Abstract: Crosslinked polymeric particles obtainable by copolymerization, in the presence of a chain transfer reagent, of at least one difunctional radically polymerizable monomer, optionally at least one monofunctional radically polymerizable monomer and at least one thiourea derivative according to the following Formula (I): in which R is an (n+1)-valent, aromatic, aliphatic, linear or branched C1-C50 hydrocarbon radical, which can be interrupted by one or more, preferably 1 to 8, particularly preferably 1 to 6, ether, thioether, ester, amide or urethane groups; PG is a radically polymerizable (meth)acrylate, (meth)acrylamide or vinyl group and n is 1 or 2. In combination with a hydroperoxide, the crosslinked polymeric particles are suitable as redox initiator system for the free-radical polymerization of compositions comprising at least one radically polymerizable monomer. These compositions are particularly suitable as dental materials.

Abstract: A cationic polymer dispersion including at least one copolymer, water, at least one surfactant, and 0.3 to 3.0 wt. % of at least one organic and/or inorganic fluoride source, which is essentially free from low-boiling organic solvents. The dispersion is suitable as a varnish or coating for the fluoridation of teeth and for the treatment of prophylaxis of caries.

Abstract: A cationic polymer dispersion including at least one copolymer, water and at least one surfactant. The dispersion includes at least one antimicrobial agent and is essentially free from low-boiling organic solvents. The dispersion is suitable as an antimicrobial dental varnish or coating.

Abstract: Acylthiourea oligomers according to the formula The acylthiourea oligomers, in combination with a hydroperoxide compound, are active as initiators for the radical polymerization. Radically polymerizable compositions comprising at least one acylthiourea, at least one hydroperoxide and at least one radically polymerizable monomer are particularly suitable as dental materials.

Abstract: Radically polymerizable dental material, which includes a catalyst paste and a base paste, wherein the catalyst pastes includes an oxidizing agent, preferably a peroxide or hydroperoxide, a radically polymerizable monomer and/or oligomer with acid group and a polyfunctional radically polymerizable monomer, and the base paste comprises a polyfunctional radically polymerizable monomer without an acid group and a dihydropyridine derivative of Formula (1) The material has good mechanical properties and does not exhibit a bitter taste.