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HR-SEM images at different magnifications showing the matrix deposition after 30 days of the in vitro study on (a) silicon nitride (as-fired), (b) Ti6Al4V (as-machined) and (c) PEEK (as-machined), (d) EDX mapping represents the matrix deposition on the as-fired Si3N4 surface, (e) graph indicates the RUNX2 gene expression on PEEK, Ti6Al4V and Si3N4 surfaces compared to glass coverslip as a control after 3 days of the in vitro study, with standard deviation bar
