[Bending resistance and bending module of 2 photopolymerizing plastic filling materials]

Bending tests corresponding to the German Industrial Norm 13,922 for plastic filling material were carried out with ultraviolet polymerized Nuva-Fil P.A. and photopolymerized Fotofil. The photopolymerized Fotofil fulfilled the German Industrial Norm requirements: at least 50 N/mm2 bending impact strength after 24 hours. After longer periods of time, however, bending impact strength dropped below 50 N/mm2. The difference between Fotofil and other composites was obvious. The use of Fotofil together with increased bending module led to increased brittleness.