Fig. 1

ALP staining (a) and Alizarin red S staining (b) on day 14 of cell culture, and ALP staining (c) and Alizarin red S staining (d) on day 14 without cells culture. (i) Non-coated plain PEEK disk (control); (ii) lase-exposed without apatite coating PEEK disk; (iii) 6% HAP coated PEEK disk; (iv) 6% SrHAP-coated PEEK disk; (v) 6% SrSiP-coated PEEK disk; and (vi) 6% SrZnSiP-coated PEEK disk. ALP and Alizarin red S staining were more strongly positive on the apatite-coated PEEK disks than that on non-coated or laser-exposed without coating PEEK disks (a, b). On the PEEK disks without cells culture, ALP were not stained on all disks (c). Alizarin red S were not stained on non-coated or laser-exposed without coating PEEK disks without cells culture, but were positive on the apatite-coated PEEK disks (d)