Swelling tests of photocured materials were performed according to EN ISO:175. Discs (1.6 cm in diameter) were placed in chlorobenzene for 24 h at 40 °C. After that time, samples in closed laboratory glass vessels were removed from the incubator and left for 20 min at room temperature to cool down (15-30 min). The discs were then washed with THF, dried with filter paper, and weighed. The weighing after removal from the solvent took no longer than 30 s. The swelling ratio was calculated according to Equation 3, where m s indicates for swollen mass and m d is dry mass of the sample.