured.
  • the various methods are known in the art and need not be explained in detail here.
  • a method is that for reasons of stability, a metal framework is cast, which is sheathed either with plastic or ceramic.
  • a recent development in the manufacture of dental prostheses is that the data of the jaw or a model are scanned and the prosthesis by means of CAD / CAM from a hipped (hot isostatically pressed) ceramic block, preferably made of zirconia, is milled out.
  • CAD / CAM CAD / CAM procedure
  • copy milling is possible. Apart from the fact that 80 to 90% waste of material takes place during milling, the milling is associated with considerable dust development, which requires a further technical effort in order not to endanger the health of the dental technician.
  • FIG. 2 shows the cross section according to FIG. 1 with a shrunk-on thermoforming foil
  • FIG 3 shows the cross section according to Figure 2 without the part forming the prosthesis.
  • a working model 1 is prepared in a conventional manner by gypsum base plate 2 of the working model 1 is formed, which reflects the structure of the jaw of the patient.
  • the patient was provided with four implants.
  • the structure of an implant is indicated by reference numeral 4.
  • the part 3 is constructed by means of model wax and confection teeth, which corresponds in its spatial shape of the prosthesis to be produced. This technique is known to those skilled in the art.
  • the working model shown in Fig. 1 is achieved. It shows a cross section in the molar range.
  • thermoforming sheet 5 is shrunk.
  • the thermoforming sheet 5 is removed together with the part 3 of the base plate 2.
  • the thermoforming sheet 5 is separated from part 3 and placed back on the base plate 2.
  • a cavity 6, which also corresponds in its spatial shape of the prosthesis to be produced.
  • thermoforming sheet 5 Before the base plate 2 is coated with a conventional release agent and a silver paint. It is also recommended to provide the inside of thermoforming sheet 5 with a silver paint, if not anyway a conductive layer on the thermoforming sheet is present. This conductive layer can also be achieved by wetting the film surface with the slurry slurry slurry. Furthermore, several small openings 7 were placed in the thermoforming sheet 5 in the region of the tooth tips, which facilitate the entry of the slip in the electrophoresis and the exit of the air.
  • the structure of Figure 3 is immersed in a conventional alumina slurry, wherein the power supply to the silver paint layer via a zinc strip, not shown, takes place. At a current of 80 mA, the space 6 fills with alumina within 8 minutes. The resulting green body is easy to lift off from the base plate 2 because of the release agent and easily separated from the thermoforming sheet by heating. After minor cleaning work, the alumina green body is sintered at 1150 ° C.
  • the resulting raw prosthesis is then processed by aesthetic considerations by applying paint, for example, by the gum area is colored reddish and the teeth is given a more natural look. Thereafter, the usual in Alumina glass infiltration. The result is a completely satisfactory full denture.
  • inventive method is not limited to the above example.
  • any other suitable ceramic material can be used, in particular zirconia. Metals are less suitable for larger jobs for weight reasons.
  • plastic can be electrophoretically deposited under certain conditions.
  • the working model may be a compatible prosthesis, modeled model or situation model besides a model with fixed teeth.
  • thermoforming sheet For the preparation of the cavity 6, it is not necessary necessarily a thermoforming sheet.

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

Abstract

The invention relates to the production, in particular, of complete or partial dental prostheses. Therefore, it is an object of the present invention to specify a process that can be carried out more quickly by one order of magnitude while at the same time saving material and providing precise shaping. In this process, a thermoformed foil (5) is shrunk onto a working model (1). That part (3) of the working model (1) which corresponds to the desired prosthesis in terms of three-dimensional shape is removed from the base plate (2) of the working model (1) and the shaped thermoformed foil (5) is then placed on the base plate (2). This creates a hollow space that corresponds to the desired prosthesis in terms of three-dimensional shape. As an alternative to a thermoformed foil, it is possible to use other materials that can be shaped. This hollow space is filled by electrophoresis to create a green body that, after sintering and conventional processing, produces the desired prosthesis. Alumina is particularly suitable as the material. In the drawing, (4) denotes an implant abutment.

Description

Beschreibung description

Verfahren zur Herstellung dentaler Prothesen durch ElektrophoreseProcess for the preparation of dental prostheses by electrophoresis

[0001] Die Erfindung betrifft die Herstellung dentaler Prothesen durch Elektrophorese.The invention relates to the production of dental prostheses by electrophoresis.

[0002] Unter Prothese im Sinne der Erfindung werden Vollprothesen mit 16Under prosthesis according to the invention are full dentures with 16

Zähnen, aber auch Teilprothesen, Brücken und Einzelkronen verstanden.Teeth, but also partial dentures, bridges and single crowns understood.

[0003] Bei der Herstellung von Voll- oder Teilprothesen wird üblicherweise mittels eines Abdrucks des Kiefers des Patienten ein Gipsmodell hergestellt, das unter Zuhilfenahme einer Gebißregistratur einartikuliert wird. Anhand des Gipsmodells wird die Prothese dann gefertigt. Die verschiedenen Verfahren sind dem Fachmann bekannt und brauchen hier nicht im Detail erläutert werden.In the production of full or partial dentures, a plaster model is usually produced by means of an impression of the patient's jaw, which is articulated with the aid of a Gebißregistratur. Based on the plaster model, the prosthesis is then manufactured. The various methods are known in the art and need not be explained in detail here.

[0004] Ein Verfahren besteht darin, dass aus Stabilitätsgründen ein Metallgerüst gegossen wird, das entweder mit Kunststoff oder Keramik ummantelt wird.A method is that for reasons of stability, a metal framework is cast, which is sheathed either with plastic or ceramic.

[0005] Aufgrund der schlechten Haftung der unterschiedlichen Materialien aneinander sind Probleme beim Gebrauch einer solchen Prothese schon vorprogrammiert.Due to the poor adhesion of the different materials to each other problems in the use of such a prosthesis are already pre-programmed.

[0006] Eine neuere Entwicklung bei der Herstellung von dentalen Prothesen besteht darin, dass die Daten des Kiefers oder die eines Modells gescannt werden und die Prothese mittels CAD/CAM aus einem gehipten ( heiß isostatisch gepressten) Keramikblock, vorzugsweise aus Zirconia, herausgefräst wird. Alternativ zum CAD/CAM- Verfahren ist das Kopierfräsen möglich. Davon abgesehen, dass beim Fräsen 80 bis 90 % Materialverschwendung stattfindet, ist das Fräsen mit beachtlicher Staubentwicklung verbunden, die einen weiteren technischen Aufwand erfordert, um die Gesundheit des Zahntechnikers nicht zu gefährden.A recent development in the manufacture of dental prostheses is that the data of the jaw or a model are scanned and the prosthesis by means of CAD / CAM from a hipped (hot isostatically pressed) ceramic block, preferably made of zirconia, is milled out. Alternatively to the CAD / CAM procedure, copy milling is possible. Apart from the fact that 80 to 90% waste of material takes place during milling, the milling is associated with considerable dust development, which requires a further technical effort in order not to endanger the health of the dental technician.

[0007] Grundsätzlich ist bei allen bekannten Verfahren zur Herstellung von dentalen Prothesen festzustellen, dass sie einen extrem hohen Zeitaufwand erfordern, was sich dann im Preis für den Patienten niederschlägt. Bei einer gut gearbeiteten Vollprothese kann ein Zeitaufwand von 4 bis 5 Arbeitstagen erforderlich sein.In principle, in all known methods for the production of dental prostheses to determine that they require an extremely high amount of time, which then reflected in the price of the patient. A well-made full denture may take 4 to 5 working days to complete.

[0008] Es ist daher Aufgabe der im Anspruch 1 angegebenen Erfindung, ein wesentlich schnelleres Verfahren zu offenbaren, das bei geringeren Investitionen und Materialersparnis allen Anforderungen einer präzisen Formgebung genügt.It is therefore an object of the invention specified in claim 1 to disclose a much faster process that at lower Investment and material savings meet all the requirements of precise shaping.

[0009] Im Folgenden wird die Erfindung anhand der Figuren 1 bis 3 näher schrieben und erläutert.In the following the invention will be described and explained in more detail with reference to FIGS 1 to 3.

[0010] Dabei zeigt:In this case shows:

[0011] Fig.1 einen Querschnitt durch ein Arbeitsmodell im molaren Bereich,1 shows a cross section through a working model in the molar range,

[0012] Fig.2 den Querschnitt nach Fig.1 mit einer aufgeschrumpften Tiefziehfolie,2 shows the cross section according to FIG. 1 with a shrunk-on thermoforming foil,

[0013] Fig.3 den Querschnitt nach Fig.2 ohne den die Prothese bildenden Teil.3 shows the cross section according to Figure 2 without the part forming the prosthesis.

[0014] Zur Herstellung einer Vollprothese mit 16 Zähnen wird in konventioneller Weise ein Arbeitsmodell 1 hergestellt, indem aus Gips die Grundplatte 2 des Arbeitsmodells 1 geformt wird, die die Struktur des Kiefers des Patienten widerspiegelt. Im gezeigten Fall wurde der Patient mit vier Implantaten versehen. Der Aufbau eines Implantats ist mit Bezugszeichen 4 angedeutet. Auf dieser Grundplatte 2 wird mittels Modellwachs und Konfektionzähnen der Teil 3 aufgebaut, der in seiner Raumform der herzustellenden Prothese entspricht. Diese Technik ist dem Fachmann bekannt. Als Ergebnis wird das in Fig.1 gezeigte Arbeitsmodell erzielt. Es zeigt einen Querschnitt im molaren Bereich.For the preparation of a full denture with 16 teeth a working model 1 is prepared in a conventional manner by gypsum base plate 2 of the working model 1 is formed, which reflects the structure of the jaw of the patient. In the case shown, the patient was provided with four implants. The structure of an implant is indicated by reference numeral 4. On this base plate 2, the part 3 is constructed by means of model wax and confection teeth, which corresponds in its spatial shape of the prosthesis to be produced. This technique is known to those skilled in the art. As a result, the working model shown in Fig. 1 is achieved. It shows a cross section in the molar range.

[0015] Bis zu diesem Zeitpunkt gibt es im Arbeitsablauf keinen Unterschied zum Stand der Technik. Es ist daher für die Erfindung irrelevant, auf weiche Weise das Arbeitsmodell 1 hergestellt wurde.Up to this time there is no difference in the workflow to the prior art. It is therefore irrelevant to the invention, in a soft way, the working model 1 was prepared.

[0016] Die vorliegende Erfindung setzt ein, indem, wie in Fig.2 gezeigt, auf das Arbeitsmodell eine Tiefziehfolie 5 aufgeschrumpft wird. Die Tiefziehfolie 5 wird zusammen mit dem Teil 3 von der Grundplatte 2 entfernt. Durch leichtes Erwärmen mit einem Fön wird anschließend die Tiefziehfolie 5 vom Teil 3 getrennt und wieder auf die Grundplatte 2 aufgesetzt. Dadurch ergibt sich, wie in Fig.3 gezeigt, ein Hohlraum 6, der ebenfalls in seiner Raumform der herzustellenden Prothese entspricht.The present invention begins by, as shown in Figure 2, on the working model a thermoforming sheet 5 is shrunk. The thermoforming sheet 5 is removed together with the part 3 of the base plate 2. By gently heating with a hair dryer then the thermoforming sheet 5 is separated from part 3 and placed back on the base plate 2. This results, as shown in Figure 3, a cavity 6, which also corresponds in its spatial shape of the prosthesis to be produced.

[0017] Der nächste Schritt im erfindungsgemäßen Verfahren besteht darin, dass das Gebilde, wie es in Fig.3 gezeigt ist, gedreht nach unten in eine WOL-CERAM®One -Maschine für die elektrophoretische Herstellung von Zähnen eingespannt wird. Vorher wird noch die Grundplatte 2 mit einem üblichen Trennmittel und einem Silberlack beschichtet. Es ist auch empfehlenswert, die Innenseite der Tiefziehfolie 5 mit einem Silberlack zu versehen, falls nicht ohnehin eine leitfähige Schicht auf der Tiefziehfolie vorhanden ist. Diese leitfähige Schicht kann auch durch Benetzen der Folienoberfläche mit der Suspensionsflüssigkeit des Schlickers erzielt werden. Ferner wurden in die Tiefziehfolie 5 im Bereich der Zahnspitzen noch mehrere kleine Öffnungen 7 angebracht, die den Eintritt des Schlickers bei der Elektrophorese und den Austritt der Luft erleichtern.The next step in the method according to the invention is that the structure, as shown in Figure 3, is rotated down in a WOL-CERAM®One machine for the electrophoretic production of teeth clamped. Before the base plate 2 is coated with a conventional release agent and a silver paint. It is also recommended to provide the inside of thermoforming sheet 5 with a silver paint, if not anyway a conductive layer on the thermoforming sheet is present. This conductive layer can also be achieved by wetting the film surface with the slurry slurry slurry. Furthermore, several small openings 7 were placed in the thermoforming sheet 5 in the region of the tooth tips, which facilitate the entry of the slip in the electrophoresis and the exit of the air.

[0018] Das Gebilde gemäß Fig.3 wird in einen üblichen Alumina-Schlicker getaucht, wobei die Stromzufuhr zu der Silberlackschicht über einen nicht gezeigten Zinkstreifen erfolgt. Bei einer Stromstärke von 80 mA füllt sich der Raum 6 innerhalb von 8 min mit Alumina. Der so entstandene Grünkörper ist wegen des Trennmittels leicht von der Grundplatte 2 abhebbar und von der Tiefziehfolie leicht durch Erwärmen zu trennen. Nach geringfügigen Säuberungsarbeiten wird der Alumina-Grünkörper bei 1150 0C gesintert.The structure of Figure 3 is immersed in a conventional alumina slurry, wherein the power supply to the silver paint layer via a zinc strip, not shown, takes place. At a current of 80 mA, the space 6 fills with alumina within 8 minutes. The resulting green body is easy to lift off from the base plate 2 because of the release agent and easily separated from the thermoforming sheet by heating. After minor cleaning work, the alumina green body is sintered at 1150 ° C.

[0019] Die so entstandene Roh-Prothese wird anschließend nach ästhetischen Gesichtspunkten durch Auftragen von Farbe bearbeitet, indem beispielsweise der Zahnfleischbereich rötlich eingefärbt wird und den Zähnen ein mehr natürliches Aussehen gegeben wird. Danach erfolgt die bei Alumina übliche Glasinfiltration. Das Ergebnis ist eine rundherum zufrieden stellende Vollprothese.The resulting raw prosthesis is then processed by aesthetic considerations by applying paint, for example, by the gum area is colored reddish and the teeth is given a more natural look. Thereafter, the usual in Alumina glass infiltration. The result is a completely satisfactory full denture.

[0020] Es versteht sich von selbst, dass das erfindungsgemäße Verfahren nicht auf das vorstehende Beispiel beschränkt ist.It goes without saying that the inventive method is not limited to the above example.

[0021] Anstelle von Alumina ist jedes andere geeignete Keramikmaterial einsetzbar, insbesondere Zirconia. Metalle sind bei größeren Arbeiten aus Gewichtsgründen weniger geeignet. Auch lässt sich Kunststoff unter bestimmten Bedingungen elektrophoretisch abscheiden.Instead of alumina, any other suitable ceramic material can be used, in particular zirconia. Metals are less suitable for larger jobs for weight reasons. In addition, plastic can be electrophoretically deposited under certain conditions.

[0022] Das Arbeitsmodell kann außer einem Modell mit Konfektionszähnen auch eine kompatible Prothese, ein modelliertes Modell oder ein Situationsmodell sein.The working model may be a compatible prosthesis, modeled model or situation model besides a model with fixed teeth.

[0023] Zur Herstellung des Hohlraumes 6 bedarf es nicht unbedingt einer Tiefziehfolie.For the preparation of the cavity 6, it is not necessary necessarily a thermoforming sheet.

[0024] Jeder abformfähiger Kunststoff, wie die bekannten Silikonkunststoffe, ist offensichtlich geeignet. Wesentlich ist nur, dass die Feinstrukturen fehlerfrei abgebildet werden. Any moldable plastic, such as the known silicone plastics, is obviously suitable. It is only important that the fine structures are reproduced without errors.

Claims

Ansprüche claims 1. Verfahren zur Herstellung dentaler Prothesen durch Elektrophorese, dadurch gekennzeichnet, dass ein abformfähiges Material auf ein Arbeitsmodell (1) aufgebracht wird, der zwischen dem Material (5) und der Grundplatte (2) des Arbeitsmodells (1) liegende Teil (3) des Arbeitsmodells (1), der raumformmäßig der gewünschten Prothese entspricht, entfernt wird, wodurch ein Hohlraum (6) entsteht, der durch Elektrophorese ausgefüllt wird.1. A method for producing dental prostheses by electrophoresis, characterized in that an abformfähiges material on a working model (1) is applied, the between the material (5) and the base plate (2) of the working model (1) lying part (3) of the Working model (1), which corresponds in shape to the desired prosthesis, is removed, whereby a cavity (6) is formed, which is filled by electrophoresis. 2. Verfahren nach Anspruch 1 , gekennzeichnet durch die Verwendung von Keramik als Material für die Prothese.2. The method according to claim 1, characterized by the use of ceramic as a material for the prosthesis. 3. Verfahren nach Anspruch 2, gekennzeichnet durch die Verwendung von Alumina.3. The method according to claim 2, characterized by the use of alumina. 4. Verfahren nach einem der Ansprüche 1 bis 3, gekennzeichnet durch die Verwendung einer Tiefziehfolie ( 5) als abformfähiges Material.4. The method according to any one of claims 1 to 3, characterized by the use of a thermoforming sheet (5) as Abformfähiges material. 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Tiefziehfolie (5) eine leitende Schicht aufweist.5. The method according to claim 4, characterized in that the thermoforming sheet (5) has a conductive layer. 6. Verfahren nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass die Tiefziehfolie (5) mit Öffnungen (7) versehen wird. 6. The method according to any one of claims 4 or 5, characterized in that the thermoforming sheet (5) is provided with openings (7).
PCT/EP2009/053882 2008-04-11 2009-04-01 Process for producing dental prostheses by electrophoresis Ceased WO2009124869A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008018434.9 2008-04-11
DE102008018434A DE102008018434A1 (en) 2008-04-11 2008-04-11 Process for the preparation of dental prostheses by electrophoresis

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017005905A1 (en) * 2015-07-08 2017-01-12 Heraeus Kulzer Gmbh Device and method for holding prosthetic teeth

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005570A1 (en) * 1990-02-22 1991-08-29 Schuetz Dental Gmbh Producing artificial teeth - by making suitable positive mould forming transparent negative mould, filling with photopolymerising polymer and curing it
WO2002076321A2 (en) * 2001-03-26 2002-10-03 Wieland Dental + Technik Gmbh & Co. Kg Method for producing all-ceramic dental shaped parts
JP2005325058A (en) * 2004-05-14 2005-11-24 Tokuyama Corp Method for producing ceramic dental restoration
JP2007244803A (en) * 2006-03-20 2007-09-27 National Institute For Materials Science Ceramic dental restoration and method for producing the same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19801532C2 (en) * 1998-01-16 2003-04-30 Stefan Wolz Method and device for thermoforming foils on individual dies in dental technology
DE10021437C2 (en) * 2000-05-03 2002-05-08 Stefan Wolz Process for the production of all-ceramic frameworks, in particular from alumina, in dental technology

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005570A1 (en) * 1990-02-22 1991-08-29 Schuetz Dental Gmbh Producing artificial teeth - by making suitable positive mould forming transparent negative mould, filling with photopolymerising polymer and curing it
WO2002076321A2 (en) * 2001-03-26 2002-10-03 Wieland Dental + Technik Gmbh & Co. Kg Method for producing all-ceramic dental shaped parts
JP2005325058A (en) * 2004-05-14 2005-11-24 Tokuyama Corp Method for producing ceramic dental restoration
JP2007244803A (en) * 2006-03-20 2007-09-27 National Institute For Materials Science Ceramic dental restoration and method for producing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017005905A1 (en) * 2015-07-08 2017-01-12 Heraeus Kulzer Gmbh Device and method for holding prosthetic teeth

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