公开(公告)号：US20180221120A1

公开(公告)日：2018-08-09

申请号：US15944387

申请日：2018-04-03

Applicant: TOSOH CORPORATION

Inventor： Hiroyuki FUJISAKI ,  Kiyotaka KAWAMURA

IPC: A61C13/08 ,  C04B35/64 ,  C04B35/488 ,  A61C13/083

Abstract: A zirconia sintered body is provided having a color tone equivalent to the color tone guides of various natural teeth and having the same aesthetics as a natural front tooth. The present invention provides a colored translucent zirconia sintered body comprising zirconia containing greater than 4.0 mol % and not greater than 6.5 mol % of yttria, less than 0.25 mol % of erbia, less than 2,000 ppm of iron oxide in terms of Fe2O3, less than 0.01 wt. % of cobalt oxide in terms of CoO, and less than 0.1 wt. % of alumina; the zirconia sintered body having a relative density of not less than 99.90%, a total light transmittance of not less than 25% and less than 40% for light having a wavelength of 600 nm at a sample thickness of 1.0 mm, and a strength of not less than 500 MPa.

公开(公告)号：US20240376012A1

公开(公告)日：2024-11-14

申请号：US18691559

申请日：2022-09-15

Applicant: TOSOH CORPORATION

Inventor： Sho AZECHI ,  Yuya HIGUCHI ,  Hiroyuki FUJISAKI ,  Hitoshi NAGAYAMA ,  Kiyotaka KAWAMURA

IPC: C04B35/488 ,  C04B35/64

Abstract: Provided is a powder composition that includes, as a matrix, a zirconia having a high content of a stabilizing element and that can provide, through short-time sintering, a sintered body satisfying translucency and mechanical strength required for dental prosthetic materials, in particular, prosthetic anterior teeth. Provided is a powder composition including two or more stabilized zirconias having different contents of a stabilizing element, in which the powder composition has a content of the stabilizing element of more than 4.0 mol % and 5.8 mol % or less, a rate of change in thermal shrinkage rate per unit temperature at 1,300° C. is 0.07% C−1 or less, and the contents of the stabilizing element of the stabilized zirconias are each 8.0 mol % or less.

公开(公告)号：US20210246075A1

公开(公告)日：2021-08-12

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

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：US20150315086A1

公开(公告)日：2015-11-05

申请号：US14651375

申请日：2013-12-26

Applicant: TOSOH CORPORATION

Inventor： Kiyotaka KAWAMURA ,  Hiroyuki FUJISAKI

IPC: C04B35/488 ,  A61K6/02

CPC classification number: C04B35/4885 ,  A61C7/14 ,  A61C13/0022 ,  A61K6/0005 ,  A61K6/0094 ,  A61K6/024 ,  A61K6/025 ,  C04B35/486 ,  C04B35/6262 ,  C04B35/62655 ,  C04B35/6455 ,  C04B2235/3217 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3244 ,  C04B2235/3272 ,  C04B2235/3275 ,  C04B2235/5409 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/6562 ,  C04B2235/72 ,  C04B2235/76 ,  C04B2235/77 ,  C04B2235/785 ,  C04B2235/9653 ,  C04B2235/9661

Abstract: A pink-colored zirconia sintered body has a high sintered body density and strength, and a colored translucency, which has a color tone similar to teeth and excellent translucency and has high aesthetic properties. A colored translucent zirconia sintered body includes from 2 to 4 mol % of yttria, from 0.02 to 0.8 mol % of Er2O3, at least 20 and less than 2,000 ppm, as calculated as Fe2O3, of an iron compound, at least 0.005 and less than 0.2 wt % of Al2O3 and the rest being zirconia, and having a lightness L* of from 55 to 75, a* of from 0 to 10 and b* of from 0 to 30 as chromatic parameters stipulated in JIS-Z8729, has a relative density of at least 99.80% and has a total light transmittance of at least 18% and at most 40% as measured at a sample thickness of 1 mm using a D65 light source.

Abstract translation: 粉红色的氧化锆烧结体具有高的烧结体密度和强度，并且具有与牙齿相似的色调和优异的半透明性并且具有高的美观性的着色半透明度。 彩色半透明的氧化锆烧结体包含2至4摩尔％的氧化钇，0.02至0.8摩尔％的Er2O3，至少20和小于2000ppm（以Fe 2 O 3计）为铁化合物，至少0.005和小于 0.2重量％的Al 2 O 3，其余为氧化锆，其亮度L *为55〜75，a *为0〜10，b *为0〜30，作为JIS-Z8729中规定的色参数， 密度至少为99.80％，并且使用D65光源在样品厚度为1mm测量时具有至少18％和至多40％的总透光率。

公开(公告)号：US20200223756A1

公开(公告)日：2020-07-16

申请号：US16313393

申请日：2018-03-19

Applicant: TOSOH CORPORATION

Inventor： Kiyotaka KAWAMURA ,  Akiko ITO ,  Hiroyuki FUJISAKI ,  Sho AZECHI

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

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：US20170143458A1

公开(公告)日：2017-05-25

申请号：US15321011

申请日：2015-06-22

Applicant: TOSOH CORPORATION

Inventor： Hiroyuki FUJISAKI ,  Kiyotaka KAWAMURA

IPC: A61C13/08 ,  C04B35/488 ,  C04B35/64 ,  A61C13/083

CPC classification number: A61C13/082 ,  A61C13/083 ,  C04B35/48 ,  C04B35/4885 ,  C04B35/64 ,  C04B2235/3217 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3246 ,  C04B2235/3272 ,  C04B2235/3275 ,  C04B2235/5409 ,  C04B2235/602 ,  C04B2235/656 ,  C04B2235/668 ,  C04B2235/725 ,  C04B2235/786 ,  C04B2235/9653 ,  C04B2235/9661

Abstract: A zirconia sintered body is provided having a color tone equivalent to the color tone guides of various natural teeth and having the same aesthetics as a natural front tooth. The present invention provides a colored translucent zirconia sintered body comprising zirconia containing greater than 4.0 mol % and not greater than 6.5 mol % of yttria, less than 0.25 mol % of erbia, less than 2,000 ppm of iron oxide in terms of Fe2O3, less than 0.01 wt. % of cobalt oxide in terms of CoO, and less than 0.1 wt. % of alumina; the zirconia sintered body having a relative density of not less than 99.90%, a total light transmittance of not less than 25% and less than 40% for light having a wavelength of 600 nm at a sample thickness of 1.0 mm, and a strength of not less than 500 MPa.

公开(公告)号：US20160310245A1

公开(公告)日：2016-10-27

申请号：US15104036

申请日：2014-12-19

Applicant: TOSOH CORPORATION

Inventor： Hiroyuki FUJISAKI ,  Kiyotaka KAWAMURA

IPC: A61C13/08 ,  A61C7/14 ,  A61K6/02 ,  C04B35/486 ,  C04B35/64 ,  A61C13/00 ,  A61C13/083

CPC classification number: A61C13/082 ,  A61C7/14 ,  A61C13/0022 ,  A61C13/083 ,  A61C2201/002 ,  A61K6/024 ,  C01G25/02 ,  C01P2002/50 ,  C01P2002/52 ,  C01P2002/70 ,  C01P2002/76 ,  C01P2004/61 ,  C01P2006/10 ,  C01P2006/12 ,  C04B35/486 ,  C04B35/62695 ,  C04B35/64 ,  C04B2235/3217 ,  C04B2235/3225 ,  C04B2235/5409 ,  C04B2235/549 ,  C04B2235/602 ,  C04B2235/608 ,  C04B2235/72 ,  C04B2235/77 ,  C04B2235/96 ,  C04B2235/9653

Abstract: To provide a zirconia sintered body having both excellent translucency and bending strength, specifically a zirconia sintered body having both translucency and strength suitable as a denture for front tooth, and a process for its production.A translucent zirconia sintered body containing more than 4.0 mol % and at most 6.5 mol % of yttria and less than 0.1 wt % of alumina, and having a relative density of at least 99.82%, a total light transmittance of at least 37% and less than 40% to light with a wavelength of 600 nm at a thickness of 1.0 mm, and a bending strength of at least 500 MPa, and a process for its production.

Abstract translation: 一种半透明的氧化锆烧结体，其含有大于4.0摩尔％且至多6.5摩尔％的氧化钇和小于0.1重量％的氧化铝，并且具有至少99.82％的相对密度，至少37％以下的总透光率 具有厚度为1.0mm，弯曲强度为至少500MPa的波长600nm的光的40％以上，以及其制造方法。