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HR-SEM images before and after 7 days in α-MEM of (a, b) as-fired Si3N4, (d, e) polished Si3N4, (g, h) PEEK, 600 grit, (j, k) PEEK, 2000 grit, (m, n) Ti6Al4V 600 grit and (p, q) Ti6Al4V 2000 grit. EDX spectra of (c) as-fired Si3N4, (f) polished Si3N4, (i) PEEK, 600 grit, (l) PEEK, 2000 grit, (o) Ti6Al4V 600 grit and (r) Ti6Al4V 2000 grit, after 7 days in α-MEM
