公开(公告)号：US20180303587A1

公开(公告)日：2018-10-25

申请号：US15770220

申请日：2016-10-25

Applicant: Tokuyama Dental Corporation

Inventor： Junichiro YAMAGAWA ,  Tomonao SHIMIZU ,  Yuko NAGASAWA

IPC: A61C13/00 ,  A61C13/08 ,  A61C13/09 ,  C08K3/36 ,  C08K3/22 ,  A61K6/04 ,  A61K6/06 ,  A61K6/087 ,  C08J5/00 ,  B29C45/00

CPC classification number: A61C13/0022 ,  A61C13/0004 ,  A61C13/081 ,  A61C13/087 ,  A61C13/09 ,  A61K6/027 ,  A61K6/046 ,  A61K6/0612 ,  A61K6/087 ,  B29C45/0001 ,  B29C45/0055 ,  B29K2101/12 ,  B29K2105/16 ,  B29L2031/7532 ,  C08J5/00 ,  C08J2371/10 ,  C08K3/00 ,  C08K3/22 ,  C08K3/36 ,  C08K2003/2241 ,  C08L101/00

Abstract: A resin block that can be favorably used for obtaining dental prosthetics through the milling work, containing very little voids, having excellent property for being cut, exhibiting excellent appearance and mechanical strength, and without permitting the formation of defective products. The resin block contains a thermoplastic resin having a fluidizing temperature in a range of 310 to 500° C. and inorganic particles in an amount of 30 to 150 parts by mass per 100 parts by mass of said thermoplastic resin. The inorganic particles are at least one kind of inorganic oxide particles selected from the group consisting of silica particles, silica composite particles of silica and other metal oxides, titania particles, and titania composite particles of titania and other metal oxides. The resin block has a thick portion of a thickness of at least not less than 5 mm, and does not contain any void whose length is not less than 1.0 mm.

公开(公告)号：US20190274931A1

公开(公告)日：2019-09-12

申请号：US16335069

申请日：2017-10-12

Applicant: TOKUYAMA DENTAL CORPORATION

Inventor： Junichiro YAMAGAWA ,  Tomonao SHIMIZU ,  Yuko NAGASAWA ,  Anna UEHARA

IPC: A61K6/087 ,  A61K6/027 ,  A61K6/04

Abstract: A dental resin composite material is provided that is reduced in darkness of its color tone, and also reduced in burning and color unevenness. Specifically provided are a dental resin composite material including 100 parts by mass of a polyaryletherketone resin, 10 parts by mass to 300 parts by mass of inorganic particles, and 90 ppm or less of an impurity having an aromatic ring, a method of producing the dental resin composite material, and a polyaryletherketone resin for producing a dental resin composite material, to be used for producing the dental resin composite material.

公开(公告)号：US20200253835A1

公开(公告)日：2020-08-13

申请号：US16647045

申请日：2018-09-14

Applicant: Tokuyama Dental Corporation

Inventor： Junichiro YAMAGAWA ,  Akiyoshi MORI ,  Yuko NAGASAWA ,  Takuya SUZUKI ,  Yohei SEYA

IPC: A61K6/887 ,  A61K6/84 ,  A61K6/833 ,  A61K6/836

Abstract: A dental curable composition which comprises a radically polymerizable monomer component (A), a polymerizing catalyst (B) and an inorganic granular material (C), characterized in that: the radically polymerizable monomer component (A) contains a bifunctional monomer (A-1) represented by the following formula (α), RP—SP1—RP   (α) where, RP is a radically polymerizable group represented by CH2═C(R)—COO— or CH2═C(R)—CONH—, wherein R is a hydrogen atom or a hydrocarbon group having 1 to 3 carbon atoms, and SP1 is a hydrocarbon group having 5 to 15 carbon atoms, and the content of the bifunctional monomer (A-1) in the radically polymerizable monomer component (A) is 5 to 40% by mass under a condition that the content of a diluting monomer (A-2) represented by the following formula (β), RP—SP2—RP   (β) where, RP is as defined in the above formula (α), and SP2 is an aliphatic hydrocarbon group different from. SP1, an oxygen-containing aliphatic hydrocarbon group having not less than 2 oxygen atoms, or an oxygen-containing aromatic hydrocarbon group having not less than 3 oxygen atoms, is zero or not more than 10% by mass.

公开(公告)号：US20250152316A1

公开(公告)日：2025-05-15

申请号：US18838840

申请日：2023-03-13

Applicant: TOKUYAMA DENTAL CORPORATION

Inventor： Yuko NAGASAWA ,  Shuntaro IIDA

IPC: A61C13/00 ,  A61C3/02

Abstract: A mill blank for dental cutting including a section to be cut that has a shape of a columnar body whose bottom surface and upper surface are in a substantially identical shape and that is formed of a hybrid resin, the section to be cut having a gradation structure in which color appearance changes in stages in a height direction, where the height direction is a direction from the bottom surface of the columnar body being a base end toward the upper surface which is a tip. In the gradation structure, a region having one color appearance forms each of “color units” into which the columnar body is divided in the height direction along a plane horizontal to the bottom surface and that each have a predetermined thickness, and five to nine “color units” different in the color appearance are continuously arranged in the height direction.

公开(公告)号：US20240335269A1

公开(公告)日：2024-10-10

申请号：US18294073

申请日：2022-08-22

Applicant: Tokuyama Dental Corporation

Inventor： Yuko NAGASAWA ,  Hidenori MIMAKI

IPC: A61C19/10 ,  A61C5/77

CPC classification number: A61C19/10 ,  A61C5/77

Abstract: [Object] Provided is a method of previously confirming an appearance color of a crown after mounted on an abutment tooth of a patient, the crown being manufactured by CAD/CAM using a milling block made of a non-metal material and having a specific surface color pattern.
[Solving Means] Using an instrument kit or demonstration instrument including a crown sample and an abutment tooth sample, the crown sample being manufactured by CAD/CAM using a milling block substantially identical to a milling block to be used for manufacturing the crown and including an open cavity, the abutment tooth sample including an abutment tooth portion having a shape and a size with which the abutment tooth portion can be freely inserted into the open cavity, and having a surface color pattern substantially identical to a color of an abutment tooth of a patient, an appearance color of the crown sample is confirmed before and after the abutment tooth portion is inserted into the open cavity.

公开(公告)号：US20220054241A1

公开(公告)日：2022-02-24

申请号：US17299307

申请日：2019-11-14

Applicant: TOKUYAMA DENTAL CORPORATION

Inventor： Yuko NAGASAWA ,  Masaaki USHIODA

IPC: A61C13/12 ,  A61C13/00

Abstract: Provided is a joining structure for processing which joins reliably and without misalignment a dental CAD/CAM block to be machined to a block holder for holding same onto a processing device. An engagement protrusion is formed on a block-side joint surface of a block to be processed, and an engagement recess is formed on a holder-side joint surface of a block holder. An adhesive retaining space is formed therebetween. An adhesive is applied thereto, and the engagement protrusion and the engagement recess are engaged and joined. The engagement protrusion formed on the block to be processed is rectangular or substantially rectangular. If the engagement protrusion extends from the front surface towards the back surface of the block to be processed, the protrusion can removed from a mold (shown in FIGS. 5A and 5B) by moving the protrusion in the direction of the arrow (shown in FIGS. 5A and 5B).

公开(公告)号：US20190282455A1

公开(公告)日：2019-09-19

申请号：US16463796

申请日：2017-11-28

Applicant: TOKUYAMA DENTAL CORPORATION

Inventor： Tomonao SHIMIZU ,  Junichiro YAMAGAWA ,  Yuko NAGASAWA

IPC: A61K6/087 ,  A61K6/00 ,  A61C5/77 ,  A61C13/20

Abstract: A polyaryletherketone resin material is provided for dental use having high color tone stability in the case of exposure to visible light. The polyaryletherketone resin material for dental use includes a polyaryletherketone resin, which is a thermoplastic resin containing at least an aromatic group, an ether group (ether bond), and a ketone group (ketone bond) in its structural unit, and having a b* value of 10.0 or more in terms of colorimetric value of a 1.0 mm molded body in a CIELab color system under a black background condition.