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Method for the production of an oxide ceramic shaped part and a part produced by such method

a technology of oxide ceramics and shaped parts, which is applied in the direction of ceramicware, impression caps, applications, etc., can solve the problems of long process time, required coating thickness of mixture ceramics, and security problems, and achieve cost-optimized production and improved aesthetic appearan

Inactive Publication Date: 2005-07-28
IVOCLAR VIVADENT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] In contrast, the present invention offers a solution to the challenge of providing a method for the production of an oxide ceramic shaped part as well as an oxide ceramic shaped part itself, that is more suitable for the realization of a dental restoration piece and that permits a cost-optimized production with a simultaneously improved aesthetic appearance without degrading the use properties of the thus-produced shaped part and offering, especially, the possibility to produce a retentive design and to ensure the securement of the shaped part on the natural tooth.
[0013] Surprisingly, the inventive configuration of an infiltration coating or covering on the relevant regions of the oxide ceramic part permits the realization of an increased securement of the entire oxide ceramic part. Evidently, the covering, or the at least partial covering of the oxide ceramic part with the coating imparted by the infiltration, stabilizes the oxide ceramic shaped part to such an extent that a clearly improved fracture strength approaching 6.5 MPa m1 / 2 can be achieved.
[0014] In a surprising manner, the inventive solution also leads to an improvement of the aesthetic appearance of a dental restoration piece if the inventive oxide ceramic shaped part is used as the dental restoration piece. The infiltration coating has a higher translucence while the infiltration-free inner region or core of the oxide ceramic has a reduced translucence and, in connection with the realization of a zirconium oxide ceramic, the coating is practically white. This simulates the human tooth in a surprisingly simple manner and is achieved without any need to deploy mixture ceramics, if such is desired.

Problems solved by technology

Due to the possible or optional omission of an additional mixed ceramic, the therewith connected problems also drop out such as the longer process time, the securement problems, and the required coating thickness of the mixture ceramic.

Method used

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  • Method for the production of an oxide ceramic shaped part and a part produced by such method
  • Method for the production of an oxide ceramic shaped part and a part produced by such method
  • Method for the production of an oxide ceramic shaped part and a part produced by such method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0053] A dry press granulate of ZrO2 powder is used for the raw material for the blank 10. It is doped with yttrium and comprises other components such as Al2O3. The dry press granulates can be, for example, those available from the TOSOH company with the commercial designation TZ-3YB and TZ-8YB and having a primary crystal size of 280-400 nm and a granulate size of 50 μm but, as well, can be the granulate available under the commercial designation of TZ-3Y20AB that is characterized by the addition thereto of 20% Al2O3 and that otherwise corresponds to the other granulates.

[0054] In accordance with the following table, powdery oxidized raw materials in predetermined mole portions are added to the zirconium oxide ceramics.

Raw MaterialTZ3YBTZ3YBTZ3YBTZ3YBTZ8YBTZ8YBTZ8YBOxideCeO2 / mol-%2.5581015——Er2O32.55—————CeO2 + Er2O3 / mol-%3 + 3——————Sc2O3 / mol-%3——————TiO2 / mol-%1015 ———1015

[0055] In this inventive experiment, cylindrical press forms with inner diameters of 12 and 16 mm were used...

example 2

[0072] In a modified example, in lieu of TEOS, a zirconium (IV) propylate (Zr(IV)Pr) was deployed. This zirconium (IV) propylate was used in lieu of TEOS and, when subjected to atmospheric pressure with water, was driven as zirconium oxide particles out of the pores of the blank. Also, in this connection, the pores could be closed, whereby the crystalline particles in the pores precipitate out, which corresponds to the actual base material. The thus achieved minimal coating thickness of the infiltration coating amounted to approximately 50 micrometers.

example 3

[0073] In total, the inventive process produced an oxide ceramic composite shaped part with high fracture strength, whereby the translucence properties corresponded to those of zirconium oxide ceramic (TZP) which are deployed in connection with the high-temperature isostatic press process.

DensityLightKic-Value(in theTransmission(Evans &Ptr / tInf. / (core) / CapabilityHV 10 / Charles) / SamplebarminVBr / Cg cm−3(comparison) %MPaMPa m1 / 2A12351000114806.0870.7——A12371000514806.1075.0——A1240100021480——132206.95A1245 90011480——130556.55A1246 900114806.0872.2——Mexoxitunknownunknownunknown6.0770.3128506.65Bio-HIPZeO2(comparisonmeasurement)Denzirunknownunknownunknown6.1076.4128306.70DO HIP-ZrO2(comparisonmeasurement)A1253 900Not14805.8856.4——infiltratedA1254 900Not1480——129006.17infiltrated

[0074] As can be seen in the foregoing, it is clear that the conventional sintered examples not produced in accordance with the present invention exhibit considerably worse properties with respect to light transmi...

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Abstract

A method for producing an oxide ceramic shaped part includes pressing a powder provided with a binding material or a powder mixture of an oxide ceramic into a shaped part, pre-sintering the shaped part at substantially atmospheric pressure and a temperature of 600 to 1,300° C., and evacuating a closed container in which the pre-sintered shaped part is disposed with the shaped part having a maximum density of 10 to 90%. The container is at an absolute pressure of less than 40 mbar. Subsequently, an infiltration material is applied onto the shaped part via infiltration with the infiltration material operating to seal off the shaped part relative to the surrounding atmosphere. The length of time of the infiltration is preferably 1 to 10 minutes.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims foreign priority benefits under 35 U.S.C. §119 from German patent application Ser. No. 10 2004 004 059.1 filed Jan. 27, 2004. TECHNICAL FIELD [0002] The present invention relates to a method for producing an oxide ceramic shaped part, as well as to an oxide ceramic shaped part. BACKGROUND OF THE INVENTION [0003] Methods for the production of an oxide ceramic shaped part have been known for a long time. For example, it is known from WO 95 / 35070 to produce a ceramic shaped part. In this approach, the ceramic is infiltrated. The production of an oxide ceramic shaped part of this type is, however, relatively time-consuming; the step alone of the infiltration that is undertaken in connection with this approach, requires, for example, 4 hours. [0004] Furthermore, it is known from EP-A 1 834 366 to produce a ceramic piece that is produced via the infiltration of a melted matrix material into the hollow space of a blank....

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61C5/77A61C13/00A61C13/083A61K6/027C04B35/48C04B35/488C04B38/00C04B41/45C04B41/49C04B41/50
CPCC04B35/481Y10T29/49568C04B35/488C04B2235/6562C04B2235/6567C04B2235/3225C04B2235/3217C04B2235/3246C04B2235/549C04B2235/5445C04B2235/5436C04B35/62695C04B2235/3229C04B2235/3224C04B35/49C04B2235/604C04B2235/608C04B2235/765C04B2235/616C04B2235/3418C04B2235/441C04B2235/785C04B35/624C04B2235/9653C04B2235/77C04B2235/96C04B2235/94C04B2235/95C04B2235/6587C04B2235/9661C04B2235/3272C04B2235/3262C04B2235/444C04B35/63488C04B41/87C04B2111/00836C04B41/009C04B41/4537C04B35/01C04B38/00C04B35/48C04B41/4515C04B41/5042C04B41/5035
Inventor ROTHBRUST, FRANKVAN T'HOEN, CHRISTIANHOLAND, WOLFRAMRHEINBERGER, VOLKER
Owner IVOCLAR VIVADENT AG
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