Abstract: Photopolymerizable composition, especially for dental purposes, which contains as photopolymerizable olefin compounds especially acrylic and/or methacrylic compounds as well as a ketone and an amine as activating substances. The amine has the general formula ##STR1## wherein the symbols have the following meanings: X represents cyan or halogen,R represents the group X--CH.sub.2 --CH.sub.2 -, an alkyl group of 1 to 6 carbon atoms, or a hydroxyl group of 2 to 6 carbon atoms, an acrylic, methacrylic or vinyl group, andR.sub.1 represents a substituted or unsubstituted phenyl, benzyl or styryl radical, orR and R.sub.1 together form an alkylene group of 4 to 5 carbon atoms, the amine being able to be present also in polymeric form if in the monomer R represents an acrylic, methacrylic or vinyl group and/or R.sub.1 represents the styryl radical.

Abstract: A synthetic dental composition for the production of a dental restorative structure, comprising at least one methacryl compound of which at least one is a polyfunctional methacrylate, and containing a catalyst, as well as dental restorative structures produced therefrom. The catalyst comprises at least one 2,2'-dialkylbenzopinacol wherein the optionally substituted alkyl group contains from 1 to 6 carbon atoms.

Abstract: Dental prosthetic devices, such as artificial teeth, crowns, bridges and replacements for parts of teeth are provided comprising hardened resin dental materials containing at least one polymer and a finely divided inorganic filler, said filler being present in an amount of about 10 to 90% based on the weight of the material and having a particle size within the range of 10 to 400 millimicrons, said materials having an extremely high compressive strength, clear opalescence and a very smooth homogeneous surface.

Abstract: Polymerizable dental materials are provided containing at least one polymerizable monomer and/or polymer and a finely divided inorganic filler, said filler being present in an amount of about 10 to 90% based on the weight of the material and having a particle size within the range of 10 to 400 m.mu., said material when polymerized having an extremely high compressive strength, excellent transparency and a very smooth homogeneous surface.

Abstract: A novel alloy comprising bismuth and tin which is characterized by the co-presence of silver and/or antimony. Particularly described is a dental alloy comprising:1. 30 to 74 weight percent bismuth2. 19 to 69.9 weight percent tin3. EitherA. Silver in an amount of 0.1 to 5 weight percent; orB. Antimony in an amount of 0.1 to 7 weight percent; orC. Silver and antimony in a combined amount of 0.1 to 7 weight percent, the proportion of silver being not more than about 5% by weight.