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SEM images of flake-shaped glass (FSG), FSG/composite resin (CR) (60 wt%), crushed silica filler (CSF)/CR (60 wt%), and a commercial CR clearfil-AP-X. The FSG is platelet-shaped with a flat surface and is smaller than 50 μm. The particle size of FSG is larger than that of the CSF and the filler contained in AP-X. Images from [100].
