Abstract: Disclosed herein is a soft, putty-like material for lining a denture base, comprising 100 parts by weight of a monomeric compound represented by the formula (I): ##STR1## wherein R.sup.1 represents a hydrogen atom or a methyl group and R.sup.2 represents a residual group formed by removing a hydroxyl group from a fluorine-containing telomer having a molecular weight of less than 1500, 3 to 30 parts by weight of a fluorine-containing copolymer, 3 to 30 parts by weight of a C.sub.1 to C.sub.12 -alkyl acrylate or methacrylate and 0.1 to 3.0 parts by weight of a polymerization-initiator.

Abstract: Disclosed herein are sheet for lining denture base prepared by molding a copolymer consisting of vinylidene fluoride units, tetrafluoroethylene units, hexafluoropropylene units and/or chlorotrifluoroethylene units in their mutual ratio within a predetermined range into shapes of sheets.

Abstract: An adhesive cementing agent is provided for the hard tissues of the human body, which contains a phosphoric or phosphonic acid ester compound containing at least one polymerizable functional group and either a group of the formula ##STR1## or a group of the formula ##STR2## or a high molecular weight compound obtainable by polymerizing the compound either alone or as a comonomer unit. This adhesive cementing agent has a high affinity for the tooth, bone and other hard tissues of the human body and enjoys prolonged stability in wet environments.

Abstract: A composite filler obtained by precuring the acrylate or methacrylate of a polyhydric alcohol having at least three ethylenically unsaturated groups in the molecule thereof by using a free-radical initiator in the presence of an inorganic filler, followed by grinding the resultant prepolymer is described. This composite filler remarkably improves the stiffness and hardness of organic resins and rubbers, and prevents a decrease in the impact strength and bending strength of organic resins and rubbers when the composite fillers are compounded into the organic resins and rubbers. Furthermore, a dental composition obtained from the polymerization of a vinyl compound in the presence of the above-mentioned composite filler is described. This dental composition has excellent properties, such as, high hardness, high strength, good adhesiveness, and is suitable for use as dental materials.

Abstract: The present invention relates to a copolymer for high refractive lens having a refractive index equal to or higher than 1.55, obtained by copolymerization of one or more of the first monomer component having the formula (I) ##STR1## wherein R.sub.1 signifies hydrogen atom or methyl radical, R.sub.2 signifies hydrogen atom or methyl radical, and m and n signify integers 0 to 4 in total, with one or more of the radically polymerizable second monomer component, homo-polymer of which has a refractive index equal to or higher than 1.55 and, if necessary, with the radically polymerizable third monomer component, the homo-polymer of which has a refractive index lower than 1.55 and to the lens prepared from said copolymer.

Abstract: A tooth cavity is filled by applying to the walls of the tooth cavity a lining composition comprising a phosphoric or phosphonic acid ester compound containing at least one radical polymizerable vinyl group and at least one ##STR1## group, wherein said lining composition contains said phosphoric or phosphonic acid ester compound in a proportion of not less than 0.1 weight percent, as phosphorus, and then filling the remainder of the cavity with a dental filling material which comprises a polymerizable monomer, a filler and a curing agent.

Abstract: A dental filling agent is provided, which contains a phosphoric or phosphonic acid ester compound containing at least one polymerizable functional group and either a group of the formula ##STR1## or a group of the formula ##STR2## or a high molecular weight compound obtainable by polymerizing the compound either alone or as a comonomer unit. This agent has a high bonding affinity for the tooth and enjoys prolonged stability in wet environments.

Abstract: A dental hydraulic investment comprising (A) an aqueous polyvinyl alcohol solution, (B) a water-soluble metallic compound, (C) a water-soluble, thermosetting resin precondensate and (D) a filler. Use of this investment allows formation of a desired denture by either a thermal polymerization or a room temperature polymerization method, and the denture thus obtained has excellent surface luster and is high in dimensional accuracy.

Abstract: A curable composition comprising an aromatic dibasic acid having an ethylenically unsaturated group, such as 4-methacryloxyethyltrimellitate, or an acid anhydride thereof, other ethylenically unsaturated monomer and a catalyst is disclosed. This composition is applied between articles to be bonded together and is polymerized and cured to form an adhesive layer excellent in the water resistance and durability. This composition is especially valuable as a dental adhesive or as an undercoating agent for a paint or adhesive.

Abstract: A soft contact lens having a water content of at least 45% and a tensile strength of at least 100 g/mm.sup.2 can be produced by pouring into a mold a composition consisting of 70 to 93% by weight of an alkylene glycol monoacrylate or monomethacrylate, 0.3 to 2.0% by weight of a polyfunctional monomer, 1 to 10% by weight of a monomer having at least one carboxyl group in its molecule and 5 to 20% by weight of an acrylic or methacrylic acid derivative, raising the temperature of the composition from 35.degree. C to 110.degree. C continuously to effect polymerization, processing the resulting formed product into a lens, and then swelling the lens thus obtained by hydration treatment including alkali treatment.