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.