A fracture-resistant denture base material is obtained from an auto-polymerising orcold-polymerising composition containing(A) a liquid monomer component；(B) a powder-shaped component, and(C) at least one initiator or one initiator system for auto- or cold-polymerisation,whereby at least one member of the groups of aliphatic urethane acrylates andaliphaticurethane methacrylates is present in (A) or/and (B)；whereby the fracture-resistant material shows, in particular, a fracturetoughness of >； 1.8MPa*m 1/2 and a fracture work of >； 400 J/m2 after curing, and, preferably alsoshows a differencein the yellow value, also called b value, of maximally one unit after 8 weeksof storage in fullydesalted water at 50°C. Preferably, no synthetic rubber is present.
