[Mineralized collagen based composite for bone tissue engineering].
OBJECTIVE: To construct a mineralized collagen based composite by biomimetic synthesis for bone tissue engineering. METHODS: Using the molecular collagen as the template, the calcium phosphate is deposited on it to produce a mineralized collagen based composite, then is combined with minute amount of poly lactic acid (PLA), the three-dimensional scaffold composite is prepared by liquid phase separation. Using osteoblast culture technique, the biocompatibility of this biomaterial in vitro is detected by x-ray diffraction, SEM, TEM, fluoroscopy and CLSM. RESULTS: Both degree and the size of crystals in the composite are low, which are similar to that of nature bone. It possesses porous structure and the porosity of the composite is high. The typical fibrillar microstructure is self-assembled of the collagen and the nano-crystal hydroxyapatite (HA) in the composite, moreover, the x-ray diffraction graphic of HA crystal shows the [002]-oriented. CONCLUSIONS: The biomimetic three-dimensional composite can serve as one of the optimal scaffold material for bone tissue engineering both on structure and on property.