SHOFU INC.

[Problem] To provide a dental porcelain paste that can maintain a constant paste property even during long-term storage, and that hardly generates carbonization and bubbles during firing even in the case of containing organic components. [Solution] To provide a dental porcelain paste for preparing a dental prosthesis device, comprising (a) base material glass having an average particle diameter D50 of 1 to 20 μm, (b) hydrophobized fine particle silica having an average primary particle diameter of 1 to 50 nm, (c) organic solvent having a boiling point of 100 to 300° C., and (d) inorganic salt.

To provide a dental photocurable composition having good storage stability of a matrix containing a polymerizable monomer and a polymerization initiator, etc. and excellent mechanical strength of a dental photocurable composition comprising a mixture of the matrix and a filler. The dental photocurable composition of the present disclosure comprises a matrix containing (A) polymerizable monomer, (B) photosensitizer, (C) photoacid generator and (D) photopolymerization accelerator, and (E) filler, wherein, the dental photocurable composition comprises (A1) polymerizable monomer having an acidic group as the (A) polymerizable monomer, and the dental photocurable composition comprises (D1) tertiary aliphatic amine compound having Log P of 2 or more and pKa of 10 or less as the (D) photopolymerization accelerator.

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 C total , the difference ΔC total which is a difference between C total of each impregnating liquid is 5.0 or less.

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. Δ ⁢ SP ⁡ ( m ) = ❘ "\[LeftBracketingBar]" SP ⁡ ( m ) - SP ⁡ ( m + 1 ) ❘ "\[RightBracketingBar]" ⁢ ( m = 1 , 2 , … ⁢ n - 1 )

To provide a ceramic mill blank for dental cutting and machining in which cracks or chips are not caused on the outer edge of the ceramic mill blank even if attaching to and detaching from a dental milling machine are repeated and it is possible to machine the vicinity of the outer edge of the ceramic mill blank. To provide a ceramic mill blank for dental cutting and machining, wherein, the ceramic mill blank for dental cutting and machining comprises a ceramic portion to be cut and machined and one or more seal members, the ceramic portion consists of a ceramic material which is not finally sintered, the ceramic portion has an outer peripheral surface which is engageable with a holding tool, the one or more seal members are provided on the outer peripheral surface of the ceramic portion, and a length of the one or more seal members is 50% or more of a length in a circumferential direction of the outer peripheral surface provided with the one or more seal members.

To provide a compule or syringe tip that can discharge viscous material in an intended shape by reducing deformation of the viscous material during discharge, can prevent viscous material from adhering to unintended portion by reducing an amount of viscous material that adheres to a nozzle tip, and can reduce dripping of viscous material to improve the anti-dripping property of the viscous material. To provide a compule or syringe tip having a discharge structure for discharging viscous material from a discharge opening, wherein the discharge structure comprises a flow path that is formed around a virtual central line and allows the viscous material to move, and a tapered flow path formed between the flow path and the discharge opening, wherein a cross-sectional area of the tapered flow path gradually increases toward the discharge opening.

To provide a syringe tip that can prevent the syringe tip from unintentionally falling-off during filling and prevent viscous material from leaking out from gaps by securely attaching the syringe tip to a syringe and can provide excellent operability without obstructing a surgical field. To provide syringe tip to be attached to a tip of a syringe containing viscous material to discharge the viscous material, comprising a syringe engaging portion that engages with the syringe, a cylindrical portion having a hollow portion with a virtual center line at its center and held by a user in the case of engaging the syringe tip with the syringe, and a nozzle portion discharging the viscous material contained in the syringe, wherein in the case that the maximum length (mm) between both end portions of the cylindrical portion on a virtual straight line orthogonal to the virtual central line is defined as first length A, the virtual straight line orthogonal to the virtual central line and including both end portions of the cylindrical portion constituting the first length A is defined as first virtual straight line, and the length (mm) between both end portions of the cylindrical portion on a second virtual straight line orthogonal to the virtual central line and orthogonal to the first virtual straight line is defined as second length B, the first length A and the second length B satisfy the following relational expressions (1) to (3). First length A /Second length B ≥1.5  Relational expression (1): 13≥(First length A +Second length B )≥5  Relational expression (2): 5≥Second length B Relational expression (3):

[Problem] To provide a dental photocurable composition which has sufficient mechanical property and whose rheological property is not deactivated even after long-term storage. [Solution] The dental photocurable composition of the present disclosure comprises (A) polymerizable monomer, (B) photosensitizer, (D) photopolymerization accelerator and (E) filler, wherein, the dental photocurable composition comprises (D1) aliphatic tertiary amine compound represented by formula (1) as the (D) photopolymerization accelerator, and the dental photocurable composition comprises (E1) hydrophobized silica fine particle having an average diameter of primary particle of 1 to 40 nm as the (E) filler. (wherein R 1 represents a substituent consisting of three or more carbons having an electron-withdrawing group at α-carbon and/or β-carbon of an amine starting from N, R 2 represents a substituent consisting of three or more carbons which may have an electron-withdrawing group, R 3 represents a substituent consisting of one or more carbons which may have an electron-withdrawing group, and α-carbon of N in the formula (1) is not an electron-withdrawing group.)

[Problem] To provide a dental resin-reinforced glass ionomer cement kit which can exhibit high adhesive property to tooth substance by a simple procedure without complicated operations and contains a dental tooth surface treatment material composition and a dental resin-reinforced glass ionomer cement composition. [Solution] To provide a dental resin-reinforced glass ionomer cement kit comprising a dental tooth surface treatment material composition (i) and a dental resin-reinforced glass ionomer cement composition (ii), wherein the dental tooth surface treatment material composition (i) contains (A) water-soluble organic solvent: 20% by mass or more and 79% by mass or less. (B) water: 20% by mass or more and 79% by mass or less, and (C) polymerizable monomer having acid anhydride structure: 1% by mass or more and 30% by mass or less, and the dental resin-reinforced glass ionomer cement composition (ii) contains (D) acid-reactive glass powder, (B) water, (E′) polymer of acidic group-containing polymerizable monomer, (F) tri or more functional (meth)acrylamide-based polymerizable monomer, (G) hydroxyl group-containing (meth)acrylate-based polymerizable monomer, and (H) polymerization initiator.