EP1438000A1 - System for producing a veneering ceramic - Google Patents

System for producing a veneering ceramic

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Publication number
EP1438000A1
EP1438000A1 EP02785298A EP02785298A EP1438000A1 EP 1438000 A1 EP1438000 A1 EP 1438000A1 EP 02785298 A EP02785298 A EP 02785298A EP 02785298 A EP02785298 A EP 02785298A EP 1438000 A1 EP1438000 A1 EP 1438000A1
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EP
European Patent Office
Prior art keywords
mol
mixture
ceramic
oxide
veneering
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.)
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Application number
EP02785298A
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German (de)
French (fr)
Inventor
Norbert Thiel
Markus Vollmann
Marc Stephan
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.)
Vita Zahnfabrik H Rauter GmbH and Co KG
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Vita Zahnfabrik H Rauter GmbH and Co KG
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Publication of EP1438000A1 publication Critical patent/EP1438000A1/en
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/802—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics
    • A61K6/807—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics comprising magnesium oxide
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/20—Protective coatings for natural or artificial teeth, e.g. sealings, dye coatings or varnish
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/802—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics
    • A61K6/818—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics comprising zirconium oxide
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/802—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics
    • A61K6/822—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics comprising rare earth metal oxides
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/802—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics
    • A61K6/824—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics comprising transition metal oxides

Definitions

  • the present invention relates to a system for producing a veneering ceramic using three mixtures.
  • Partially stabilized zirconium oxide (TZP: Tetragonal Zirconia Polycrystals) for medical and dental applications is state of the art.
  • Hip joint balls are made from yttrium-stabilized zirconium oxide (Y-TZP) (St. Gobain - Desmarquest) and dental frameworks from Y-TZP from DCS, Degussa.
  • Y-TZP yttrium-stabilized zirconium oxide
  • DCS Degussa.
  • These ceramics of the TZP type consist of the tetragonal phase of the ZrO 2 - Y 2 O 3 system (R ⁇ mpp-Lexikon Chemie, 10th edition).
  • these zirconium oxide frameworks will be veneered with a ceramic material at temperatures from 650 ° C to 1000 ° C. This leads to defects in the veneering ceramics directly after veneering or only after a few hours or days (so-called late jumps).
  • the invention is based on the technical problem of preventing these late cracks in the veneering ceramic and thus drastically increasing the service life of the all-ceramic overall system consisting of the all-ceramic framework and the suitable veneering ceramic.
  • a system for producing an all-ceramic dental prosthesis based on a core material made of TZP (Tetragonal Zirconia Polycrystals) as a starting material comprising an intermediate layer obtainable from a mixture A, a mixture B for a veneering ceramic
  • the dentures produced are regularly infiltrated, which is necessary in order to give the dentures the necessary strength.
  • CeO 2 used in particular, in which this mixture is applied to the porous sintered core material.
  • the infiltration glasses contain, as is known to the person skilled in the art, lanthanum oxides.
  • the infiltration technique is used in the manufacture of dentures in accordance with the Inceram method from VITA Zahnfabrik GmbH, which is known to the experts.
  • the porous sintered oxide ceramic core materials made of TZP preferably have a porosity of 1-40 vol%.
  • the porosity is determined in a simple manner by means of a density determination known per se to the person skilled in the art. The procedure for determining the density is explained in more detail in Example 3.
  • the system according to the invention has either cerium or yttrium oxide as an essential component. Additional zircon-stabilizing oxides can be added. These are in particular magnesium oxide, calcium oxide and / or lanthanum oxide.
  • the invention also relates to the use of mixtures A, B and / or C according to the invention.
  • the system according to the invention therefore provides options for using densely sintered or porous sintered TZP core materials for a denture.
  • mixture B can be used to apply the veneer directly to the core material and, after firing, a corresponding denture can be obtained.
  • an intermediate layer which consists of the mixture A according to the system according to the invention, is preferably applied between the core material and the facing.
  • the invention therefore also relates to an all-ceramic dental prosthesis based on a dense or porous sintered core material made of TZP as the starting material, optionally an intermediate layer A obtainable by applying mixture A according to the system of the invention, a veneering ceramic B obtainable by applying the mixture B according to the system of the present invention and an all-ceramic dental prosthesis based on a porous sintered core material based on TZP, which is solidified by infiltration by applying mixture C according to the invention to infiltrate the porous sintered material.
  • Example 1 Veneering of a dense zirconium oxide framework (e.g. anterior tooth cap) with a suitable veneering ceramic.
  • a so-called bonder is applied to the thermally pretreated zirconium oxide framework (Y-TZP), consisting of the veneering material with an additional 3 mol% Y 2 O 3 content.
  • Y-TZP thermally pretreated zirconium oxide framework
  • the layering over the veneer is completed with the veneer and the usual layer structure (opaque dentin, dentin; enamel).
  • the composition of the bonder is as follows:
  • the veneering material can also directly contain proportions of Y 2 O 3 (e.g. 3 mol%)
  • Example 2 A zirconium dioxide / aluminum oxide mixture with a composition of approx. 30% by weight of ZrO 2 and 70% by weight of Al 2 O 3 with an average grain size of 3 ⁇ m is produced.
  • the zirconium dioxide used is stabilized with a proportion between 15 and 16% by weight of cerium dioxide.
  • the mixture is shaped and sintered at a temperature of 1180 ° C.
  • the resulting porous sintering structure is infiltrated at 1140 ° C with a lanthanum glass according to the "Inceram technique".
  • a glass of the following composition is used:
  • the resulting work has a fracture toughness (SEVNB method) of 4.5 MPa m and a breaking strength of 600 MPa.
  • Temperature change resistance tests show a drastically improved survival rate for veneered anterior caps and three-unit bridges compared to veneered crowns and bridges that were infiltrated with an infiltration glass as stated above, but without the addition of 4% by weight Y 2 O 3
  • thermal shock resistance tests of veneered crowns and bridges that were glass-filtered with a 40 ° C higher infiltration temperature (1180 ° C) also showed a significant increase in survival compared to materials infiltrated with conventional infiltration glasses. This leads to a significant improvement in the process robustness of the production of the all-ceramic system, since the dental furnaces used in the market frequently exceed the desired peak temperature when leveling off to this peak temperature in the required rapid firing programs.
  • Example 3 The porosity of a porous sintered core material according to Example 2 is determined using the following method:
  • Test pieces of simple geometry e.g. cubes or cuboids
  • the surfaces are ground flat. Length, width and height are measured with a caliper and the volume of the body is calculated from this.
  • the mass of the dry test specimens is then determined.
  • the density porous results from the quotient mass / volume of the respective test specimen. Usually, averaging over 10 measured values is then carried out.
  • the porosity of the sintered core material in percent then results from the equation

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Plastic & Reconstructive Surgery (AREA)
  • Inorganic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dental Preparations (AREA)
  • Dental Prosthetics (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The invention relates to a system for producing a fully ceramic artificial dentition based on a core material consisting of TZP (tetragonal zirconia polycrystals) as a starting material, an intermediate layer which can be obtained from a mixture A, and a mixture B for a veneering ceramic comprising: (a) a mixture A containing, in addition to aluminosilicates, between 0.5 and 8 mol %, especially between 2 and 5 mol % of yttrium oxide, preferably Y2O3, and/or between 8 and 16 mol %, especially between 10 and 14 mol % of ceroxide, especially CeO2; and/or (b) a mixture B containing a veneering ceramic for veneering fully ceramic substructures consisting of TZP, and also containing between 0.5 and 8 mol %, especially between 2 and 5 mol % of yttrium oxide, especially Y2O3, and/or between 8 and 16 mol %, preferably between 10 and 14 mol % of ceroxide, especially CeO2.

Description

System zur Herstellung einer Verblendkeramik System for the production of veneering ceramics
Die vorliegende Erfindung betrifft ein System zur Herstellung einer Verblendkeramik unter Verwendung von drei Mischungen.The present invention relates to a system for producing a veneering ceramic using three mixtures.
Teilstabilisiertes Zirkoniumoxid (TZP: Tetragonal Zirconia Polycrystals) für medizinische und dentale Anwendungen ist Stand der Technik. So werden Hüftgelenkskugeln aus yttriumstabilisierten Zirkoniumoxid (Y-TZP) hergestellt (St. Gobain - Desmarquest) und dentale Gerüste aus Y-TZP von der Firma DCS, Degussa. Diese Keramiken vom TZP-Typ bestehen aus der tetragonalen Phase des ZrO2 - Y2O3 Systems (RÖmpp-Lexikon Chemie, 10. Auflage).Partially stabilized zirconium oxide (TZP: Tetragonal Zirconia Polycrystals) for medical and dental applications is state of the art. Hip joint balls are made from yttrium-stabilized zirconium oxide (Y-TZP) (St. Gobain - Desmarquest) and dental frameworks from Y-TZP from DCS, Degussa. These ceramics of the TZP type consist of the tetragonal phase of the ZrO 2 - Y 2 O 3 system (RÖmpp-Lexikon Chemie, 10th edition).
Diese Zirkoniumoxid-Gerüste werden aus ästhetischen Gesichtspunkten mit einer keramischen Masse bei Temperaturen von 650°C bis 1000°C verblendet werden. Hierbei kommt es immer wieder zu Defekten in der Verblendkeramik direkt nach dem Verblenden oder erst nach einigen Stunden bzw. Tagen (sogenannte Spätsprünge).From an aesthetic point of view, these zirconium oxide frameworks will be veneered with a ceramic material at temperatures from 650 ° C to 1000 ° C. This leads to defects in the veneering ceramics directly after veneering or only after a few hours or days (so-called late jumps).
Der Erfindung zu Grunde liegt das technische Problem zu Grunde diese Spätsprünge in der Verblendkeramik zu unterbinden und somit die Lebensdauer des vollkeramischen Gesamtsystems bestehend aus dem vollkeramischen Gerüst und der dazu geeigneten Verblendkeramik drastisch zu erhöhen.The invention is based on the technical problem of preventing these late cracks in the veneering ceramic and thus drastically increasing the service life of the all-ceramic overall system consisting of the all-ceramic framework and the suitable veneering ceramic.
Gemäß der Erfindung wird das Problem gelöst durch ein System zur Herstel- lung eines vollkeramischen Zahnersatzes auf Basis eines Kernmaterials aus TZP (Tetragonal Zirconia Polycrystals) als Ausgangsmaterial, einer Zwischenschicht erhältlich aus einer Mischung A, einer Mischung B für eine Verblendkeramik umfassendAccording to the invention, the problem is solved by a system for producing an all-ceramic dental prosthesis based on a core material made of TZP (Tetragonal Zirconia Polycrystals) as a starting material, comprising an intermediate layer obtainable from a mixture A, a mixture B for a veneering ceramic
• (a) eine Mischung A enthaltend neben Aluminosilikaten 0,5 - 8 mol %, insbesondere 2 - 5 mol % Yttriumoxid, vorzugsweise Y2O3, und/oder 8 - 16 mol %, insbesondere 10 - 14 mol % Ceroxid, insbesondere CeO2, und/oder(A) a mixture A comprising 0.5-8 mol%, in particular 2-5 mol%, of yttrium oxide, preferably Y 2 O 3 , in addition to aluminosilicates, and / or 8-16 mol%, in particular 10-14 mol%, of cerium oxide, in particular CeO 2 , and / or
• (b) eine Mischung B enthaltend eine Verblendkeramik zur Ver- blendung von vollkeramischen Gerüsten aus TZP, wobei die Mischung 0,5 - 8 mol %, insbesondere 2 - 5 mol % Yttriumoxid, insbesondere Y2O3, und/oder 8 - 16 mol %, vorzugsweise 10 - 14 mol % Ceroxid, insbesondere CeO2, enthält.• (b) a mixture B containing a veneering ceramic for veneering all-ceramic frameworks made of TZP, the mixture 0.5-8 mol%, in particular 2-5 mol%, yttrium oxide, in particular Y 2 O 3 , and / or 8- 16 mol%, preferably 10-14 mol% cerium oxide, in particular CeO 2 , contains.
Für den Fall, dass das Kernmaterial nicht dicht gesintertes TZP ist, erfolgt regelmäßig eine Infiltration des hergestellten Zahnersatzes welche nötig ist, um dem Zahnersatz die notwendige Festigkeit zu verleihen. Zur Infiltration wird erfindungsgemäß eine Mischung eines Infiltrationsglases zur Infiltration von porösen oxidkeramischen Gerüsten mit einem Gehalt von 1 - 8 mol % Yttriu- moxid, insbesondere Y2O3, und/oder 8 - 16 mol %, insbesondere 10 - 14 mol % Ceroxid, insbesondere CeO2 eingesetzt, in dem diese Mischung auf das porös gesinterte Kernmaterial aufgebracht wird. Die Infiltrationsgläser enthalten wie dem Fachmann bekannt ist Lanthanoxide. Die Infiltrationstechnik wird bei Herstellung der Zahnersatze gemäß der den Fachleuten bekannten Inceram- Methode der Firma VITA Zahnfabrik GmbH eingesetzt. Die porös gesinterten oxidkeramischen Kernmaterialien aus TZP weisen vorzugsweise eine Porosität von 1 - 40 Vol % auf. Die Porosität wird in einfacher Weise über eine dem Fachmann an sich bekannte Dichtebestimmung ermittelt. Die Durchführung der Dichtebestimmung wird in Beispiel 3 näher erläutert.In the event that the core material is not densely sintered TZP, the dentures produced are regularly infiltrated, which is necessary in order to give the dentures the necessary strength. According to the invention, a mixture of an infiltration glass for infiltration of porous oxide-ceramic frameworks with a content of 1-8 mol% yttrium oxide, in particular Y 2 O 3 , and / or 8-16 mol%, in particular 10-14 mol% cerium oxide, is used for the infiltration. CeO 2 used in particular, in which this mixture is applied to the porous sintered core material. The infiltration glasses contain, as is known to the person skilled in the art, lanthanum oxides. The infiltration technique is used in the manufacture of dentures in accordance with the Inceram method from VITA Zahnfabrik GmbH, which is known to the experts. The porous sintered oxide ceramic core materials made of TZP preferably have a porosity of 1-40 vol%. The porosity is determined in a simple manner by means of a density determination known per se to the person skilled in the art. The procedure for determining the density is explained in more detail in Example 3.
Das erfindungsgemäße System weist entweder Cer- oder Yttriumoxid als essentiellen Bestandteil auf. Weitere zirkonstabilisierende Oxide können beigemischt sein. Dabei handelt es sich insbesondere um Magnesiumoxid, Kalziumoxid und/oder Lanthanoxid. Gegenstand der Erfindung ist auch die Verwen- düng der Mischungen A, B und/oder C gemäß der Erfindung. Das erfindungsgemäße System stellt mithin Möglichkeiten zur Verfügung dicht gesinterte oder porös gesinterte Kernmaterialien aus TZP für einen Zahnersatz einzusetzen.The system according to the invention has either cerium or yttrium oxide as an essential component. Additional zircon-stabilizing oxides can be added. These are in particular magnesium oxide, calcium oxide and / or lanthanum oxide. The invention also relates to the use of mixtures A, B and / or C according to the invention. The system according to the invention therefore provides options for using densely sintered or porous sintered TZP core materials for a denture.
Im Falle der dicht gesinterten Kernmaterialien kann mittels der Mischung B die Verblendung direkt auf das Kernmaterial aufgetragen werden und nach Brennen ein entsprechender Zahnersatz erhalten werden. Vorzugsweise wird jedoch zwischen Kernmaterial und Verblendung eine Zwischenschicht (Bonder) aufgetragen, der aus der Mischung A gemäß des erfindungsgemäßen Systems besteht.In the case of densely sintered core materials, mixture B can be used to apply the veneer directly to the core material and, after firing, a corresponding denture can be obtained. However, an intermediate layer (bonder), which consists of the mixture A according to the system according to the invention, is preferably applied between the core material and the facing.
Wird ein porös gesintertes Kernmaterial aus TZP eingesetzt, wird dieses mittels Mischung C nach dem System gemäß der Erfindung infiltriert, so dass sich die Endfestigkeit einstellt. Gegenstand der Erfindung ist mithin auch ein voll- keramischer Zahnersatz auf Basis eines dicht- oder porös gesinterten Kernmaterials aus TZP als Ausgangsmaterial, gegebenenfalls einer Zwischenschicht A erhältlich durch Aufbringen der Mischung A gemäß dem System der Erfindung, einer Verblendkeramik B, erhältlich durch Aufbringung der Mischung B gemäß System der vorliegenden Erfindung sowie einem vollkeramischen Zahnersatz auf Basis eines porös gesinterten Kernmaterials auf Basis von TZP, welcher durch Infiltration durch Aufbringen der Mischung C gemäß der Erfindung zur Infiltration des porös gesinterten Materials verfestigt ist.If a porous sintered core material made of TZP is used, it is infiltrated using mixture C according to the system according to the invention, so that the final strength is achieved. The invention therefore also relates to an all-ceramic dental prosthesis based on a dense or porous sintered core material made of TZP as the starting material, optionally an intermediate layer A obtainable by applying mixture A according to the system of the invention, a veneering ceramic B obtainable by applying the mixture B according to the system of the present invention and an all-ceramic dental prosthesis based on a porous sintered core material based on TZP, which is solidified by infiltration by applying mixture C according to the invention to infiltrate the porous sintered material.
Beispiel 1 : Verblendung eines dichten Zirkoniumoxidgerüstes (z. B. Frontzahnkappe) mit einer dazu geeigneten Verblendkeramik. Dazu wird auf das thermisch vorbehandelte Zirkoniumoxidgerüst (Y-TZP) ein sogenannter Bonder aufgebracht, bestehend aus der Verblendmasse mit zusätzlichem Anteil von 3 mol % Y2O3. Nach diesem Auftrag wird die Schichtung über der Verblendung mit der Ver- blendmasse und dem üblichen Schichtaufbau (Opakdentin, Dentin; Schmelz) vollendet. Die Zusammensetzung des Bonders ist wie folgt:Example 1: Veneering of a dense zirconium oxide framework (e.g. anterior tooth cap) with a suitable veneering ceramic. For this purpose, a so-called bonder is applied to the thermally pretreated zirconium oxide framework (Y-TZP), consisting of the veneering material with an additional 3 mol% Y 2 O 3 content. After this application, the layering over the veneer is completed with the veneer and the usual layer structure (opaque dentin, dentin; enamel). The composition of the bonder is as follows:
AI2O3 6,7 Gew.-%AI 2 O 3 6.7% by weight
SiO2 60,5 Gew.-% K2O 9,0 Gew.-%SiO 2 60.5% by weight K 2 O 9.0% by weight
Na2O 4,0 Gew.-%Na 2 O 4.0% by weight
B2O3 6,0 Gew.-%B 2 O 3 6.0% by weight
Li2O 0,6 Gew.-%Li 2 O 0.6% by weight
CaO 1,5 Gew.-% Y2O3 9,7 Gew.-%CaO 1.5% by weight Y 2 O 3 9.7% by weight
Optional kann auch die Verblendmasse direkt Anteile von Y2O3 enthalten (z. B. 3 mol-%)Optionally, the veneering material can also directly contain proportions of Y 2 O 3 (e.g. 3 mol%)
Beispiel 2 : Ein Zirkoniumdioxid/Aluminiumoxid-Gemisch mit einer Zusammensetzung von ca. 30 Gew.-% ZrO2 und 70 Gew.-% AI2O3 mit einer mittleren Korngröße von 3 μm wird hergestellt. Das verwendete Zirkoniumdioxid ist mit einem Anteil zwischen 15 und 16 Gew.-% Cerdioxid stabilisiert. Das Gemisch wird geformt und bei einer Temperatur von 1180°C gesintert. Das so entstandene poröse Sin- tergerüst wird bei 1140°C mit einem Lanthanglas gemäß "Inceramtechnik" infiltriert. Ein Glas folgender Zusammensetzung wird verwendet:Example 2: A zirconium dioxide / aluminum oxide mixture with a composition of approx. 30% by weight of ZrO 2 and 70% by weight of Al 2 O 3 with an average grain size of 3 μm is produced. The zirconium dioxide used is stabilized with a proportion between 15 and 16% by weight of cerium dioxide. The mixture is shaped and sintered at a temperature of 1180 ° C. The resulting porous sintering structure is infiltrated at 1140 ° C with a lanthanum glass according to the "Inceram technique". A glass of the following composition is used:
La2O3 30,5 Gew.-%La 2 O 3 30.5% by weight
Al2O3 17,4 Gew.-%Al 2 O 3 17.4% by weight
SiO2 16,6 Gew.-%SiO 2 16.6% by weight
B2O3 11,5 Gew.-%B 2 O 3 11.5% by weight
TiO2 2,8 Gew.-%TiO 2 2.8% by weight
ZrO2 2,0 Gew.-%ZrO 2 2.0% by weight
CeO2 8,1 Gew.-%CeO 2 8.1% by weight
Y2O3 4,2 Gew.-%Y 2 O 3 4.2% by weight
CaO 5,8 Gew.-%CaO 5.8% by weight
Rest Farbpigmente Die entstehende Arbeit besitzt eine Bruchzähigkeit (SEVNB-Methode) von 4,5 MPa m und eine Bruchfestigkeit von 600 MPa. Temperaturwechselbeständig- keitsversuche zeigen für verblendete Frontzahnkappen und dreigliedrigen Brücken eine drastisch verbesserte Überlebensrate im Vergleich zu verblendeten Kronen und Brücken, die mit einem Infiltrationsglas wie oben angegeben worden infiltriert worden, jedoch ohne Zusatz von 4 Gew.-% Y2O3 Rest of color pigments The resulting work has a fracture toughness (SEVNB method) of 4.5 MPa m and a breaking strength of 600 MPa. Temperature change resistance tests show a drastically improved survival rate for veneered anterior caps and three-unit bridges compared to veneered crowns and bridges that were infiltrated with an infiltration glass as stated above, but without the addition of 4% by weight Y 2 O 3
Des Weiteren zeigen Temperaturwechselbeständigkeitstests von verblendeten Kronen und Brücken, die mit einer um 40°C erhöhte Infiltrationstemperatur (1180°C) glasfiltriert wurden, ebenso eine signifikante Erhöhung der Überlebensrate im Vergleich zu mit konventionellen Infiltrationsgläsern infiltrierten Materialien. Dies führt zu einer deutlichen Verbesserung der Verfahrensrobust- heit der Herstellung des vollkeramischen Systems, da die im Markt verwende- ten Dentalöfen bei den geforderten Schnellbrennprogrammen die gewünschte Spitzentemperatur beim Einpendeln in diese Spitzentemperatur häufig überschreiten.Furthermore, thermal shock resistance tests of veneered crowns and bridges that were glass-filtered with a 40 ° C higher infiltration temperature (1180 ° C) also showed a significant increase in survival compared to materials infiltrated with conventional infiltration glasses. This leads to a significant improvement in the process robustness of the production of the all-ceramic system, since the dental furnaces used in the market frequently exceed the desired peak temperature when leveling off to this peak temperature in the required rapid firing programs.
Beispiel 3: Die Porosität eines porös gesinterten Kernmaterials gemäß Beispiel 2 wird mittels der folgenden Methode bestimmt:Example 3: The porosity of a porous sintered core material according to Example 2 is determined using the following method:
Aus den porös gesinterten Teilen werden Probekörper einfacher Geometrie (z. B. Würfel oder Quader) mittels einer Diamantdrahtsäge herausgesägt, und die Flächen plan geschliffen. Mit einem Meßschieber werden Länge, Breite und Hö- he gemessen und daraus das Volumen des Körpers berechnet. Nach gründlicher Reinigung mit Ultraschall und Alkohol wird dann die Masse der trockenen Probekörper bestimmt. Die Dichte porös ergibt sich aus dem Quotienten Masse/Volumen des jeweiligen Probekörpers. Üblicherweise wird dann über 10 Messwerte gemittelt. Die Porosität des gesinterten Kernmaterials in Prozent ergibt sich dann nach der GleichungTest pieces of simple geometry (e.g. cubes or cuboids) are sawn out of the porous sintered parts using a diamond wire saw, and the surfaces are ground flat. Length, width and height are measured with a caliper and the volume of the body is calculated from this. After thorough cleaning with ultrasound and alcohol, the mass of the dry test specimens is then determined. The density porous results from the quotient mass / volume of the respective test specimen. Usually, averaging over 10 measured values is then carried out. The porosity of the sintered core material in percent then results from the equation
P = 100 (1 - Dichte porös/Dichte theoretisch), wobei die theoretische Dichte die Dichte des nicht porösen Materials ist. P = 100 (1 - density porous / density theoretical), where the theoretical density is the density of the non-porous material.

Claims

Patentansprüche claims
1. System zur Herstellung eines vollkeramischen Zahnersatzes auf Basis eines Kernmaterials aus TZP (Tetragonal Zirconia Polycrystals) als Ausgangsma- terial, einer Zwischenschicht erhältlich aus einer Mischung A, einer Mischung1. System for producing an all-ceramic denture based on a core material made of TZP (Tetragonal Zirconia Polycrystals) as the starting material, an intermediate layer available from a mixture A, a mixture
B für eine Verblendkeramik umfassendB for a veneering ceramic
• (a) eine Mischung A enthaltend neben Aluminosilikaten 0,5 - 8 mol %, insbesondere 2 - 5 mol % Yttriumoxid, vorzugsweise Y2O3, und/oder 8 - 16 mol %, insbesondere 10 - 14 mol % Ceroxid, insbesondere CeO2, und/oder• (a) a mixture A comprising 0.5 to 8 mol%, in particular 2 to 5 mol% of yttrium oxide, preferably Y 2 O 3 , and / or 8 to 16 mol%, in particular 10 to 14 mol% of cerium oxide, in particular in addition to aluminosilicates CeO 2 , and / or
• (b) eine Mischung B enthaltend eine Verblendkeramik zur Verblendung von vollkeramischen Gerüsten aus TZP, wobei die Mi- schung 0,5 - 8 mol %, insbesondere 2 - 5 mol % Yttriumoxid, insbesondere Y2O3, und/oder 8 - 16 mol %, vorzugsweise 10 - 14 mol % Ceroxid, insbesondere CeO2, enthält.• (b) a mixture B containing a veneering ceramic for veneering all-ceramic frameworks made of TZP, the mixture being 0.5-8 mol%, in particular 2-5 mol%, of yttrium oxide, in particular Y 2 O 3 , and / or 8- 16 mol%, preferably 10-14 mol% cerium oxide, in particular CeO 2 , contains.
2. System zur Herstellung eines vollkeramischen Zahnersatzes auf Basis von porös gesinterten Kernmaterials aus TZP als Ausgangsmaterial, sowie einer2. System for the production of an all-ceramic denture based on porous sintered core material made of TZP as the starting material, as well as one
Infiltrationsschicht, wobei die Infiltrationsschicht aus einer Mischung eines Infiltrationsglases zur Infiltration von porösen oxidkeramischen Gerüsten mit einem Gehalt von 0,5 - 8 mol %, insbesondere 2 - 5 mol % Yttriumoxid, insbesondere Y2O3, und/oder 8 - 16 mol %, insbesondere 10 - 14 mol % Ceroxid, insbesondere CeO2 Infiltration layer, the infiltration layer consisting of a mixture of an infiltration glass for the infiltration of porous oxide-ceramic frameworks with a content of 0.5-8 mol%, in particular 2-5 mol%, yttrium oxide, in particular Y 2 O 3 , and / or 8-16 mol% , in particular 10-14 mol% of cerium oxide, in particular CeO 2
3. System nach Anspruch 2, wobei das poröse oxidkeramische Gerüst eine Porosität von 1 - 40 Vol % aufweist.3. System according to claim 2, wherein the porous oxide ceramic framework has a porosity of 1-40 vol%.
4. System nach mindestens einem der Ansprüche 1 bis 3, wobei an Stelle von Cer- oder Yttriumoxid weitere Zirkonoxidstabilisierende Oxide in der Mischung vorhanden sind. 4. System according to at least one of claims 1 to 3, wherein in place of cerium or yttrium oxide further zirconium oxide-stabilizing oxides are present in the mixture.
5. System nach Anspruch 4, wobei das Zirkonoxidstabilisierende Oxid Magnesiumoxid, Kalziumoxid und/oder Lanthanoxid ist.5. The system of claim 4, wherein the zirconia stabilizing oxide is magnesium oxide, calcium oxide and / or lanthanum oxide.
6. Verwendung einer Mischung A gemäß mindestens einem der Ansprüche 1 bis 5 zur Herstellung einer keramischen Fritte oder eines Glases als Schicht zwischen einem Material aus TZP und einer zur Verblendung von TZP Material geeigneten Verblendkeramik, wobei die Mischung 0,5 - 8 mol %, insbesondere 2 - 5 mol % Yttriumoxid, insbesondere Y2O3, und/oder 8 - 16 mol %, insbesondere 10 - 14 mol % Ceroxid, insbesondere CeO2 enthält.6. Use of a mixture A according to at least one of claims 1 to 5 for the production of a ceramic frit or a glass as a layer between a material made of TZP and a veneering ceramic suitable for veneering TZP material, the mixture 0.5 - 8 mol%, contains in particular 2-5 mol% yttrium oxide, in particular Y 2 O 3 , and / or 8-16 mol%, in particular 10-14 mol% cerium oxide, in particular CeO 2 .
7. Verwendung einer Mischung B gemäß mindestens einem Ansprüche 1 bis 5 zur Herstellung einer Verblendkeramik von vollkeramischen Gerüsten aus TZP, wobei die Mischung 0,5 - 8 mol %, insbesondere 2 - 5 mol % Yttriu- moxid, insbesondere Y2O3, und/oder 8 - 16 mol %, insbesondere 10 - 14 mol % Ceroxid, insbesondere CeO2 enthält.7. Use of a mixture B according to at least one of claims 1 to 5 for the production of a veneering ceramic of all-ceramic frameworks made of TZP, the mixture 0.5-8 mol%, in particular 2-5 mol%, yttrium oxide, in particular Y 2 O 3 , and / or 8-16 mol%, in particular 10-14 mol%, of cerium oxide, in particular CeO 2 .
8. Verwendung einer Mischung C gemäß Anspruch 2 oder 3 zur Herstellung eines Infiltrationsglases zur Infiltration von porösen oxidkeramischen Gerü- sten mit einem Gehalt von 0,5 - 8 mol %, insbesondere 2 - 5 mol % Yttriumoxid, insbesondere Y2O3, und/oder 8 - 16 mol %, insbesondere 10 - 14 mol % Ceroxid, insbesondere CeO2.8. Use of a mixture C according to claim 2 or 3 for the production of an infiltration glass for the infiltration of porous oxide-ceramic frameworks with a content of 0.5-8 mol%, in particular 2-5 mol%, yttrium oxide, in particular Y 2 O 3 , and / or 8 - 16 mol%, in particular 10 - 14 mol% of cerium oxide, in particular CeO 2 .
9. Verwendung gemäß Anspruch 8, wobei die Porosität des oxidkeramische Gerüst 1 - 40 Vol % beträgt.9. Use according to claim 8, wherein the porosity of the oxide-ceramic framework is 1-40 vol%.
10. Vollkeramischer Zahnersatz auf Basis eines dicht oder porös gesinterten Kernmaterials aus TZP als Ausgangsmaterial, eine Zwischenschicht A erhältlich durch Aufbringen der Mischung A gemäß Anspruch 1, einer Verblend- keramik B, erhältlich durch Aufbringen der Mischung B gemäß Anspruch 1 so wie im Falle eines porös gesinterten Kernmaterials Aufbringen der Mi- schung C gemäß Anspruch 2 zur Infiltration des porös gesinterten Kernmaterials. 10. All-ceramic dentures based on a dense or porous sintered core material made of TZP as the starting material, an intermediate layer A obtainable by applying the mixture A according to claim 1, a veneering ceramic B, obtainable by applying the mixture B according to claim 1 as in the case of a porous sintered core material Schung C according to claim 2 for infiltration of the porous sintered core material.
EP02785298A 2001-10-25 2002-10-24 System for producing a veneering ceramic Withdrawn EP1438000A1 (en)

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