INCORPORATION OF FIBRONECTIN WITH CALCIUM PHOSPHATE FILM FOR IMPROVING IMPLANT FIXATION

Abstract

The fixation of titanium or titanium alloy implants is related to their surface composition and topography. Osteoconductive calcium phosphate coatings promote bone healing and apposition, leading to the rapid biological fixation of implants. It’s no doubt that the addition of certain biologically active protein with biomaterial will improve the bioactivity of the material. Previously, we examined the biocompatibility of basic fibroblast growth factor (bFGF) incorporation with titanium implants. Now we investigate the effect of fibronectin (FN) incorporation with thin calcium phosphate film deposited on titanium by electron-beam evaporation since fibronectin is actively involved in cell adhesion, spreading, would healing, cytoskeletal reorganization, and bone tissue formation. A FN-apatite composite layer was formed on the surface of titanium by biomimetic process. The coating process was carried out by immersing thin calcium phosphate film coated Ti in Dulbecco’s Phosphate buffered saline containing FN (20 ug/ml). The surfaces of samples were examined with FESEM, Fourier transform infrared spectroscopy and X-ray diffraction. The quantity of FN taken up and the kinetics of protein release were monitored by BCA method and Elisa. The fibronectin was immobilized in the newly formed apatite layer. The adhesion of osteoblast cells to the FN-apatite composite layer was to show the biocompatibility of implants, and FN-apatite composite layer could enhance osseintegration of implants in vivo.

This research was supported by a grant (code #: 08K1501-01220) from Center for Nanostructured Materials Technology under 21st Century Frontier R& D Program of the Ministry of Education, Science and Technology, Korea.