Infection is still a major concern in bone implants, especially in the implants with porous structures. As silver shows superior and broad-spectrum antibacterial activity, porous silver-doped -tricalcium phosphate (-TCP) bioceramics are prepared with 5 and 10 nanometer silver. The bioceramics show similar porous macrostructure with pure -TCP bioceramic, except slightly color change. They have almost identical microstructure to its pure -TCP counterpart under field emission scanning electron microscope. Their physical, chemical, and mechanical properties were investigated with X-ray diffraction, Fourier transforming infrared spectrometer, and AG-5kN, and no significant difference has been found between silver-doped -TCP bioceramics and pure -TCP bioceramic. Bactericidal concentration of silver ions was detected in the solution soaked with the bioceramics. They can efficiently inhibit the growth of Staphylococcus epidermidis and Styphylococcus aureus, but show no cytotoxicity to L929 cells. It suggests that silver-doped -TCP bioceramics can be developed into new type of bone substitutes with anti-infection properties.
展开▼
