Figure 1

Structure of a representative glass-ionomer cement (3 M Ketac Molar Easymix): 1—non-reacted glass core, 2—silicious hydrogel matrix-glass interphase, 3 – polysalt hydrogel matrix. Note that the glass cores differ in terms of radiopaque nanoparticles content. SEM BSE images, magnifications: 15,000× (A) and 65,000× (B).