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公开(公告)号：US20230255734A1
公开(公告)日：2023-08-17
申请号：US18136575
申请日：2023-04-19
Applicant: SHOFU INC.
Inventor： Toshio KITAMURA , Rieko AIBA
CPC classification number: A61C13/0022 , A61C13/0004 , A61C13/082
Abstract: The present disclosure relates to a dental cutting zirconia blank having high relative density for preparing a dental restoration. More specifically, the present disclosure relates to a dental cutting zirconia blank which consists of a zirconia ceramics used for the cutting with the CAD/CAM system in the dental field, a semi-sinter zirconia blank (pre-sintered body) of which has high relative density, and which can provide a prosthesis device having high aesthetics after sintering. There is provided a dental cutting zirconia blank wherein the dental cutting zirconia blank has at least one layer consisting of zirconia powder containing 4 to 15 mol % of yttria or erbium oxide as a stabilizer, a relationship among pre-sintering density, final-sintering density and relative density satisfies the following relation:
54≤Relative density (%)={(Pre-sintering density)/(Perfect-sintering density)}×100≤70-
公开(公告)号：US20190380815A1
公开(公告)日：2019-12-19
申请号：US16357373
申请日：2019-03-19
Applicant: SHOFU INC.
Inventor： Rieko AIBA , Shuhei TAKAHASHI , Toshio KITAMURA
IPC: A61C13/00 , C04B35/486
Abstract: To provide a dental zirconia blank which has high permeability, can reproduce a color tone close to a natural tooth and a strength to be able to tolerate in oral cavity. Furthermore, to provide a dental zirconia blank from which a prosthesis device of 4 or more units having high strength can be prepared. To provide a dental zirconia blank having a plurality of layers, comprising; a first layer consisting of a high permeability ceramic containing 91.6 to 96.5 mol % of zirconium oxide and 3.5 to 8.4 mol % of yttrium oxide, and a second layer consisting of a low permeability ceramic containing 95.6 to 98.5 mol % of zirconium oxide and 1.5 to 4.4 mol % of yttrium oxide, wherein a content rate of yttrium oxide in the low permeability ceramic is lower than a content rate of yttrium oxide in the high permeability ceramic by 0.5 to 5.4 mol %, and the first layer is positioned at one end of the plurality of layers in a layering direction.
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公开(公告)号：US20240315816A1
公开(公告)日：2024-09-26
申请号：US18680250
申请日：2024-05-31
Applicant: SHOFU INC.
Inventor： Seiji BAN , Shuhei TAKAHASHI , Toshio KITAMURA , Rieko AIBA
CPC classification number: A61C13/0022 , A61C5/73 , C04B35/48 , C04B41/87 , C04B2235/3246 , C04B2235/94 , Y10T428/12229
Abstract: To provide a zirconia perfect sintered body which has a chroma of an excellent color tone and excellent translucency as compared with a zirconia mill blank for dental cutting and machining prepared from a zirconia raw material powder containing various stabilizing materials while maintaining high strength, and does not cause deformation. The zirconia mill blank of the present invention is a semi-fired zirconia mill blank for dental cutting and machining containing a semi-fired body of a ceramic particle, the zirconia mill blank for dental cutting and machining contains zirconium oxide, a stabilizing material consisting of an oxide, and a water-soluble compound salt which contains at least one element selected from calcium, magnesium and a rare earth element and is not an oxide, the content of the stabilizing material in terms of the oxide in the semi-fired body of the ceramic particle is within a range of 2 to 7 mol %, and the content of the water-soluble compound salt in the zirconia mill blank for dental cutting and machining is within a range of 0.1 to 3.5 mol %.
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公开(公告)号：US20180125616A1
公开(公告)日：2018-05-10
申请号：US15805396
申请日：2017-11-07
Applicant: SHOFU INC.
Inventor： Toshio KITAMURA , Rieko AIBA
CPC classification number: A61C13/0022 , A61C13/0004 , A61C13/082
Abstract: The present disclosure relates to a dental cutting zirconia blank having high relative density for preparing a dental restoration. More specifically, the present disclosure relates to a dental cutting zirconia blank which consists of a zirconia ceramics used for the cutting with the CAD/CAM system in the dental field, a semi-sinter zirconia blank (pre-sintered body) of which has high relative density, and which can provide a prosthesis device having high aesthetics after sintering. There is provided a dental cutting zirconia blank wherein the dental cutting zirconia blank has at least one layer consisting of zirconia powder containing 4 to 15 mol % of yttria or erbium oxide as a stabilizer, a relationship among pre-sintering density, final-sintering density and relative density satisfies the following relation: 54≤Relative density (%)={(Pre-sintering density)/(Perfect-sintering density)}×100≤70
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