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1. 发明公开

EP4268794A1 CURABLE CALCIUM PHOSPHATE DENTAL CEMENT 审中-公开
公开(公告)号：EP4268794A1
公开(公告)日：2023-11-01
申请号：EP21915338.4
申请日：2021-12-28
申请人： Kuraray Noritake Dental Inc.
发明人： FUJIMAKI, Ryo
IPC分类号： A61K6/853 , A61K6/864
摘要： The present invention provides curable calcium phosphate dental cement that has excellent sealability for dentinal tubule, is expected to form fluoroapatite, and has a curing time that is advantageous for clinical use. The present invention is directed to curable calcium phosphate dental cement including: a first material as powder or nonaqueous paste; and a second material as liquid or aqueous paste, and, in the curable calcium phosphate dental cement, the first material comprises tetracalcium phosphate (A), alkali metal salt of phosphoric acid (B), and acidic calcium phosphate (C), the second material comprises water (D), and at least one of the first material and the second material comprises a fluorine compound (E) and an organic acid (F) having a molecular weight of 10000 or less.

2. 发明公开

EP4219425A1 METHOD FOR PRODUCING ZIRCONIA SINTERED COMPACT 审中-实审
公开(公告)号：EP4219425A1
公开(公告)日：2023-08-02
申请号：EP21872581.0
申请日：2021-09-24
申请人： Kuraray Noritake Dental Inc.
发明人： MATSUURA, Atsushi
IPC分类号： C04B35/486 , A61C5/70 , A61C13/083 , C04B35/64
摘要： The present invention provides a method of production of a zirconia sintered body by which a zirconia molded body or zirconia pre-sintered body having a plurality of layers containing different amounts of stabilizer is sintered in a short time period to produce a zirconia sintered body having hardly noticeable stripes between layers differing in yttria content. The present invention relates to a method for producing a zirconia sintered body, comprising a firing step of firing a zirconia molded body or a zirconia pre-sintered body,
the zirconia molded body or the zirconia pre-sintered body comprising a plurality of layers containing a stabilizer,
the plurality of layers including layers having different stabilizer contents,
the firing step comprising at least three stages of temperature-increasing process including a first temperature-increasing step (H1), a second temperature-increasing step (H2), and a third temperature-increasing step (H3),
the method satisfying HR2 = more than 0°C/min and less than 50°C/min, HR3 = 5 to 150°C/min, and HR3/HR2 > 1, where HR2 is a rate of temperature increase in H2, and HR3 is a rate of temperature increase in H3,
the temperature-increasing process having start temperatures that are 1,000°C or less in H1, more than 1,250°C and 1,450°C or less in H2, and 1,450°C or more and 1,550°C or less in H3,
the temperature-increasing process having end temperatures that are more than 1,250°C and 1,450°C or less in H1, 1,450°C or more and 1,550°C or less in H2, and 1,500°C or more and 1,750°C or less in H3.

3. 发明公开

EP4193985A1 COMPOSITION FOR DENTAL ATTACHMENT 审中-实审
公开(公告)号：EP4193985A1
公开(公告)日：2023-06-14
申请号：EP21853295.0
申请日：2021-08-06
申请人： Kuraray Noritake Dental Inc.
发明人： MATSUURA, Ryo , NOJIRI, Yamato
IPC分类号： A61K6/40 , A61C7/00
摘要： The present invention provides a composition for dental attachments that exhibits excellent adhesive properties to uncut enamel without carrying out a pretreatment with, for example, a dental adhesive after etching with phosphoric acid or the like, and that has more than a certain level of mechanical characteristics, and enables a simplified bonding procedure for dental attachments. The present invention relates to a composition for dental attachments that comprises a polymerizable monomer (A), a photopolymerization initiator (B), and a filler (C), the polymerizable monomer (A) comprising a polymerizable monomer (A-1) having an acidic group, and a polymerizable monomer (A-2) having no acidic group, the content of the polymerizable monomer (A-1) having an acidic group being 1 to 40 parts by mass in total 100 parts by mass of the polymerizable monomer (A), the content of the filler (C) being 50 to 90 parts by mass in total 100 parts by mass of the composition.

4. 发明公开

EP4082991A1 PRODUCTION METHOD FOR WORKABLE ZIRCONIA COMPOSITE SINTERED BODY, RAW MATERIAL COMPOSITION FOR WORKABLE ZIRCONIA COMPOSITE SINTERED BODY, AND WORKABLE ZIRCONIA COMPOSITE CALCINED BODY 审中-实审
公开(公告)号：EP4082991A1
公开(公告)日：2022-11-02
申请号：EP20905831.2
申请日：2020-12-25
申请人： Kuraray Noritake Dental Inc.
发明人： KATO Shinichiro , ITO Yoshihisa , NIWA Takahiro
IPC分类号： C04B35/488 , A61C5/70 , A61C13/08
摘要： The present invention provides a method that enables fabrication of a machinable zirconia composite sintered body that is machinable in a sintered state while maintaining properties suited for dental use, in a shorter time than it is possible with conventional methods. The present invention relates to a method for producing a machinable zirconia composite sintered body, comprising the steps of: fabricating a molded body with a raw material composition that comprises 78 to 95 mol% of ZrO 2 and 2.5 to 10 mol% of Y 2 O 3 , and 2 to 8 mol% of Nb 2 O 5 and/or 3 to 10 mol% of Ta 2 O 5 , and in which ZrO 2 predominantly comprises a monoclinic crystal system; and sintering the molded body.

5. 发明公开

EP4043002A1 DENTAL COMPOSITION 审中-实审
公开(公告)号：EP4043002A1
公开(公告)日：2022-08-17
申请号：EP20874394.8
申请日：2020-10-07
申请人： Kuraray Noritake Dental Inc.
发明人： MATSUURA, Ryo , KAJIKAWA, Tatsuya
IPC分类号： A61K6/887 , A61K6/30 , A61K6/60 , A61K6/893
摘要： An object of the present invention is to provide a dental composition that shows desirable adhesive properties to tooth structure, and that has desirable mechanical strength in the form of a cured product while having low polymerization shrinkage stress. The present invention relates to a dental composition comprising: a (meth)acrylic compound (A); a monomer (B) having an acidic group and a molecular weight of less than 5,000; a monomer (C) having no acidic group and having a molecular weight of less than 5,000; and a polymerization initiator (D), the (meth)acrylic compound (A) having an average molecular weight of 5,000 to 50,000, and an average molecular weight of 1,250 or more and less than 20,000 per (meth)acryl group.

6. 发明公开

EP4032522A1 CURABLE COMPOSITION FOR DENTISTRY 审中-实审
公开(公告)号：EP4032522A1
公开(公告)日：2022-07-27
申请号：EP20865424.4
申请日：2020-09-18
申请人： Kuraray Noritake Dental Inc.
发明人： KAJIKAWA, Tatsuya , HORIGUCHI, Hirotaka
IPC分类号： A61K6/884 , A61K6/889
摘要： The present invention provides a dental curable composition, suited for applications such as dental composite resins, having a small polymerization shrinkage stress and a consistency to easily fill cavities, and that, in the form of a cured product, has excellent mechanical strength with low water absorbency while causing reduced wear on opposing teeth. The present invention relates to a dental curable composition comprising a polymerizable monomer (A), a filler (B), and a polymerization initiator (C),
the polymerizable monomer (A) containing a polyfunctional (meth)acrylic monomer (A-1) having no aromatic ring but having a moiety (X) constituted by an alkoxylene repeating unit having 1 to 15 carbon atoms, and a polyfunctional (meth)acrylic monomer (A-2) having an aromatic ring but no hydroxyl group,
the moiety (X) having a C/O of 2.5 to 10 as a ratio of a total number of carbon atoms and a total number of oxygen atoms in the moiety (X),
the moiety (X) having a backbone with a total of 25 to 60 constituent carbon atoms and oxygen atoms altogether,
the polyfunctional (meth)acrylic monomer (A-1) being 3 to 60 parts by mass in 100 parts by mass of the polymerizable monomer (A).

7. 发明公开

EP4008699A1 METHOD FOR PRODUCING ZIRCONIA SINTERED COMPACT 审中-实审
公开(公告)号：EP4008699A1
公开(公告)日：2022-06-08
申请号：EP20848494.9
申请日：2020-07-31
申请人： Kuraray Noritake Dental Inc.
发明人： SAKAMOTO, Hiroyuki , KATO, Shinichiro , MATSUURA, Atsushi
IPC分类号： C04B35/486 , A61K6/818
摘要： The present invention provides a method that is for producing a zirconia sintered body and by which a zirconia molded body or a zirconia pre-sintered body is sintered in a short period of time, the zirconia sintered body reproducing an aesthetic requirement and strength of an ideal dental prosthesis at the same levels as those of a zirconia sintered body obtained by general firing. The present invention relates to a method for producing a zirconia sintered body, comprising a step of firing a zirconia molded body or a zirconia pre-sintered body, wherein: the firing step comprises at least three temperature increase steps including a first temperature increase step (H1), a second temperature increase step (H2), and a third temperature increase step (H3); a temperature increase rate in the first temperature increase step (H1) is defined as HR1, a temperature increase rate in the second temperature increase step (H2) is defined as HR2, and a temperature increase rate in the third temperature increase step (H3) is defined as HR3; HR1 = 50 to 500°C/min, HR2 = 11 to 300°C/min, HR3 = 10 to 299°C/min, HR1 > HR2, and HR2/HR3 > 1 are satisfied; starting temperatures in the temperature increase steps are room temperature to 500°C in H1, 900 to 1250°C in H2, and 1300 to 1550°C in H3; and reaching temperatures in the temperature increase steps are 900 to 1250°C in H1, 1300 to 1550°C in H2, and 1400 to 1650°C in H3.

8. 发明公开

EP3984497A1 MOUTHPIECE AND MOUTHPIECE MANUFACTURING METHOD 审中-实审
公开(公告)号：EP3984497A1
公开(公告)日：2022-04-20
申请号：EP20823495.5
申请日：2020-06-11
申请人： Kuraray Noritake Dental Inc.
发明人： ITO, Misaki , SUZUKI, Kenji
IPC分类号： A61C7/08
摘要： To provide a mouthpiece without a support trace and a method for manufacturing the mouthpiece. A method for manufacturing a mouthpiece (orthodontic aligner (20)), wherein the mouthpiece is to be placed within an oral cavity to cover teeth (10) and manufactured by an additive manufacturing device (30), the method including performing additive manufacturing for manufacturing a manufactured product (40) that comprises the mouthpiece (orthodontic aligner (20)), a peripheral portion (28) connected to the mouthpiece (orthodontic aligner (20)), and a support (26) configured to support the peripheral portion (28), and removing the peripheral portion (28) from the manufactured product (40).

9. 发明公开

EP3936490A1 ZIRCONIA SINTERED COMPACT HAVING HIGH LINEAR LIGHT TRANSMITTANCE 审中-实审
公开(公告)号：EP3936490A1
公开(公告)日：2022-01-12
申请号：EP20767379.9
申请日：2020-03-05
申请人： Kuraray Noritake Dental Inc.
发明人： KUDO, Yasutaka
IPC分类号： C04B35/486 , A61C5/77 , A61C13/083
摘要： The present invention provides a zirconia sintered body that excels in both translucency and strength and excels in linear light transmittance with no use of an HIP device, and a zirconia molded body and a zirconia pre-sintered body from which such a zirconia sintered body can be obtained. The present invention relates to a zirconia molded body comprising zirconia particles comprising 2.0 to 9.0 mol% yttria, having an average primary particle diameter of 60 nm or less, and including 0.5 mass% or less zirconia particles having a particle diameter of more than 100 nm, wherein the zirconia molded body has ΔL*(W - B) of 5 or more through a thickness of 1.5 mm. The present invention also relates to a zirconia pre-sintered body comprising 2.0 to 9.0 mol% yttria, wherein the zirconia pre-sintered body has ΔL*(W - B) of 5 or more through a thickness of 1.5 mm. The present invention further relates to a zirconia sintered body comprising: a fluorescent agent; and 2.0 to 9.0 mol% yttria, wherein the zirconia sintered body has a linear light transmittance of 1% or more through a thickness of 1.0 mm.

10. 发明公开

EP3925593A1 DENTAL MILL BLANK 审中-实审
公开(公告)号：EP3925593A1
公开(公告)日：2021-12-22
申请号：EP20755452.8
申请日：2020-02-13
申请人： Kuraray Noritake Dental Inc.
发明人： HORIGUCHI, Hirotaka , NISHIGAKI, Naoki
IPC分类号： A61K6/831 , A61K6/887 , A61C5/77 , A61L27/10 , A61L27/16 , A61L27/44 , A61L27/50
摘要： The present invention provides a dental mill blank having an excellent mechanical strength and an excellent water resistance according to which a decrease in mechanical strength can be suppressed even in an environment where water is present, for example, inside an oral cavity. The present invention relates to a dental mill blank including: a polymer (A); and continuous inorganic fibers (B) that are oriented substantially in one direction, wherein the dental mill blank has a decreasing rate of 40% or less in three-point flexural strength after immersion in 70°C water for seven days.

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