Fig. 4From: Does repeated autoclave sterilization cause changes in the color and fragility of fiberglass reinforced resin crowns?SEM images (1500 x) of crown surfaces in each group (a: control group, b: group 1, c: group 2). No fracture was observed on the crown surfaces in all groups. However, some crack/ slit lines could be clearly seen in group 1 and more in group 2Back to article page