Fig. 6From: Evaluating the bioactivity of a hydroxyapatite-incorporated polyetheretherketone biocompositeCell proliferation on different material surfaces after 1, 3, and 7 days: a relative absorbance of MC3T3-E1 cells and b proliferative tendency of MC3T3-E1 cells from day 1 to day 7. The absorbance values at day 3 and day 7 were normalized to those at day 1Back to article page