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    Dental zirconia blank having multilayer structure different in content of yttria
    1.
    发明授权
    Dental zirconia blank having multilayer structure different in content of yttria 有权

    公开(公告)号：US12213849B2

    公开(公告)日：2025-02-04

    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.

    Zirconia mill blank for dental cutting and machining and preparing method thereof, and transparency improving liquid for zirconia mill blank for dental cutting and machining and using method thereof
    2.
    发明授权
    Zirconia mill blank for dental cutting and machining and preparing method thereof, and transparency improving liquid for zirconia mill blank for dental cutting and machining and using method thereof 有权

    公开(公告)号：US12193897B2

    公开(公告)日：2025-01-14

    申请号：US16487129

    申请日：2018-02-20

    Applicant: SHOFU INC.

    Inventor： Seiji Ban ,  Shuhei Takahashi ,  Toshio Kitamura ,  Rieko Aiba

    IPC: A61C13/00 ,  A61C5/73 ,  C04B35/48 ,  C04B41/87

    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 %.

    Indium-containing translucency improving liquid for dental zirconia calcined body
    3.
    发明授权
    Indium-containing translucency improving liquid for dental zirconia calcined body 有权

    公开(公告)号：US12194112B2

    公开(公告)日：2025-01-14

    申请号：US17502404

    申请日：2021-10-15

    Applicant: SHOFU INC.

    Inventor： Kazumichi Nonaka ,  Shuhei Takahashi

    IPC: A61K6/84 ,  A61K6/818

    Abstract: To provide a liquid for improving translucency for dental zirconia calcined body which may impart high translucency which is similar to an enamel of a natural tooth to a zirconia sintered body and a method for using thereof.
    The liquid for improving translucency for dental zirconia calcined body of the present disclosure contains a solvent and an indium compound, wherein a content of the indium compound based on the total amount of the liquid improving translucency for dental zirconia calcined body is within a range of 2.0 wt. % to 20.0 wt. % in terms of indium.

    Ceramic mill blank for dental cutting and machining
    5.
    发明授权
    Ceramic mill blank for dental cutting and machining 有权

    公开(公告)号：US12295802B2

    公开(公告)日：2025-05-13

    申请号：US18234611

    申请日：2023-08-16

    Applicant: SHOFU INC.

    Inventor： Shuhei Takahashi ,  Satoshi Fujiwara ,  Munehira Takenaka

    IPC: B32B7/12 ,  A61C13/00 ,  B32B3/30

    Abstract: To provide a ceramic mill blank for dental cutting and machining in which cracks or chips are not caused on the outer edge of the ceramic mill blank even if attaching to and detaching from a dental milling machine are repeated and it is possible to machine the vicinity of the outer edge of the ceramic mill blank.
    To provide a ceramic mill blank for dental cutting and machining, wherein, the ceramic mill blank for dental cutting and machining comprises a ceramic portion to be cut and machined and one or more seal members, the ceramic portion consists of a ceramic material which is not finally sintered, the ceramic portion has an outer peripheral surface which is engageable with a holding tool, the one or more seal members are provided on the outer peripheral surface of the ceramic portion, and a length of the one or more seal members is 50% or more of a length in a circumferential direction of the outer peripheral surface provided with the one or more seal members.

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