Abstract: The present invention provides a dental curable composition that enables a highly aesthetic restoration that blends in so well with the surroundings that it is almost indistinguishable from natural teeth, and that, despite being a single dental curable composition, shows good color compatibility with natural teeth over a wide range of shades, particularly in cases involving cavity floors in different classes of cavities, such as Class I, Class II, and Class V The present invention relates to a dental curable composition comprising a polymerizable monomer (A), a filler (B), a polymerization initiator (C), and a colorant (D), wherein the ratios R650/600, R700/600, and R750/600 of spectral reflectances at 650 nm, 700 nm, and 750 nm wavelengths to a spectral reflectance at 600 nm wavelength all fall within a range of 97% to 103% when measured for a 1.0 mm-thick cured product of the dental curable composition against a white background with a spectral colorimeter.

Abstract: A dental restoration material composition includes a (meth)acrylic acid ester compound (A) having two or more (meth)acryloyloxy groups per molecule, a mono(meth)acrylic acid ester compound (B), a polymerization initiator (C), and an organic-inorganic composite filler (D). The mono(meth)acrylic acid ester compound (B) includes at least one selected from the group consisting of a mono(meth)acrylic acid ester compound (B-1) represented by formula (I), and a mono(meth)acrylic acid ester compound (B-2) represented by formula (II). R1 and R2 are each independently a group represented by formula (i) or a group represented by formula (ii), and X is a divalent hydrocarbon group having 1 to 6 carbon atoms, or an oxygen atom.

Abstract: A dental curable composition includes a polymerizable monomer (A), a filler (B), and a polymerization initiator (C). The polymerizable monomer (A) contains 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) has a C/O of 2.5 to 10 as a ratio of a total number of carbon atoms to a total number of oxygen atoms in the moiety (X). The moiety (X) has a backbone with a total of 25 to 60 constituent carbon atoms and oxygen atoms altogether. A content of the polyfunctional (meth)acrylic monomer (A-1) is 3 to 60 parts by mass in 100 parts by mass of the polymerizable monomer (A).

Abstract: A dental restorative curable compositions may have a high mechanical strength and excellent water resistance and polishability in the form of a cured product. A dental composite resin may include such compositions. A dental mill blank may include the cured product of such compositions. A dental restorative curable composition may include: a (meth)acrylic acid ester compound (A) having two or more (meth)acryloyloxy groups per molecule; a mono(meth)acrylic acid ester compound (B); an inorganic filler (C) having an average primary particle diameter of 0.01 to 5 ?m; and a polymerization initiator (D).

Abstract: A dental composition may be suitable for use as a dental composite resin or other dental material, have good ease of handling, and be highly stable in consistency and low in polymerization shrinkage stress while providing desirable mechanical strength and polishability for the cured product. A dental composition may include a polymerizable monomer (A), an inorganic filler (B), a prepolymer (C), and a polymerization initiator (D), the inorganic filler (B) having an average particle diameter of 1 to 20 ?m, and a specific surface area of 10 to 300 m2/g. The prepolymer (C) preferably has a structure derived from the polyfunctional monomer (a). The polyfunctional monomer (a) has a molecular weight of preferably 250 to 1,000.

Abstract: 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.

Abstract: A dental composition may have good handling properties and low polymerization shrinkage stress, and be capable of producing a cured product having desirable mechanical strength and excellent transparency. A dental composition may include a polymerizable monomer (A), a filler (B), and a polymerization initiator (C), wherein the polymerizable monomer (A) includes a polyfunctional (meth)acrylic monomer (a-1) having an aromatic ring but no hydroxyl group, and a polyfunctional (meth)acrylic monomer (a-2) having an alicyclic skeleton, and the polyfunctional (meth)acrylic monomer (a-1) and the polyfunctional (meth)acrylic monomer (a-2) have a mass ratio (a-1)/(a-2) of 30/70 to 95/5.

Abstract: A dispenser can prevent leakage of contents from a nozzle tip when stopping discharging the contents. A dispenser includes: a syringe body that has a filled space of contents, and has a discharge hole at a tip thereof; a plunger that is slid in the syringe body by application of a pushing force, to discharge the contents in the filled space from the discharge hole; and a piston that is formed of an elastic material and located at a tip part of the plunger, wherein a gap is formed between an inner peripheral surface of the syringe body and an outer peripheral surface of the piston, when the plunger is pushed, the piston deforms to narrow the gap, and a back leakage risk (=(gap area/final discharge hole area)) after the deformation of the piston is 0 or more and less than 1.

Abstract: A synchromesh mechanism includes a shaft, a shift sleeve, a first gear and a second gear arranged at the both sides of a hub, and a first synchronizer ring and a second synchronizer ring arranged at the both side of the hub. The shift sleeve has a length so that it can start contacting with the first synchronizer ring and the second synchronizer ring at the same time.

Abstract: A transmission includes a first power transmitting path of gears that obtains odd number speeds and has an output part, a second power transmitting path of gears that obtains even number speeds and has an output part; a first gear shifting part incorporated in the first power transmitting path to obtain one of the odd number speeds, a second gear shafting part incorporated in the second power transmitting path to obtain one of the even number speeds, and a path shifting part that is arranged between the first and second power transmitting parts. The path shifting part shifts the first second power transmitting paths to output power to the output shaft.

Abstract: A dispenser can prevent leakage of contents from a nozzle tip when stopping discharging the contents. A dispenser includes: a syringe body that has a filled space of contents, and has a discharge hole at a tip thereof; a plunger that is slid in the syringe body by application of a pushing force, to discharge the contents in the filled space from the discharge hole; and a piston that is formed of an elastic material and located at a tip part of the plunger, wherein a gap is formed between an inner peripheral surface of the syringe body and an outer peripheral surface of the piston, when the plunger is pushed, the piston deforms to narrow the gap, and a back leakage risk (=(gap area/final discharge hole area)) after the deformation of the piston is 0 or more and less than 1.

Abstract: A transmission includes a first power transmitting path of gears that obtains odd number speeds and has an output part, a second power transmitting path of gears that obtains even number speeds and has an output part; a first gear shifting part incorporated in the first power transmitting path to obtain one of the odd number speeds, a second gear shafting part incorporated in the second power transmitting path to obtain one of the even number speeds, and a path shifting part that is arranged between the first and second power transmitting parts. The path shifting part shifts the first second power transmitting paths to output power to the output shaft.

Abstract: A synchromesh mechanism includes a shaft, a shift sleeve, a first gear and a second gear arranged at the both sides of a hub, and a first synchronizer ring and a second synchronizer ring arranged at the both side of the hub. The shift sleeve has a length so that it can start contacting with the first synchronizer ring and the second synchronizer ring at the same time.

Abstract: A yarn for air bags including polyamide multifilament with a total fineness of 200 to 700 dtex, a single fiber fineness of 1 to 2 dtex, strength of 7 to 10 cN/dtex, and elongation of 20 to 30%.

Abstract: An air bag fabric includes a warp and a weft, each including polyamide multifilaments with a total fineness of 200 to 700 dtex and a single fiber fineness of 1 to 2 dtex and having a cover factor (CF) of 1,800 to 2,300, wherein a ratio ECw/Mtw between edgecomb resistance, EDw, and single fiber fineness, Mtw, in the warp direction, and a ratio ECf/Mtf between edgecomb resistance, ECf, and single fiber fineness, Mtf, in the weft direction are both in a range of 250 to 1,000 N/dtex.

Abstract: An air bag fabric includes a warp and a weft, each including polyamide multifilaments with a total fineness of 200 to 700 dtex and a single fiber fineness of 1 to 2 dtex and having a cover factor (CF) of 1,800 to 2,300, wherein a ratio ECw/Mtw between edgecomb resistance, EDw, and single fiber fineness, Mtw, in the warp direction, and a ratio ECf/Mtf between edgecomb resistance, ECf, and single fiber fineness, Mtf, in the weft direction are both in a range of 250 to 1,000 N/dtex.

Abstract: A polyphenylene sulfide fiber has a large single-filament fineness, does not require special production equipment and serves as industrial material for uses where high rigidity is needed. A low-cost process produces the polyphenylene sulfide fiber with high spinnability. A polyphenylene sulfide fiber has a single-filament fineness of 10 to 50 dtex and a tenacity of 4.5 to 6 cN/dtex and the method attaches an aqueous lubricant to the surface up to 0.1 to 1 wt % and subsequently attaches a anhydrous lubricant to the surface so that the total weight of the surface-attached oil will accounts for 0.5 to 2 wt %.