Dental material which contains a urea derivative according to general formula I,in which R1 and R2 are in each case independently of each other an aliphatic C1-C15 radical which can be interrupted by —O—, —S—, —CO—O—； X is a radically polymerizable group； Y is a radically polymerizable group or an acid group； n, m are in each case independently of each other 1, 2, or 3.
