Unique cytological behavior of MC3T3-E1 osteoblasts on H₂O₂-modified C/C composites in vitro

MC3T3-E1 osteoblasts were cultured on H₂O₂-modified and unmodified carbon/carbon (H-C/C and C/C) composites for one week in order to evaluate differences in cell adhesion, spreading, and proliferation. The results indicated a certain degree of enhancement in the cell adhesion capability of osteoblasts cultured on H-C/C samples. Cellular morphologies after cell adhesion were observed via scanning electron microscopy (SEM), which showed that the cells adhered more closely and spread more widely on the H-C/C sample surface. However, no cell appeared in several multiple and continuous types of minor pores on both the C/C and H-C/C surfaces. In addition, two unique situations were observed on the H-C/C samples: an outline change of the osteoblasts was observed when the cells spread across some minor pores, and the cells entered and adhered well in some larger pores.