Fig. (2) FEGSEM images on (A-F) glass-ionomer and (G,H) resin composites. (A-B) Commercial glass-ionomer and glass-ionomer reinforced with (C,D) alumina or (E,F) zirconia. Images obtained by (A,C,E,G) backscattered or (B,D,F,H) seconday electrons mode at 15 kV.