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Microscopic observation 24 h after MC3T3-E1 cells were seeded onto the Ti- or Zir-discs. (A) Titanium-machined disc; (B) Titanium-anodized disc; (C) Sandblasted (Y, Nb)-TZP disc; (D) Sandblasted (Y, Ta)-TZP disc. Original magnification is 300× and bar = 100 μm.
