Fig. 7. qRT-PCR analysis of the mRNA levels of osteogenic genes. Relative gene expression of (a) Runx 2, (b) ALP, (c) COL I, (d) OCN and (e) OPN of the hFOB cells after 7 and 14 days of culture. Statistically significant differences between the different materials at the same time point (*P < 0.05, **P < 0.01, ***P < 0.001).