Abstract: [Problems] To fill a container with a material without applying a high pressure to the material that is to be filled. [Means for Solution] An ejection device 1 comprises a filling chamber 24 formed in a cylindrical member for containing a material to be filled, a discharge portion 7 having a discharge nozzle 12 for pouring out the filled material to the exterior, and a piston 4 that pushes the filled material toward the front end side of the filling chamber 24 to discharge the filled material through the discharge nozzle 12. In the ejection device 1, the discharge portion 7 is formed separately from the filling chamber 24 and in a manner to be fitted to an opening on one end side of the cylindrical member 24, the opening serving as a filling port for filling the material to be filled, and after the material to be filled is poured into the filling chamber 24 through the filling port, the discharge portion 7 is coupled to the filling chamber 24.

Abstract: Disclosed is an organic/inorganic composite filler that contains: inorganic agglomerated particles comprising agglomerations of inorganic primary particles having a mean diameter between 10 and 1000 nm; an organic resin phase that covers the surface of each inorganic primary particle and binds the inorganic primary particles to each other; and intra-agglomerate voids, formed between the organic resin phase covering the surface of each inorganic primary particle, with a pore volume (here, “pore” refers to holes with diameters between 1 and 500 nm) between 0.01 and 0.30 cm3/g as measured by mercury intrusion porosimetry. Also disclosed is a method for manufacturing the above organic/inorganic composite filler.

Abstract: In dental crown restoration, a dental shade guide which is selected to match patient's teeth comprises a shade-guide portion and a handle. A molding device for molding the dental shade guide comprises a molding plate having a shade-guide molding portion and a handle-holding groove. The molding plate is closed by a cover. While the handle is held in the handle-holding groove of the molding plate, dental composite resin paste is filled in the shade-guide molding portion and the upper surface of the molding plate is tightly pressed by the inner surface of the cover.

Abstract: Disclosed are photopolymerizable compositions suitable for uses such as dental composite resins, and that comprise (A) a radical-polymerizable monomer, (B) a photopolymerization initiator that comprises (B1) an ?-diketone compound, (B2) a photoacid generating agent, (B3) an aromatic amine compound, and (C) an organic filler containing a phthalate ester fluorescent agent.

Abstract: A photopolymerization initiator comprising (A) an ?-diketone compound such as camphorquinone, (B1) an aliphatic amine compound such as triethanolamine or N-methyldiethanolamine, (B2) an aromatic amine compound such as ethyl p-dimethylaminobenzoate or N,N-dimethyl p-toluidine, and (C) a triazine compound substituted with a trihalomethyl group, such as 2,4,6-tris(trichloromethyl)-s-triazine or 2-phenyl-4,6-bis(trichloromethyl)-s-triazine. The photopolymerization initiator remains stable against the environmental light such as the indoor illumination light from a fluorescent lamp or the dental light illuminating the interior of the oral cavity, is excellently handled, is quickly cured by the irradiation with an intense light emitted from a light irradiator for polymerization, provides a cured body having excellent properties, can be stably preserved even at high temperatures, and is very useful as a dental composite resin.

Abstract: A photopolymerization initiator comprising (A) an &agr;-diketone compound such as camphorquinone, (B1) an aliphatic amine compound such as triethanolamine or N-methyldiethanolamine, (B2) an aromatic amine compound such as ethyl p-dimethylaminobenzoate or N,N-dimethyl p-toluidine, and (C) a triazine compound substituted with a trihalomethyl group, such as 2,4,6-tris(trichloromethyl)-s-triazine or 2-phenyl-4,6-bis (trichloromethyl)-s-triazine. The photopolymerization initiator remains stable against the environmental light such as the indoor illumination light from a fluorescent lamp or the dental light illuminating the interior of the oral cavity, is excellently handled, is quickly cured by the irradiation with an intense light emitted from a light irradiator for polymerization, provides a cured body having excellent properties, can be stably preserved even at high temperatures, and is very useful as a dental composite resin.