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1. 发明公开

EP4371967A1 ZIRCONIA MILL BLANK 审中-公开
公开(公告)号：EP4371967A1
公开(公告)日：2024-05-22
申请号：EP23206601.9
申请日：2023-10-30
申请人： Shofu Inc.
发明人： NONAKA, Kazumichi , TAKAHASHI, Shuhei
IPC分类号： C04B41/00 , C04B41/52 , C04B35/486 , C04B35/632 , C04B35/634 , C04B35/638 , A61C13/00 , A61C13/083 , A61K6/818 , A61K6/822 , C04B111/00 , C04B111/82
CPC分类号： C04B2111/0040520130101 , C04B2111/0083620130101 , C04B2111/8220130101 , C04B41/009 , C04B41/52 , C04B35/486 , C04B35/632 , C04B35/63488 , C04B35/638 , C04B2235/965320130101 , C04B2235/961520130101 , C04B2235/77520130101 , C04B2235/7720130101 , C04B2235/7520130101 , C04B2235/656720130101 , C04B2235/61620130101 , C04B2235/44320130101 , C04B2235/44920130101 , C04B2235/322420130101 , C04B2235/322520130101 , C04B2235/327220130101 , C04B2235/327920130101 , A61C13/083 , A61K6/818 , A61C13/0022
摘要： To provide a zirconia mill blank for dental cutting and machining that can impart translucency gradation and color gradation similar to a natural tooth to a zirconia perfect sintered body without the need for special equipment.
To provide a zirconia mill blank for dental cutting and machining comprising
two opposing surfaces and a side surface between the two opposing surfaces, wherein
the side surface has a rectangular shape in a side view of the zirconia mill blank for dental cutting and machining, and
in a case in which
one of the two opposing surfaces is defined as surface A,
the other surface of the two opposing surfaces is defined as surface B,
a surface which is parallel to the surface A and is located at a position of 1.0 mm to 1.5 mm from the surface A toward the surface B in a direction parallel to the side surface is defined as surface C,
points which are set to having 0.5 mm of distance on the straight line in the direction parallel to the side surface from the surface C toward the surface B in the area from the surface C to the surface B are defined as point P(1), point P(2), to point P(n) in the order from the surface C,
a stabilizer concentration (mol%) at each point is defined as SP(1), SP(2), to SP(n) (n ≥ ((shortest distance (mm) between the surface C and the surface B) - 2)/0.5),
the maximum value of the stabilizer concentration (mol%) is defined as SPmax,
the minimum value of the stabilizer concentration (mol%) is defined as SPmin, and
the maximum value of ΔSP(m) defined by the following formula is defined as ΔSPmax,

the zirconia mill blank for dental cutting and machining has a portion where the value of "SPmax - Spmin" which is a difference between the SPmax and the SPmin is 0.3 or more, and the ΔSPmax is less than 0.5. ΔSPm=SPm−SPm+1m=1,2,…n−1

2. 发明公开

EP4112581A1 SINTERING METHOD FOR DENTAL ZIRCONIA CALCINED BODY 有权
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.

3. 发明公开

EP4324425A1 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.

4. 发明公开

EP3892461A1 ZIRCONIA MILL BLANK HAVING LAYERS WITH DIFFERENT CONTENTS OF YTTRIA AND ALUMINA 审中-实审
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

5. 发明公开

EP3636621A2 ZIRCONIA MILL BLANK FOR DENTAL CUTTING AND MACHINING AND PREPARING METHOD THEREOF 审中-实审
公开(公告)号：EP3636621A2
公开(公告)日：2020-04-15
申请号：EP19192506.4
申请日：2019-08-20
申请人： Shofu Inc.
发明人： NONAKA, Kazumichi , TAKAHASHI, Shuhei
IPC分类号： C04B35/628 , C04B35/645 , C04B35/486 , A61C13/00
摘要： To provide a zirconia mill blank for dental cutting and machining which has excellent machinability in a thin workpiece such as an inlay, an onlay and a veneer, and may impart high strength and high translucency to a zirconia perfect sintered body without a special sintering such as HIP treatment, and a preparing method thereof.
The zirconia mill blank for dental cutting and machining has a porosity within a range of 15 to 30 %.

6. 发明公开

EP4371548A2 OPAQUE IMPARTING LIQUID FOR ZIRCONIA 审中-公开
公开(公告)号：EP4371548A2
公开(公告)日：2024-05-22
申请号：EP24166121.4
申请日：2019-03-26
申请人： Shofu Inc.
发明人： KITAMURA, Toshio , TAKAHASHI, Shuhei
IPC分类号： A61K6/00
CPC分类号： C04B41/009 , C04B41/5007 , C04B41/85 , C04B2111/0083620130101 , C04B2111/8020130101 , A61C13/083 , A61C13/0022 , A61C13/082 , A61C5/77 , A61K6/16 , A61K6/78 , A61K6/818
摘要： To provide a liquid material which can only adjust transparency by applying on a part of a zirconia crown having high transparency, without coloring.
The present invention provides an opaque imparting liquid used for a prosthesis device cut and machined from a dental zirconia for cutting and machining, comprising;
(a) 10 to 39 wt.% of a water-soluble aluminum compound and/or a water-soluble lanthanum compound,
(b) 60 to 89 wt.% of water, and
(c) 1 to 20 wt.% of an organic solvent.

7. 发明公开

EP4005998A1 DENTAL ZIRCONIA MILL BLANK FOR CUTTING AND MACHINING INCLUDING INDIUM AND YTTRIUM 审中-实审
公开(公告)号：EP4005998A1
公开(公告)日：2022-06-01
申请号：EP21202787.4
申请日：2021-10-15
申请人： Shofu Inc.
发明人： NONAKA, Kazumichi , TAKAHASHI, Shuhei
IPC分类号： C04B35/486 , C04B35/488 , C04B35/64 , A61C13/00 , C04B41/00 , C04B41/50 , C04B41/85
摘要： [Problem]
A technique for imparting high translucency which is similar to an enamel of a natural tooth to a zirconia sintered body, has been required.
[Solution]
To provide a zirconia mill blank for dental cutting and machining, containing, an yttrium compound and an indium compound as stabilizers, wherein, an amount of the yttrium compound is within a range of 3.0 mol% to 6.0 mol% in terms of oxide, an amount of the indium compound is within a range of 0.2 mol% to 3.0 mol% in terms of oxide, and a total amount of the yttrium compound and the indium compound is within a range of 5.5 mol% to 7.0 mol% in terms of oxide.

8. 发明公开

EP4000592A1 INDIUM-CONTAINING TRANSLUCENCY IMPROVING LIQUID FOR DENTAL ZIRCONIA CALCINED BODY 审中-实审
公开(公告)号：EP4000592A1
公开(公告)日：2022-05-25
申请号：EP21202786.6
申请日：2021-10-15
申请人： Shofu Inc.
发明人： NONAKA, Kazumichi , TAKAHASHI, Shuhei
IPC分类号： A61K6/16 , A61K6/802 , A61K6/818 , C04B41/00 , C04B41/45 , C04B41/85 , A61C13/083
摘要： [Problem] 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.
[Solution] The liquid for improving translucency for dental zirconia calcined body of the present invention 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.

9. 发明公开

EP3892254A1 PREPARING METHOD OF ZIRCONIA MILL BLANK FOR DENTAL CUTTING AND MACHINING USING PRECIPITATE 审中-实审
公开(公告)号：EP3892254A1
公开(公告)日：2021-10-13
申请号：EP21164633.6
申请日：2021-03-24
申请人： Shofu Inc.
发明人： NONAKA, Kazumichi , TAKAHASHI, Shuhei
IPC分类号： A61K6/818 , A61K6/822 , A61K6/824 , A61C13/00 , A61L27/42 , C04B35/488
摘要： [Problem]
To support the metal without segregation on the zirconia mill blank for dental cutting and machining which has been adjusted to a hardness that enables to cut and machine by calcining at a low temperature.
[Solution]
A zirconia mill blank for dental cutting and machining is prepared by A preparing method of a zirconia mill blank for dental cutting and machining, comprising an impregnation step of impregnating a porous zirconia molded body with an impregnating solution containing at least one metal ion and at least one precipitant, and a deposition step of decomposing the precipitant in the porous zirconia molded body to deposit a metal compound.

10. 发明公开

EP3712121A1 HIGH PERMEABLE ZIRCONIA BLANK CAPABLE OF SINTERING AT HIGH SPEED 审中-实审
公开(公告)号：EP3712121A1
公开(公告)日：2020-09-23
申请号：EP20152600.1
申请日：2020-01-20
申请人： Shofu Inc.
发明人： NONAKA, Kazumichi , TAKAHASHI, Shuhei
IPC分类号： C04B35/486 , A61C13/00
摘要： An object of the present invention is to provide a zirconia mill blank for dental cutting and machining which may impart high translucency similar to an enamel of a natural tooth to zirconia sintered body even in a short time sintering, and a preparing method thereof. In addition, the present invention provides a zirconia mill blank for dental cutting and machining which may impart the same degree of translucency to a zirconia sintered body even in a short time sintering as compared with the case of sintering for 427 minutes.
The zirconia mill blank for dental cutting and machining of the present invention contains a gallium compound.

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