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SEM micrographs of fractured surfaces of the Bis-GMA/TEGDMA composite reinforced with (A) 5 wt% SiO2 nanoparticles and 60 wt% microparticles;(B) 5 wt% SiO2 nanofibers and 60 wt% microparticles;(C) 10 wt% SiO2 nanoparticles and 60 wt% microparticles; and (D) 10 wt% SiO2 nanofibers and 60 wt% microparticles. Images from [24].
