[Bending resistance of composites after storage in water from 1 day to 3 months]

The resistance to bending of paste-paste composites decreases with one exception after prolonged storage in water. The UV-hardened artificial filling materials show no uniform picture in this respect. The bending module of three paste-paste composites is at its peak after 24 hours with values of 40 to 50 kN/mm2, and then drops to 1/3 of this value. The value of the bending module of photopolymerising composites lies considerably lower-between 4 and 13 kN/mm2.