Kuraray Noritake Dental Patente

Zusammenfassung wird geladen …

The present invention provides a zirconia pre-sintered body that can yield a zirconia sintered body with excellent mechanical strength and translucency, and a method for producing such a zirconia pre-sintered body. The present invention relates to a zirconia pre-sintered body comprising zirconia, and a stabilizer capable of preventing a phase transformation of zirconia, wherein the zirconia comprises monoclinic zirconia, and the width at half maximum of the main peak derived from the monoclinic zirconia in a powder X-ray diffraction pattern based on CuKα radiation is 0.18° or more.

The present invention provides a zirconia pre-sintered body that can achieve a relative density of 99.0% or more in fast firing with a high rate of temperature increase of 350°C/min, and yield a zirconia sintered body having excellent translucency. The present invention relates to a zirconia pre-sintered body comprising zirconia and yttria, wherein the zirconia pre-sintered body, with six target temperatures set from 1,150°C to 1,400°C at 50°C intervals and six samples prepared by heating the zirconia pre-sintered body from a temperature range of 400°C or less to each different target temperature at a rate of temperature increase of 350°C/min, followed by 10-minute retention at the target temperature and subsequent cooling to 25°C, has a transition point where the maximum value of the amount of change ((Δρ_n+1/ΔT) - (Δρ_n/ΔT)) between the rate of density change Δρ_n/ΔT in the nth interval and the rate of density change Δρ_n+1/ΔT in the (n+1)th interval becomes 0.010 or more in the temperature range of 1,200°C or more and 1,350°C or less, where Δρ_n represents a change in density of the pre-sintered body between the upper-limit temperature and the lower-limit temperature of the nth interval (n being an integer of 1 or greater), and ΔT represents a change in temperature as defined for the six samples in the temperature range of target temperatures from 1,150°C to 1,400°C divided into 50°C intervals.

The present invention provides a zirconia composition that can yield a zirconia sintered body with excellent mechanical strength while allowing its opalescence to be controlled within an appropriate range, and a method for producing such a zirconia composition. The present invention relates to a zirconia composition comprising: zirconia particles with a zirconia concentration of 80 mass% or more; and small particles with a stabilizer concentration of 10 to 50 mass%, wherein the small particles have a primary particle diameter smaller than the average primary particle diameter of the zirconia particles.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

It is possible to further reduce a risk of fracture of the blank portion while maintaining an appropriate adhesive strength between the blank portion and the holding portion. A mill blank assembly (10) includes a blank portion (20), a holding portion (30) that is configured to hold the blank portion (20), and an adhesive layer (40). The adhesive layer (40) is disposed between a first adhesion surface (21) and a second adhesion surface (33), which are respective adhesion surfaces of the blank portion (20) and the holding portion (30). The adhesive layer (40) bonds the blank portion (20) and the holding portion (30) together. The second adhesion surface (33) of the holding portion (30) includes an uneven structure (36) comprising a projection portion (34) and a recess portion (35), and the projection portion (34) and the recess portion (35) are configured not to mate with each other.

The present invention provides a mill blank assembly that exhibits excellent processing accuracy through mitigation of vibrations generated during processing with a CAD/CAM processing machine. The present invention relates to a mill blank assembly comprising a workpiece portion, a holding portion, and an adhesive composition, and satisfying the following conditions (1) and/or (2):(1) a cured product of the adhesive composition exhibits a loss factor tan δ of 0.70 or less at 20°C in an ultramicro indentation test (nanoindenter);(2) the ratio (X1/Y1) of peel adhesion strength (X1) to fracture strain (Y1) in a compressive-shear adhesion test of the workpiece portion and the holding portion at 20°C is 1,200 N/mm or less.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

A dental composition kit having a high mineral density restoration capability is provided, the dental composition kit including a liquid A and a liquid B, the liquid A containing a calcium ion (a1) and water (b1), the liquid B containing a compound (c) having an acidic group represented by the following formula (I): R¹-X_k Formula (I)in which in the formula (I), R¹ represents an organic group having 40 or less carbon atoms having or not having at least one (meth)acryloyloxy group; X represents an acidic group; and k represents an integer of 1 or 2, in which in the case where k represents 2, two acidic groups X are the same as or different from each other, a zinc ion (d1), and water (b2), containing substantially no crosslinking polymerizable monomer.

In order to provide a paste dispenser capable of determining a relative position between a syringe and an attachment member at a predetermined position, a paste dispenser includes an attachment member (M) that is detachably attached to a syringe (3) including discharge ports (51, 51'). The attachment member (M) includes a tubular external body (OM), into which the syringe (3) is inserted and which is rotatable about a central axis (CA), and an inside member (IM) that is disposed inside the external body (OM). The external body (OM) is fixed to the syringe (3) via an engagement structure configured to engage by insertion of the syringe (3) along the central axis (CA) and by rotation of the external body about the central axis (CA). The engagement structure includes at least three engagement pairs, each pair including an engaging portion (45) that is formed on the syringe (3) and an engaged portion (107) that is formed in the external body (OM) and engageable with the engaging portion (45). The at least three engagement pairs are aligned along a rotation direction of the external body (OM) and are non-point symmetrical about a central point on the central axis (CA) when viewed along the central axis (CA).

In order to provide a static mixer and a paste dispenser capable of adjusting the pushing force of a plunger while preventing bubbles from being mixed into a dental material to be discharged, with a simple structure, a static mixer (7) includes a plurality of paste passages (29, 29') that is arranged circumferentially about a central axis (CA) of a syringe (3) and extends in a longitudinal direction (X); an intermediate passage (31); and a mixing passage (33) that extends about the central axis (CA). An inner circumferential surface of each of the plurality of the paste passages (29, 29') includes a tapered portion in a distal surface (29C, 29C'). A tapered portion is formed in a tapered shape that approaches the central axis (CA) from an inflow hole (29A, 29A') toward an outflow hole (29B, 29B'). The inflow hole (29A, 29A') includes an opening area that is greater than that of the outflow hole (29B, 29B').

The present invention provides a dental polymerizable composition that exhibits excellent toughness and water resistance in the cured product while reducing leachables from the cured product. The present invention relates to a dental polymerizable composition that comprises a polyfunctional (meth)acrylic polymerizable compound (A), and a photopolymerization initiator (B) containing no phosphine oxide framework. Preferably, the photopolymerization initiator (B) containing no phosphine oxide framework comprises a Norrish Type II photopolymerization initiator. Preferably, the polyfunctional (meth)acrylic polymerizable compound (A) comprises a polyfunctional (meth)acrylic polymerizable compound (A)-I having a molecular weight of less than 1,000, and/or a polyfunctional (meth)acrylic polymerizable compound (A)-II having a molecular weight of 1,000 or more.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

The present invention provides a curable dental composition that exhibits adequate flowability to reduce lifting of prostheses during luting while achieving excellent removability of excess cement at the time of preliminary irradiation. The present invention relates to a curable dental composition comprising a polymerizable monomer (A), a filler (B), a polymerization initiator (C), a polymerization accelerator (D), and a rheology modifier (E), wherein: the polymerization initiator (C) comprises a photopolymerization initiator (C-1), the curable dental composition exhibits a viscosity V1 of 10,000 Pa·s or more and less than 20,000 Pa·s at an initial shear rate D1 (0.01 s<-1>) when measured for viscosity over a total time period of 3 minutes using a rotational rheometer, with 1 minute at shear rate D1 (0.01 s<-1>), followed by 1 minute at shear rate D2 (10 s<-1>), and then 1 minute at shear rate D1 again, the curable dental composition exhibits a viscosity V2 of 100 Pa·s or less at shear rate D2 (10 s<-1>), and the time T required for viscosity V3 to reach 10,000 Pa·s after the shear rate is switched from D2 back to D1 is less than 40 seconds from when the shear rate is switched from D2 to D1.

Zusammenfassung wird geladen …

The present invention provides a stereolithographic resin composition that exhibits excellent strength, toughness, water resistance, and impact resistance in the shaped article. The present invention relates to a stereolithographic resin composition comprising a polyfunctional (meth)acrylic polymerizable compound (A) with a molecular weight of less than 1,000, a polyfunctional (meth)acrylic polymerizable compound (B) with a molecular weight of 1,000 or more, a monofunctional (meth)acrylic polymerizable compound (C) that does not comprise a hydroxyl group and comprises a cyclic ether structure, and a photopolymerization initiator (D).

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …