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Dentin-derived-barrier membrane (DDB). (A) DDB was fabricated from a 300 to 800 µm thick slice of autogenous tooth bone graft block with 0.2 to 0.3 mm diameter holes. (B) Scanning electronic microscopy (S-4700, Hitachi, Tokyo, Japan) of the DDB surface with exposed dentinal tubules (×1000 magnification).
