EP0920297B1 - Melange de revetement pour la coulee de modeles en dentisterie, utilisation dudit melange, et procede de production d'un melange de revetement - Google Patents

Melange de revetement pour la coulee de modeles en dentisterie, utilisation dudit melange, et procede de production d'un melange de revetement Download PDF

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Publication number
EP0920297B1
EP0920297B1 EP97937463A EP97937463A EP0920297B1 EP 0920297 B1 EP0920297 B1 EP 0920297B1 EP 97937463 A EP97937463 A EP 97937463A EP 97937463 A EP97937463 A EP 97937463A EP 0920297 B1 EP0920297 B1 EP 0920297B1
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EP
European Patent Office
Prior art keywords
investment
investment compound
compound
binder
weight
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.)
Expired - Lifetime
Application number
EP97937463A
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German (de)
English (en)
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EP0920297A1 (fr
Inventor
Helmut Hero
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Individual
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Individual
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds

Definitions

  • the invention relates to an investment for model casting technology in dental technology, consisting of sand and binder, the binder being monoammonium phosphate (MAP) and Contains magnesium oxide (MGO). It also relates to the use of the investment and a method for producing such an investment.
  • MAP monoammonium phosphate
  • MGO magnesium oxide
  • model casting work is modeled on an investment model, with Investing material overbed and preheated to high temperatures between 900 ° C and 1050 ° C and then poured.
  • the preheating process is as follows: The with Investment overlayed work ("model casting muffle") is placed in the cold oven and linear (with a normal heating temperature of 2 to 9 ° C / min) to the final temperature heated up.
  • the final temperature in the model casting technique must be above 900 ° C Usually temperatures of up to 1050 ° C and possibly even higher temperatures can be achieved. This depends on the respective cobalt-chrome-molybdenum model casting alloys, which are used in model casting technology
  • the final temperature the preheating phase should be 400 to 450 ° C below the for metallurgical reasons Melting point of the respective model casting alloy.
  • the muffle cools in the
  • the muffle is preheated to 600 ° C Given oven, preheated at this temperature for about 30 min and then linear to a Final temperature of 900 ° C and higher heated up after a corresponding final holding time of The muffle can then be cast for approx. 40 to 60 minutes due to the higher initial temperature and a shorter linear heating certain time savings.
  • sand quartz and cristobalite
  • MGO magnesium oxide
  • the object of the invention is therefore to provide an investment for the model casting technique in the Dental technology and a method of creating an investment that create it enable the model casting muffle without using the investment material preheating directly in the oven preheated to final temperature (900 to 1050 ° C) to give, without causing damage to the model casting muffle.
  • a further development of the invention is that the weight proportion of the binder on the Total mass of the investment is more than 20%.
  • the weight proportion of the binder in the total mass is between 20% and 35%.
  • the muffle is preheated to 600 ° C Given oven, preheated at this temperature for about 30 min and then linear to a Final temperature of 900 ° C and higher heated. After a corresponding final holding time of The muffle can then be cast for approx. 40 to 60 min. With this method you get due to the higher initial temperature and a shorter linear heating certain time savings.
  • sand quartz and cristobalite
  • Binder mainly exists in so-called phosphate-bonded investment materials from monoammonium phosphate (MAP) and from magnesium oxide (MGO).
  • MAP monoammonium phosphate
  • MGO magnesium oxide
  • the sand content is approx. 80 to 85% by weight and the binder content is approx. 15 up to 20% by weight.
  • the MAP portion within the binder is often around 2 to 3% above the MGO share, but sometimes the two shares are approximately the same.
  • a refractory tooth model material is known from FR 1 623 187 A1, which consists of 5 to 20% a soluble phosphate, 5 to 20% magnesium oxide and 10 to 50% at least one Element from the group of aluminum oxide, zirconium oxide, sintered quartz, mullite, spinel and Cordierite.
  • DE 37 40 883 A1 describes a dental casting embedding compound for the production of metallic dentures such as crowns, inlays and bridges made from a mixture at least one refractory material selected from aluminum oxide, zirconium oxide, Magnesium oxide clinker, quartz, crystallobalite and sintered quartz with either a mixture of soluble phosphate with magnesium oxide or gypsum hemihydrate as a binder as well Raw starch and at least one compound from the group of powdered carbides, Nitrides, borides, silicides and sulfides of the transition metals of groups IV, V and VI des Periodic table and optionally soluble starch are added as blowing agents, consists.
  • This composition is chosen to provide adequate thermal expansion to reach the crowd.
  • the object of the invention is therefore to provide an investment for the model casting technique in the Dental technology and a method of creating an investment that create it enable the model casting muffle without using the investment material preheating directly in the oven preheated to final temperature (900 to 1050 ° C) to give, without causing damage to the model casting muffle.
  • a further development of the invention is that the weight proportion of the binder on the Total mass of the investment is more than 20%.
  • the weight proportion of the binder in the total mass is between 20% and 35%.
  • This information relates to sand mixtures in which approx. 8 to 12% by weight is finer Sand (fine quartz powder or fine cristobalite with a grain size d50% of less than 20 ⁇ m is present and the rest consists of coarse sand.
  • finer Sand fine quartz powder or fine cristobalite with a grain size d50% of less than 20 ⁇ m is present and the rest consists of coarse sand.
  • the weight fraction of MAP in the total mass must be more than 3.5% higher than that of MGO.
  • This recipe contains a relatively high proportion (approx. 70%) of coarse sand (quartz sand F34 and quartz powder W3) and only 9.5% fine sand (Cristobalit M0010) So here is enough MAP share that is 3.5% above the MGO share, so that this recipe Can withstand a temperature shock of approx. 1050 ° C.
  • the MAP content slightly increased (e.g. to 12.3%) or the MGO share slightly decreased (e.g. to 8.2%) in order to ensure that when the model casting muffle is placed in the furnace the Temperature shock is endured
  • the weight proportion of the binder at 20.5% of the total mass
  • This recipe has a higher proportion of fine sands than in Example 1, namely 33.7% W6 (quartz flour) and 15% SF3000 (very fine cristobalite).

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Dental Prosthetics (AREA)
  • Dental Preparations (AREA)
  • Mold Materials And Core Materials (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Claims (8)

  1. Revêtement pour la coulée de modèle en dentisterie, composé de sable et d'un liant contenant du phosphate d'ammonium diacide (MAP) et de l'oxyde de magnésium (MGO), caractérisé en ce que la fraction pondérale du phosphate d'ammonium diacide (MAP) dans la masse totale du revêtement est supérieure d'au moins 3,5 % à la fraction pondérale de l'oxyde de magnésium (MGO).
  2. Revêtement selon la revendication 1, caractérisé en ce que la fraction pondérale du liant dans la masse totale du revêtement est supérieure à 20 %.
  3. Revêtement selon la revendication 1, caractérisé en ce que la fraction pondérale du liant dans la masse totale est comprise entre 20 % et 35 %.
  4. Utilisation du revêtement selon les revendications 1 à 3 dans un procédé de coulée de modèle pour la dentisterie, caractérisée par les étapes de procédé suivantes :
    modelage de la maquette sur un modèle en revêtement, un revêtement selon les revendications 1 à 3 étant utilisé,
    enrobage de la maquette avec un revêtement selon les revendications 1 à 3,
    introduction du moufle de coulée de modèle dans four préchauffé à une température supérieure à environ 900 °C,
    remplissage par coulée du moufle de coulée de modèle après environ une heure.
  5. Utilisation du revêtement selon les revendications 1 à 3 dans un procédé de coulée de modèle pour la dentisterie, caractérisée par les étapes de procédé suivantes :
    modelage de la maquette avec de la cire ou une matière plastique sur le modèle maítre,
    démoulage et fixation à l'aide de tiges de coulée de la maquette sur un socle de moufle entouré d'un cylindre,
    enrobage de la maquette avec du revêtement selon les revendications 1 à 3,
    introduction du moufle de coulée de modèle dans un four préchauffé à une température supérieure à environ 900 °C,
    remplissage par coulée du moufle de coulée de modèle après environ une heure.
  6. Utilisation selon la revendication 4 ou la revendication 5, caractérisée en ce que la température du four lors de l'introduction du moufle de coulée de modèle est comprise entre 900 °C et 1 050 °C.
  7. Procédé de fabrication d'un revêtement pour la coulée de modèles en dentisterie, qui rende possible l'introduction du moufle de coulée de modèle fabriqué avec ce revêtement dans un four préchauffé à une température supérieure à 900 °C, un liant étant mélangé principalement à base de phosphate d'ammonium diacide (MAP) et d'oxyde de magnésium (MGO), la fraction pondérale du phosphate d'ammonium diacide (MAP) dans la masse totale de revêtement étant supérieure d'au moins 3,5 % à la fraction pondérale de l'oxyde de magnésium (MGO) et ce liant étant mélangé à du sable.
  8. Procédé selon la revendication 7, caractérisé en ce que le sable se compose de quartz et de cristobalite.
EP97937463A 1996-09-02 1997-09-02 Melange de revetement pour la coulee de modeles en dentisterie, utilisation dudit melange, et procede de production d'un melange de revetement Expired - Lifetime EP0920297B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19635842 1996-09-02
DE19635842 1996-09-02
PCT/DE1997/001899 WO1998009604A1 (fr) 1996-09-02 1997-09-02 Melange de revetement pour la coulee de modeles en dentisterie, utilisation dudit melange, et procede de production d'un melange de revetement

Publications (2)

Publication Number Publication Date
EP0920297A1 EP0920297A1 (fr) 1999-06-09
EP0920297B1 true EP0920297B1 (fr) 2000-07-12

Family

ID=7804580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97937463A Expired - Lifetime EP0920297B1 (fr) 1996-09-02 1997-09-02 Melange de revetement pour la coulee de modeles en dentisterie, utilisation dudit melange, et procede de production d'un melange de revetement

Country Status (5)

Country Link
EP (1) EP0920297B1 (fr)
AT (1) ATE194487T1 (fr)
AU (1) AU4009297A (fr)
DE (1) DE59702020D1 (fr)
WO (1) WO1998009604A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63141906A (ja) 1986-12-03 1988-06-14 G C Dental Ind Corp 歯科鋳造用埋没材
JPH0637376B2 (ja) 1987-11-18 1994-05-18 而至歯科工業株式会社 歯科用耐火模型材

Also Published As

Publication number Publication date
DE59702020D1 (de) 2000-08-17
WO1998009604A1 (fr) 1998-03-12
ATE194487T1 (de) 2000-07-15
EP0920297A1 (fr) 1999-06-09
AU4009297A (en) 1998-03-26

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