SHOFU INC.

To provide a dental resin blank for cutting and machining which has excellent versatility and productivity and is imparted with high mechanical strength. To provide a dental resin blank for cutting and machining by the manufacturing method of a dental resin blank for cutting and machining, comprising step (1) of contacting at least one type of porous inorganic filler with a polymerizable monomer, step (2) of impregnating the porous inorganic filler with the polymerizable monomer to obtain a granular powder, and step (3) of placing the granular powder into a mold and applying pressure and heat to cure.

To provide a zirconia mill blank for dental cutting and machining that can significantly change the translucency of the sintered body while maintaining high strength by changing the sintering temperature. To provide a zirconia mill blank for dental cutting and machining, containing a stabilizer in an amount of 5.8 mol % or more and 7.0 mol % or less in terms of oxide, and substantially no alumina, wherein the zirconia mill blank for dental cutting and machining has a portion satisfying a condition that a crystal grain size of sintered body in the case of producing by sintering at 1550° C. for 1 hour is 2.0 times or more of a crystal grain size of sintered body in the case of producing by sintering at 1450° C. for 1 hour.

To provide a dental curable composition that can achieve high mechanical strength after curing. To provide a dental curable composition comprising a silane coupling material represented by formula (1) and/or an inorganic filler surface-treated with silane coupling material represented by formula (1).

To provide a dental porcelain composition that can be used for a dental prosthesis device, particularly a dental prosthesis device made of ceramics, glass-ceramics, or glass, does not require skilled techniques, suppresses dripping during technical work and a sink mark after firing, and exhibits excellent aesthetic property after firing and a manufacturing method thereof. To provide a dental porcelain composition comprising (A) glass and (B) organic solvent having a boiling point of 100 to 300° C., wherein the (A) glass includes (A-1) base material glass having a particle diameter D50 of 2 to 8 μm and (A-2) base material glass having a particle diameter D50 of 25 to 45 μm, and a particle diameter of the glass (A) satisfies D10≤5 μm, 5 μm<D50<28 μm, and 28 μm≤D90.

An object of the present invention is to provide a production method that can provide a dental polymerizable composition (β) or a dental polymerizable composition intermediate (γ), having excellent storage stability, in high yield. A method for producing a dental polymerizable composition (β) or a dental polymerizable composition intermediate (γ), which is substantially free of a filler, using a production machine that is substantially not equipped with a stirring blade and equipped with a container, the method comprising the steps of disposing an composition (α) comprising (a) a polymerizable monomer and (b) a polymerization inhibitor in the container such that an empty space rate of the container is 10 to 90%; and operating the container.

The problem to be solved by the present invention is to provide a filler that can be used to fabricate a dental composition with stable paste properties even after long-term storage, and to provide the dental composition. A dental composition including an (A) polymerizable monomer, a (B) polymerization initiator, and a (C) filler, characterized in that the (C) filler includes a (c2-1) filler having an average primary particle size of greater than 100 nm, surface-treated with a silane coupling agent, and when the (c2-1) filler having an average primary particle size of greater than 100 nm, surface-treated with a silane coupling agent, undergoes a thermogravimetric analysis under conditions of a heating rate of 10° C./min from 30° C. to 550° C. in a nitrogen atmosphere, a weight loss rate at 250° C. is 50% or less of a weight loss rate at 550° C.

To manufacture a dental zirconia pre-sintered body for cutting and machining with little warpage without limiting the powder composition to be stacked to specific coloring materials or stabilizers, and with no distortion after perfect sintering. In the step of forming a second or more layers, a zirconia powder for layering used in a green compact constituting each layer is different from a zirconia powder for layering used in a green compact constituting adjacent layer in relative density to the perfect sintered body in the green compact pressed at a press pressure of 4.78 kN/cm 2 , and each press pressure of the powder compacting in forming the green compact that constitutes each layer is adjusted so that the difference in relative density between the green compacts constituting respective layers is 2 or less, and in the step of pre-sintering, the multilayer zirconia green compact is pre-sintered at a temperature at which the processing coefficients of respective layers after pre-sintering are substantially equal.

To provide a dental composite resin kit which can reproduce a wide range of shades with a relatively small number of dental composite resins used in combination when performing aesthetic filling and restoration on teeth of various shades. To provide a dental composite resin kit including at least a first dental composite resin and a second dental composite resin, wherein a contrast ratio of a cured body measured at a thickness of 1 mm of the first dental composite resin is 0.3 to 0.75, a contrast ratio of a cured body measured at a thickness of 1 mm of the second dental composite resin is 0.3 to 0.75, a difference in contrast ratio of a cured body between the first dental composite resin and the second dental composite resin is 0.3 or less, and when it is defined that (L 1 *, a 1 *, b 1 *) is a value of a color tone in a cured body having a thickness of 1 mm of the first dental composite resin in the L*a*b* space measured in the white background and (L 2 *, a 2 *, b 2 *) is a value of a color tone in a cured body having a thickness of 1 mm of the second dental composite resin in the L*a*b* space measured in the white background, the color difference ΔE expressed by the following formula (1) is 2 or more. Δ ⁢ E = { ( L 1 * - L 2 * ) 2 + ( a 1 * - a 2 * ) 2 + ( b 1 * - b 2 * ) 2 } 1 / 2 Formula ⁢ ( 1 )

To provide a photopolymerizable type dental surface coating material composition which may finish the applied part lubriciously in a short time by exhibiting excellent surface curability regardless of the type of light irradiator, may protect the restoration from abrasion and stain for a long time by exhibiting excellent adhesive property to various restorations including the dental glass ionomer cement for filling and the tooth substance, and may have excellent storage stability that can maintain properties and characteristics for a long time. The photopolymerizable type dental surface coating composition of the present disclosure comprises (a) polyfunctional polymerizable monomer, (b) volatile monofunctional polymerizable monomer, (c) acidic group-containing polymerizable monomer, (d) α-diketone compound, (e-1) aromatic tertiary amine as (e) amine compound, and (e-2) aliphatic tertiary amine as (e) amine compound, wherein the compounding ratio of the (e-1) and the (e-2) is within a range of 1.0:99.0 to 70.0:30.0 in terms of mass ratio.

A composite material including silanated filler and mixed polymerizable monomer, having a stable pasty property which keeps well and has a consistent usability. A composite material containing a silanated filler, a polymerizable monomer, and a polymerization initiator, and may be produced by a process which includes a mixed polymerizable monomer preparing step, a silanation step, a silanated filler preserving step, a composite material preparing step, a composite material preserving step, a composite material filling step, and a small quantity preserving container preserving step.