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Scanning electron microscope images of nano- hydroxyapatite-silica-glass ionomer cement (nano-HA-silica-GIC) group after 72 h incubation. (a) Top of the mould (200×); (b) top of nano-HA-silica-GIC (1000 × magnification); (c) top of nano-HA-silica-GIC (2000 × magnification)
