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(a) Bactericidal activities of PEEK and PEEK/nano-FHA composite samples against S. mutans cultured for different time points. (b) Live/dead cell staining of S. mutans cultured on PEEK (b1) and PEEK/nano-FHA (b2) for 14 days. ** represents p < 0.01. Reproduced from [164] with permission of Elsevier.
