公开(公告)号：US11964916B2

公开(公告)日：2024-04-23

申请号：US18072172

申请日：2022-11-30

Applicant: TOSOH CORPORATION

Inventor： Yuki Ushio ,  Akiko Ito ,  Sho Azechi ,  Hiroyuki Fujisaki

IPC: C04B35/488 ,  C04B26/06

CPC classification number: C04B35/4885 ,  C04B26/06 ,  C04B2235/3206 ,  C04B2235/3225 ,  C04B2235/3229 ,  C04B2235/602 ,  C04B2235/608 ,  C04B2235/66 ,  C04B2235/77 ,  C04B2235/9653 ,  C04B2237/343 ,  C04B2237/348 ,  C04B2237/525

Abstract: A layered body, which has a change in texture derived from zirconia, particularly a change in translucency and is suitable as a dental prosthetic member, a precursor thereof, or a method for producing these. The layered body has a structure in which two or more layers containing zirconia containing a stabilizer are layered, the layered body including at least: a first layer containing zirconia having a stabilizer content of higher than or equal to 4 mol %; and a second layer containing zirconia having a stabilizer content different from that of the zirconia contained in the first layer. At least one layer contains one or more elements capable of coloring zirconia.

公开(公告)号：US11746055B2

公开(公告)日：2023-09-05

申请号：US17944759

申请日：2022-09-14

Applicant: TOSOH CORPORATION

Inventor： Akiko Ito ,  Ayako Watanabe ,  Sho Azechi ,  Hitoshi Nagayama ,  Hiroyuki Fujisaki

IPC: C04B35/488 ,  C04B35/645

CPC classification number: C04B35/4885 ,  C04B35/645 ,  C04B2235/3217 ,  C04B2235/3246 ,  C04B2235/762 ,  C04B2235/765 ,  C04B2235/785 ,  C04B2235/786

Abstract: A zirconia powder is provided comprising a yttria source and zirconia, wherein a content of the yttria source is 4.5 mol % or more and 6.5 mol % or less and the remainder is zirconia, a ratio of a total of tetragonal and cubic crystals to an entire crystal phase of zirconia is 90% or less, a BET specific surface area is 7.5 m2/g or more and 15 m2/g or less, and an average crystallite size is 325 Å or greater. The powders are useful in producing sintered bodies having the mechanical strength and the translucency desired for use in dental prosthetic materials, and precursors thereof.

公开(公告)号：US11746054B2

公开(公告)日：2023-09-05

申请号：US17241274

申请日：2021-04-27

Applicant: TOSOH CORPORATION

Inventor： Kiyotaka Kawamura ,  Akiko Ito ,  Hiroyuki Fujisaki ,  Sho Azechi

IPC: C04B35/488 ,  A61C13/083 ,  C04B35/64

CPC classification number: C04B35/4885 ,  A61C13/083 ,  C04B35/64 ,  A61C2201/002 ,  C04B2235/3217 ,  C04B2235/3246 ,  C04B2235/656 ,  C04B2235/785 ,  C04B2235/786

Abstract: A method for manufacturing a zirconia sintered body includes molding a powder composition that has a yttria content of more than 3% by mole and 5.2% by mole or less and that contains a first zirconia powder having a yttria content of 2% by mole or more and 4% by mole or less and a second zirconia powder having a yttria content of more than 4% by mole and 6% by mole or less to obtain a green body, and sintering the green body to obtain a sintered body.

公开(公告)号：US11021401B2

公开(公告)日：2021-06-01

申请号：US16313393

申请日：2018-03-19

Applicant: TOSOH CORPORATION

Inventor： Kiyotaka Kawamura ,  Akiko Ito ,  Hiroyuki Fujisaki ,  Sho Azechi

IPC: C04B35/486 ,  C04B35/488 ,  A61C13/083 ,  C04B35/64

Abstract: Provided are a zirconia sintered body capable of being widely used as a dental material, in particular, a zirconia sintered body capable of being applied to both a dental material for a back tooth and a dental material for a front tooth and a simple and easy method for manufacturing the zirconia sintered body.
The method for manufacturing a zirconia sintered body includes a molding step of molding a powder composition that has an yttria content of more than 3% by mole and 5.2% by mole or less and that contains a first zirconia powder having an yttria content of 2% by mole or more and 4% by mole or less and a second zirconia powder having an yttria content of more than 4% by mole and 6% by mole or less to obtain a green body, and a sintering step of sintering the green body to obtain a sintered body.

公开(公告)号：US11548825B2

公开(公告)日：2023-01-10

申请号：US16801796

申请日：2020-02-26

Applicant: TOSOH CORPORATION

Inventor： Yuki Ushio ,  Akiko Ito ,  Sho Azechi ,  Hiroyuki Fujisaki

IPC: C04B35/488 ,  C04B26/06

Abstract: Provided is at least any of a layered body, which has a change in texture derived from zirconia, particularly a change in translucency and is suitable as a dental prosthetic member, a precursor thereof, or a method for producing these. There is provided a layered body having a structure in which two or more layers containing zirconia containing a stabilizer are layered, the layered body including at least: a first layer containing zirconia having a stabilizer content of higher than or equal to 4 mol %; and a second layer containing zirconia having a stabilizer content different from that of the zirconia contained in the first layer.

公开(公告)号：US11479511B2

公开(公告)日：2022-10-25

申请号：US17038646

申请日：2020-09-30

Applicant: TOSOH CORPORATION

Inventor： Akiko Ito ,  Ayako Watanabe ,  Sho Azechi ,  Hitoshi Nagayama ,  Hiroyuki Fujisaki

IPC: C04B35/488 ,  C04B35/645

Abstract: A zirconia sintered body is provided and includes yttria and zirconia, containing yttria by a content ranging from 4.5 mol % or more to 6.5 mol % or less and zirconia as the remainder, the total light transmittance of a 1-mm thick sample measured in compliance with JIS K 7361-1 being 46.5% or higher, the three-point bending strength being 700 MPa or higher, and a ratio of an integrated value for the total light transmittance to an integrated value for the parallel light transmittance of a 1-mm thick sample measured at the measurement wavelength ranging from 400 to 700 nm being 1.3% or less.