Fig. 3

SEM/EDS analyses of PEEK surfaces after 14 days of cell culture. a SEM observation after cell culture on the disks: (i) non-coated PEEK, (ii) laser-exposed without coating PEEK, (iii) HAP-coated PEEK, (iv) SrHAP-coated PEEK, (v) SrSiP-coated PEEK and (vi) SrZnSiP-coated PEEK disks. The indicated area in the figure were analyzed, and (b) the elemental compositions are shown in the figures. The surfaces were covered with deposited calcium phosphate and extracellular matrix (ECM). Apatite underneath the deposits was slight detected by SEM (iii-vi), but clearly more detected than non-coated and laser-exposed without coating PEEK by EDS