Abstract: To provide a dental glass ionomer cement for a sealer to be used for sealing a gap between a gutta-percha point filled in a root canal in a dental root canal treatment and a root canal wall, with a prolonged setting time and with sufficient setting property even in a root canal having much water content, the dental cement for a sealer includes a polymer of ?-? unsaturated carboxylic acid, oxide powder capable of reacting with the polymer of ?-? unsaturated carboxylic acid, and water, and further includes an organic acid salt of metal selected from Mg, Ca, and Sr and/or a hydroxide of metal selected from Mg, Ca, and Sr.

Abstract: To provide initiators in two components having no discoloring after polymerization and excellent polymerization-curability under the existence of water, and provide a polymerizable composition using the initiators in two components. The initiators in two components is for polymerizing and curing a (meth)acrylate compound, and the initiator includes (a) a peroxide being compatible or soluble with water, (b) an aromatic sulfinic acid compound, (c) a tert-amine compound, and (d) water. The polymerizable composition uses the initiators in two components. Particularly, preferably, the polymerizable composition includes a first component and a second component. The first component comprising (a) a peroxide being compatible or soluble with water, and a (meth)acrylate compound, and the second component includes (b) an aromatic sulfinic acid compound, (c) a tert-amine compound, and (d) water.

Abstract: To provide a dental glass ionomer cement for a sealer to be used for sealing a gap between a gutta-percha point filled in a root canal in a dental root canal treatment and a root canal wall, with a prolonged setting time and with sufficient setting property even in a root canal having much water content, the dental cement for a sealer includes a polymer of ?-? unsaturated carboxylic acid, oxide powder capable of reacting with the polymer of ?-? unsaturated carboxylic acid, and water, and further includes an organic acid salt of metal selected from Mg, Ca, and Sr and/or a hydroxide of metal selected from Mg, Ca, and Sr.

Abstract: In order to decrease hydroscopic expansion of a resin-modified dental glass ionomer cement without losing high mechanical strength and adhesiveness to tooth structure and to lower a solubility, a dental cement consists of a liquid agent which includes a (meth)acrylate monomer having an acid group; a (meth)acrylate monomer having two or less hydroxyl groups and/or amino groups, not having an acid group, and having 160 or more molecular weight; water if necessary; and an amine compound as a polymerization initiator for a polymerization catalyst in a powder agent, and a powder agent which includes metal oxide powder used for fluoroaluminosilicate glass powder, dental zinc phosphate cement powder or dental carboxylate cement powder; and an organic aromatic compound and a peroxide, where the organic aromatic compound contains at least one —SO2— group as a polymerization catalyst.

Abstract: A dental cement comprises a first paste including a (meth)acrylate monomer having an acid group, the (meth)acrylate monomer not having an acid group, having two or less of hydroxyl groups and/or amino groups and having a molecular weight of 160 or more, the filler having a specific average particle size and being inactive to the (meth)acrylate monomer having an acid group, and the amine compound as a accelerator for the undermentioned polymerizing catalyst; and the second paste including a (meth)acrylate monomer not having an acid group, having two or less of hydroxyl groups and/or amino groups and having a molecular weight of 160 or more, a filler having a specific particle size, and an organic aromatic compound having at least one —SO2— group and the peroxide as a polymerizing catalyst, thereby providing a dental cement large flexural strength, adhesiveness to dentin, small hygroscopic expansion, and low solubility.

Abstract: To give high mechanical strength, particularly compression strength, and excellent operationality in a two-paste system, a dental paste glass ionomer cement composition comprises a first paste comprising an ?-? unsaturated carboxylic acid polymer, a filler that is not reacted with the ?-? unsaturated carboxylic acid polymer and is not in a monodisperse state in water, a silica aqueous sol containing colloidal silica having an average particle diameter of 1 to 100 nm dispersed in a monodisperse state in water to an SiO2 concentration of 1 to 50% by weight, and water, in prescribed amounts respectively, and a second paste containing fluoroalumino silicate glass powder in a prescribed amount, where the second paste sometimes contains a thickening agent comprising a water soluble polymer material and water, or a polymerizable monomer having no acid group.

Abstract: To separate a catalyst for polymerizing a monomer contained in a liquid or paste dental composition containing at least a monomer, such as a dental resin cement, an autopolymerizing dental resin or a resin-reinforced dental glass ionomer cement, from the liquid or paste dental composition to thereby improve storage stability of the dental composition and reduce number of division of the dental composition, an extrusion nozzle for a dental composition mounted on one end of an extruder for extruding a liquid or paste dental composition containing at least a monomer, the extrusion nozzle contains a catalyst for polymerizing the monomer contained in the dental composition during extrusion, and the catalyst is attached to an inner wall of an extruding channel of the extrusion nozzle.

Abstract: A dental cement composition is disclosed, comprising a liquid material and a powder material, wherein said liquid material comprises 4-methacryloxyethyl trimellitic acid and water, said powder material comprising a powdered fluoroalumino silicate glass or a powdered metal oxide containing zinc oxide as the major component, the dental cement composition of the invention has a superior adhesive strength and adhesive durability to the tooth structure and superior in mechanical strengths, particularly in bending strength, without using dental adhesives requiring the surface treatment or priming.

Abstract: A paste-type dental glass ionomer cement composition is disclosed as comprising a first paste comprising an &agr;-&bgr; unsaturated carboxylic acid polymer, water, and a filler not reactive with the &agr;-&bgr; unsaturated carboxylic acid polymer; and a second paste comprising a fluoroaluminosilicate glass powder and a polymerizable monomer free of an acid group, wherein at least one of the first paste and the second paste contains a polymerization catalyst. By employing a construction such that a dental glass ionomer cement composition comprising a powder component and a liquid component is made pasty, the invention makes it possible to achieve the mixing by a easy operation, whereby both of the first paste and the second paste are mixed with each other to achieve curing of the composition.