Fig. 4From: Surface hardness and flexural strength of dual-cured bulk-fill restorative materials after solvent storageSEM images of Surefil One (a and b), Activa (c and d), Filtek One (e and f) and Fuji II LC (g and h). The solid arrows indicate exposed filler particles, the dashed arrows denote voids created by particle displacement, and the asterisk indicates a void caused by air entrapmentBack to article page