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Scanning electron microscope images of nano-hydroxyapatite -silica-glass ionomer cement (nano-HA-silica-GIC) group after 24 h incubation. (a) Top of the mould (2500×); (b) top of nano-HA-silica-GIC (1000 × magnification); (c) top of nano- HA-silica-GIC (5000 × magnification)
