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公开(公告)号：US20230082975A1
公开(公告)日：2023-03-16
申请号：US17828656
申请日：2022-05-31
Applicant: SHOFU INC.
Inventor： Kazumichi NONAKA , Shuhei TAKAHASHI
Abstract: [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.-
2.发明申请公开(公告)号：US20210401553A1
公开(公告)日：2021-12-30
申请号：US17208086
申请日：2021-03-22
Applicant: SHOFU INC.
Inventor： Kazumichi NONAKA , Shuhei TAKAHASHI
IPC: A61C13/083 , A61C13/00 , A61K6/878
Abstract: [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.-
公开(公告)号：US20220202544A1
公开(公告)日：2022-06-30
申请号：US17502376
申请日：2021-10-15
Applicant: SHOFU INC.
Inventor： Kazumichi NONAKA , Shuhei TAKAHASHI
IPC: A61C13/08 , A61C13/00 , A61C13/083
Abstract: [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.-
公开(公告)号：US20210401552A1
公开(公告)日：2021-12-30
申请号：US17193466
申请日：2021-03-05
Applicant: SHOFU INC.
Inventor： Kazumichi NONAKA , Shuhei TAKAHASHI , Mitsuji TERAMAE
IPC: A61C13/00 , A61C13/083 , B32B18/00
Abstract: [Problem]
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 % Formula (1): 0.0 wt. %-
公开(公告)号：US20240164868A1
公开(公告)日：2024-05-23
申请号：US18423978
申请日：2024-01-26
Applicant: SHOFU INC.
Inventor： Kazumichi NONAKA , Shuhei TAKAHASHI
IPC: A61C1/08 , A61C3/02 , B22F3/04 , C04B35/622 , C04B38/00
CPC classification number: A61C1/08 , A61C3/02 , B22F3/04 , C04B35/622 , C04B38/0074 , B22F2003/242
Abstract: 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%.-
Patent Agency Ranking
公开(公告)号：US20220202656A1
公开(公告)日：2022-06-30
申请号：US17502404
申请日：2021-10-15
Applicant: SHOFU INC.
Inventor： Kazumichi NONAKA , Shuhei TAKAHASHI
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.-
公开(公告)号：US20200170753A1
公开(公告)日：2020-06-04
申请号：US16546426
申请日：2019-08-21
Applicant: SHOFU INC.
Inventor： Kazumichi NONAKA , Shuhei TAKAHASHI
Abstract: 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%.
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8.发明公开公开(公告)号：US20240270654A1
公开(公告)日：2024-08-15
申请号：US18384540
申请日：2023-10-27
Applicant: SHOFU INC.
Inventor： Kazumichi NONAKA , Shuhei TAKAHASHI
CPC classification number: C04B41/4535 , A61C13/0022 , C04B35/48 , C04B41/0072 , C04B41/5042 , C04B41/87 , C04B2235/3246 , C04B2235/75
Abstract: To provide a preparing method of a zirconia mill blank for dental cutting and machining having any one or more of translucency gradation, color gradation and strength gradation after perfect sintering by impregnating a zirconia calcined body with a plurality of impregnating solutions, which can suppress deterioration of the fitting property of a dental prosthesis device prepared from the zirconia mill blank for dental cutting and machining and a zirconia mill blank for dental cutting and machining having any one or more of translucency gradation, color gradation and strength gradation after perfect sintering and suppressing deterioration of the fitting property of a dental prosthesis device prepared from the zirconia mill blank for dental cutting and machining.
To porovide a zirconia mill blank for dental cutting and machining of the present invention is a preparing method of a zirconia mill blank for dental cutting and machining having any one or more of translucency gradation, color gradation and strength gradation after perfect sintering, comprising a step of impregnating a zirconia calcined body with at least two types of impregnating solutions, wherein at least one of the impregnating liquids contains a zirconium component, and in a case in which the total of metal ion concentrations (mass %) contained in each impregnating liquid is defined as Ctotal, the difference ΔCtotal which is a difference between Ctotal of each impregnating liquid is 5.0 or less.-
9.发明公开公开(公告)号：US20240261070A1
公开(公告)日：2024-08-08
申请号：US18384532
申请日：2023-10-27
Applicant: SHOFU INC.
Inventor： Kazumichi NONAKA , Shuhei TAKAHASHI
CPC classification number: A61C13/0022 , A61K6/818
Abstract: 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 ASP(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.
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公开(公告)号：US20200331807A1
公开(公告)日：2020-10-22
申请号：US16747634
申请日：2020-01-21
Applicant: SHOFU INC.
Inventor： Kazumichi NONAKA , Shuhei TAKAHASHI
Abstract: An object of the present disclosure 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 disclosure 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 disclosure contains a gallium compound.
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