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H&E staining of remaining bone defects for the implantation of 4 weeks (A), (C), (E) and 8 weeks (B), (D), (F) after the implants were pulled out (n = 3). A, B: pure Ti; C, D: CaP/ Ti; E, F: CaP/gel/Ti. Some bone tissues were torn out by pulling out the implants and the big voids left (the black arrow).
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