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Surface microstructure of STF-exposed MTA (×2000). (A) Hexagonal, plate-like, and amorphous crystals are evident. (B) The crystals are covered by a poorly-crystalline superficial gel form structure in some area. (C) Small needle-like crystals are scattered between hexagonal and amorphous crystals in some areas. (D) Large needle-like crystals are evident in some areas.
