Surface Modification on Property of Mesoporous Calcium Magnesium Silicate/Polyetheretherketone Composites

Abstract

Mesoporous calcium magnesium silicate (m-MCS)/polyetheretherketone (PK) bioactive composites for bone repair were prepared, and the surfaces of composites were modified by sanding and sandblasting treatment. The surface roughness of the composites modified by sandblasting was Ra=4.552 while the surface roughness of the composites modified by sanding were 1.727 and 2.103, which were higher than that of the untreated composites (1.359). In addition, the water contact angle of the composites treated by sandblasting was 54.1° while the water contact angles of the composites modified by sanding were 76.3° and 71.6°, which were higher than that of the untreated composites (81.2°). The results indicated that surface roughness and hydrophilicity of composites were significantly enhanced by sandblasting treatment. Porous surface structure and a large number of mesoporous calcium magnesium silicates were exposed on the composites surfaces after sandblasting treatment, resulted in the maximum surface roughness and hydrophilicity. After immersed in simulated body fluid (SBF) solution for 7 d, massive apatites were formed on the composites surfaces, showing a good bioactivity. The in vitro cell experiments indicated that the surface modified composites could significantly promote adhesion, proliferation and differentiation of MC3T3-E1 cells on the surfaces. Therefore, sandblasting treatment could significantly improve the biological performances of the composites as compared with sanding treatment.