WO2006032394A1 - Dentalkeramik und verfahren zu ihrer herstellung - Google Patents
Dentalkeramik und verfahren zu ihrer herstellung Download PDFInfo
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- WO2006032394A1 WO2006032394A1 PCT/EP2005/009854 EP2005009854W WO2006032394A1 WO 2006032394 A1 WO2006032394 A1 WO 2006032394A1 EP 2005009854 W EP2005009854 W EP 2005009854W WO 2006032394 A1 WO2006032394 A1 WO 2006032394A1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
- C04B35/481—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates containing silicon, e.g. zircon
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
- C04B35/486—Fine ceramics
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- C04B35/4885—Composites with aluminium oxide
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
- C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
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- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
- C04B2235/3246—Stabilised zirconias, e.g. YSZ or cerium stabilised zirconia
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- C04B2235/3891—Silicides, e.g. molybdenum disilicide, iron silicide
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- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
- C04B2235/483—Si-containing organic compounds, e.g. silicone resins, (poly)silanes, (poly)siloxanes or (poly)silazanes
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Definitions
- the invention relates to a dental ceramic and a process for their preparation.
- Ceramics which are suitable as dental ceramics for use in dental technology must meet special requirements. These include, in particular, a low chemical solubility and a color which makes it possible to color it to basic dental colors or to color it with stains.
- DIN EN ISO 6872 sets the upper limit for the chemical solubility of dental ceramics at 100 ⁇ g / cm 2 .
- silicate or oxide ceramics are suitable, with oxide ceramics being comparable in comparison with, for example, ceramics.
- B. can not simply bring to so-called press ceramics in the desired shape. From ceramic powders initially so-called green bodies are produced, which are then sintered. During sintering of the porous green bodies, the powder particles condense to the solid ceramic, but inevitably a shrinkage of the volume of up to 50 percent occurs. This sintering shrinkage must be taken into account in each case during the production of the ceramic tooth replacement.
- DE 195 47 129 discloses a method for shrinkage-free production of oxide ceramic sintered body from a powdery oxide ceramic such. Zirconia or alumina, a powdery intermetallic compound and a silicon-organic polymer.
- a powdery oxide ceramic such. Zirconia or alumina, a powdery intermetallic compound and a silicon-organic polymer.
- the color of the ceramics produced by this method is not white but greenish-yellow and their chemical solub
- the product information New Improved Zirconia Powder from Tosoh, Japan, 1999, it can be seen that an addition of 0.25 wt.% Alumina Al 2 O 3 as a sintering aid to zirconia, the sintering temperature by about 100 0 C lowered.
- a dental ceramic is to be provided, which can be produced without shrinkage, the low chemical Solubility and a color that allows a coloring ' on dental Grund ⁇ colors or a color design with stains has.
- An inventive oxide ceramic sintered body comprises
- an alkali metal or alkaline earth metal oxide preferably magnesium oxide MgO, more preferably from 0.25% by weight to 0.75% by weight, in particular approximately 0.4% by weight, of magnesium oxide MgO and wherein the in each case to a total of at most 100% by weight.
- the oxide-ceramic sintered body according to the invention may additionally comprise up to 2% by weight, preferably 1.5% by weight, of yttrium oxide Y 2 O 3 added in the form of yttrium-stabilized zirconium dioxide ZrO 2 during production.
- the chemical solubility of the ceramic according to the invention falls far short of the upper limit value of 100 ⁇ g / cm 2 for dental ceramics laid down in DIN EN ISO 6872.
- the chemical solubility is less than 20 ⁇ g / cm 2 ; values of chemical solubility below 10 ⁇ g / cm 2 are particularly preferred.
- the color of the ceramic according to the invention is almost white and can therefore easily be pigmented onto the basic dental colors. This observation is followed by the following preferred values for the parameters L *, a * and b * in the L * a * b * system of the Commission Internationale de l'Eclairage (CIE):
- L * preferably assumes a value between 92 and 96, i.
- the color of the ceramic is perceived by the retina of the human eye as desired bright and can be darkened by additions to the basic dental colors.
- a * preferably takes on a value between -L- 'and +2, more preferably between +1.5 and -1.5, i. the retina of the eye perceives the ceramic as white. This shade can be shifted by suitable pigments into further desired shades.
- b * preferably takes on a value between 0 and 10, more preferably between 0 and 4, i.
- the ceramics cause in the eye of the beholder a white to at most slightly yellowish feeling, which is contrary to the coloring in the dental basic colors.
- the addition of at least 1 wt.% Al 2 O 3 causes the chemical solubility to decrease significantly, while the addition of at least 3 wt.% Al 2 O 3 causes the ceramic to be white and no longer yellowish.
- the addition of magnesium oxide MgO serves to improve the sintering behavior, while the sole addition of aluminum oxide Al 2 O 3 does not lead to an improvement in the sintering behavior.
- magnesium oxide MgO other alkali metal or alkaline earth metal oxides, such as.
- calcium oxide CaO use in a specific for each element concentration, which can be easily determined by routine experimentation.
- the alumina content affects the properties of the ceramic; whose Concentration influence depends on the selected alkali metal or alkaline earth metal oxide.
- a homogeneous mixture of monoclinic or optionally yttrium-stabilized zirconium dioxide ZrO 2 , aluminum oxide Al 2 O 3 , magnesium oxide MgO and zirconium disilicide ZrSi 2 , an organosilicon compound such as methylpolysiloxane and a molding assistant is first prepared. From this homogeneous mixture, a green body is then formed, which already has the desired shape or brought into the desired shape by machining (eg milling) and which is then compacted (sintered) by a reaction sintering process to the dental ceramic.
- additional suitable pigments are added to this homogeneous mixture which color the dental ceramic completely in the desired color.
- the ceramic according to the invention is distinguished by the fact that it can be manufactured with little or no shrinkage, ie with dimensional and dimensional accuracy.
- the density p G of the green body is selected so that the density p D of the dental ceramic has a value of
- m G is the mass of the green body and m D is the mass of the dental ceramic. This ensures that overall no sintering shrinkage occurs.
- the green body consisting of zirconium disilicide, monoclinic zirconium dioxide, magnesium oxide, aluminum oxide, methylpolysiloxane and an organic pressing aid, was compacted to ceramic by a reaction sintering process, this dense zirconium-based ceramic having a Zr / Si ratio of 0, 8 had.
- the proportion of magnesium oxide was 0.4 wt.%, While the proportion of alumina between 0 to 16 wt.% was varied. This resulted in the following ceramics:
- the sintered densities p D in g / cm 3 of the ceramics No. 4 to No. 8 and curves 4, 5 ... 8 are the value (1 + ⁇ m ) • p G in g / cm 3 of ceramics No. 4 to No. 8 at the specified axial compression pressure in MPa during green body production. Schwindungswill the ceramic occurs when intersecting the corresponding curves 4 'and 4, 5' and 5, etc. intersect. This condition is met by the ceramics No. 4 to No. 6, which are therefore in the most preferred range. While the cut points for the ceramics No. 4 and No. 5 can be taken directly from the figure, a higher pressing pressure than 600 MPa is required for the ceramics No. 6. Likewise suitable as dental ceramics are the ceramics No. 3 and No. 7, which thus essentially narrow the preferred range. Embodiment 2
- the green body consisting of zirconium disilicide, yttrium-stabilized zirconium dioxide (3 mol% Y.sub.2O.sub.3), magnesium oxide, aluminum oxide, methylpolysiloxane and an organic pressing aid, was compacted into a ceramic by a sintering reaction process, this dense zirconium-based ceramic being a Zr / Si Ratio of 0.8.
- the proportion of magnesium oxide was 0.4% by weight, while the proportion of aluminum oxide was varied between 0 to 5.4% by weight.
- the following ceramics were obtained:
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT05789888T ATE551310T1 (de) | 2004-09-21 | 2005-09-14 | Dentalkeramik und verfahren zu ihrer herstellung |
EP05789888A EP1793794B1 (de) | 2004-09-21 | 2005-09-14 | Dentalkeramik und verfahren zu ihrer herstellung |
JP2007532801A JP4838803B2 (ja) | 2004-09-21 | 2005-09-14 | 歯科用セラミックスおよび該歯科用セラミックスを製造するための方法 |
US11/705,341 US7566674B2 (en) | 2004-09-21 | 2007-02-12 | Dental ceramics and method for the manufacture thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004045752A DE102004045752B3 (de) | 2004-09-21 | 2004-09-21 | Verwendung einer Keramik als Dentalkeramik |
DE102004045752.2 | 2004-09-21 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/705,341 Continuation-In-Part US7566674B2 (en) | 2004-09-21 | 2007-02-12 | Dental ceramics and method for the manufacture thereof |
Publications (1)
Publication Number | Publication Date |
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WO2006032394A1 true WO2006032394A1 (de) | 2006-03-30 |
Family
ID=35455931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2005/009854 WO2006032394A1 (de) | 2004-09-21 | 2005-09-14 | Dentalkeramik und verfahren zu ihrer herstellung |
Country Status (6)
Country | Link |
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US (1) | US7566674B2 (de) |
EP (1) | EP1793794B1 (de) |
JP (1) | JP4838803B2 (de) |
AT (1) | ATE551310T1 (de) |
DE (1) | DE102004045752B3 (de) |
WO (1) | WO2006032394A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7566674B2 (en) | 2004-09-21 | 2009-07-28 | Forschungszentrum Karlsruhe Gmbh | Dental ceramics and method for the manufacture thereof |
JP2015003271A (ja) * | 2006-08-25 | 2015-01-08 | セラムテック ゲゼルシャフト ミット ベシュレンクテル ハフツングCeramTec GmbH | 特に歯科医学的に適用するための着色セラミックス焼結体の製造法 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060166159A1 (en) | 2005-01-25 | 2006-07-27 | Norbert Abels | Laser shaping of green metal body used in manufacturing an orthodontic bracket |
US20060163774A1 (en) * | 2005-01-25 | 2006-07-27 | Norbert Abels | Methods for shaping green bodies and articles made by such methods |
DE102006024489A1 (de) * | 2006-05-26 | 2007-11-29 | Forschungszentrum Karlsruhe Gmbh | Grünkörper, Verfahren zur Herstellung einer Keramik und deren Verwendung |
JP5389518B2 (ja) * | 2008-04-28 | 2014-01-15 | クラレノリタケデンタル株式会社 | 歯科用組成物及びコンポジットレジン |
JP2010220779A (ja) * | 2009-03-23 | 2010-10-07 | Noritake Co Ltd | 歯科用セラミック仮焼体 |
WO2018156218A1 (en) * | 2016-11-07 | 2018-08-30 | The Regents Of The University Of Colorado, A Body Corporate | Improved performance of technical ceramics |
CN118421093A (zh) * | 2024-05-27 | 2024-08-02 | 赛维精密科技(广东)有限公司 | 一种防火隔热云母复合材料及其制备方法 |
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EP0631995A1 (de) * | 1993-06-24 | 1995-01-04 | Dentsply GmbH | Zahnprothese |
EP0690031A1 (de) * | 1994-07-01 | 1996-01-03 | Ivoclar Ag | Zr02-haltige Glaskeramik |
CN1489988A (zh) * | 2002-10-18 | 2004-04-21 | 中国科学院上海硅酸盐研究所 | 低成本可切削的氧化锆陶瓷牙科修复体及其制备方法 |
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JPS5250399B2 (de) * | 1972-05-18 | 1977-12-23 | ||
AT339523B (de) * | 1973-09-21 | 1977-10-25 | Jenaer Glaswerk Schott & Gen | Glaskeramik fur zahnfullmassen |
US4576919A (en) * | 1984-11-02 | 1986-03-18 | General Electric Company | Zircon-cordierite composite ceramic |
US4820666A (en) * | 1985-03-22 | 1989-04-11 | Noritake Co., Limited | Zirconia base ceramics |
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US6022819A (en) * | 1998-07-17 | 2000-02-08 | Jeneric/Pentron Incorporated | Dental porcelain compositions |
US6168435B1 (en) * | 1998-10-26 | 2001-01-02 | Implant Innovations, Inc. | Ceramic dental abutments with a metallic core |
DE19849388C2 (de) * | 1998-10-27 | 2001-05-17 | Schott Glas | Bariumfreies röntgenopakes Dentalglas sowie dessen Verwendung |
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2004
- 2004-09-21 DE DE102004045752A patent/DE102004045752B3/de not_active Expired - Fee Related
-
2005
- 2005-09-14 JP JP2007532801A patent/JP4838803B2/ja not_active Expired - Fee Related
- 2005-09-14 EP EP05789888A patent/EP1793794B1/de not_active Not-in-force
- 2005-09-14 WO PCT/EP2005/009854 patent/WO2006032394A1/de active Application Filing
- 2005-09-14 AT AT05789888T patent/ATE551310T1/de active
-
2007
- 2007-02-12 US US11/705,341 patent/US7566674B2/en not_active Expired - Fee Related
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7566674B2 (en) | 2004-09-21 | 2009-07-28 | Forschungszentrum Karlsruhe Gmbh | Dental ceramics and method for the manufacture thereof |
JP2015003271A (ja) * | 2006-08-25 | 2015-01-08 | セラムテック ゲゼルシャフト ミット ベシュレンクテル ハフツングCeramTec GmbH | 特に歯科医学的に適用するための着色セラミックス焼結体の製造法 |
Also Published As
Publication number | Publication date |
---|---|
JP2008513343A (ja) | 2008-05-01 |
DE102004045752B3 (de) | 2006-05-04 |
US20070142206A1 (en) | 2007-06-21 |
US7566674B2 (en) | 2009-07-28 |
EP1793794B1 (de) | 2012-03-28 |
ATE551310T1 (de) | 2012-04-15 |
EP1793794A1 (de) | 2007-06-13 |
JP4838803B2 (ja) | 2011-12-14 |
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