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    SINTERING METHOD FOR DENTAL ZIRCONIA CALCINED BODY
    2.
    发明公开
    SINTERING METHOD FOR DENTAL ZIRCONIA CALCINED BODY 审中-公开

    公开(公告)号：EP4112581A1

    公开(公告)日：2023-01-04

    申请号：EP22176181.0

    申请日：2022-05-30

    申请人： Shofu Inc.

    发明人： NONAKA, Kazumichi ,  TAKAHASHI, Shuhei

    IPC分类号： C04B35/486 ,  C04B35/64

    摘要： [Problem]
    A technique for improving translucency in order to prepare a zirconia sintered body having high translucency without using special equipment, has been required.
    [Solution]
    To provide A sintering method for a dental zirconia calcined body containing 5.5 mol% to 7.0 mol% of a stabilizer,
    wherein the method satisfies the following (a) to (c).
    (a) an average rate of temperature increase in the section from room temperature to 1300 °C is 9 °C/min or more.
    (b) an average rate of temperature increase in the section from 1300 °C to 1400 °C is 0.6 °C/min or more and 3 °C/min or less.
    (c) an average rate of temperature increase in the section from 1400 °C to the maximum temperature of the sintering process is 0.5 °C/min or more and 2.5 °C/min or less.

    CERAMIC MILL BLANK FOR DENTAL CUTTING AND MACHINING
    3.
    发明公开
    CERAMIC MILL BLANK FOR DENTAL CUTTING AND MACHINING 审中-公开

    公开(公告)号：EP4324425A1

    公开(公告)日：2024-02-21

    申请号：EP23191693.3

    申请日：2023-08-16

    申请人： Shofu Inc.

    发明人： TAKAHASHI, Shuhei ,  FUJIWARA, Satoshi ,  TAKENAKA, Munehira

    IPC分类号： A61C13/00

    摘要： 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.

    ZIRCONIA MILL BLANK HAVING LAYERS WITH DIFFERENT CONTENTS OF YTTRIA AND ALUMINA
    4.
    发明公开
    ZIRCONIA MILL BLANK HAVING LAYERS WITH DIFFERENT CONTENTS OF YTTRIA AND ALUMINA 审中-公开

    公开(公告)号：EP3892461A1

    公开(公告)日：2021-10-13

    申请号：EP21160631.4

    申请日：2021-03-04

    申请人： Shofu Inc.

    发明人： NONAKA, Kazumichi ,  TAKAHASHI, Shuhei ,  TERAMAE, Mitsuji

    IPC分类号： B32B18/00 ,  C04B35/488 ,  A61C13/00

    摘要： To provide a zirconia mill blank for dental cutting and machining which may impart reproducibility of color tone similar to a natural tooth and high strength to a zirconia perfect sintered body without a special sintering method such as HIP treatment.
    [Solution]
    A zirconia mill blank for dental cutting and machining comprises at least two intermediate layers LA and LB which satisfy the following Formula (1) and Formula (2), wherein the layer LA is contained in a section A in which a distance from one plane of two planes is within 40 % of the distance between the two planes and the layer LB is contained in a section B in which a distance from the other plane is within 40 % of the distance between the two planes, wherein
    in a case in which, a sintered body prepared by sintering at 1550 °C a test specimen cut out from the layer LA is defined as sintered body SA, a sintered body at 1550 °C prepared by sintering a test specimen cut out from the layer LB is defined as sintered body SB, a contrast ratio of the sintered body SA at a sample having a thickness of 1 mm is defined as contrast ratio CA and a contrast ratio of the sintered body SB at a sample having a thickness of 1 mm is defined as contrast ratio CB, the contrast ratios CA and CB satisfy the following Formula (3),
    change directions of yttria concentration, alumina concentration and contrast ratio in a stacking direction are not changed by the at least two intermediate layers. Yttria concentration of layer LA − Yttria concentration of layer LB > 1.0 mol % 0.0 wt . % Alumina concentration of layer LB − Alumina concentration of layer LA 0.3 wt . % 0.71 ≤ Contrast ratio CA / Contrast ratio CB ≤ 0.86