インプラントモデル材へのバイオセラミックスの傾斜機能溶射

抄録

The necessity to substitute the artificial part so called medical implant for broken or worn bone is growing as old people increase. Materials for implant should have both the same mechanical properties as original tissues and biocompatibility. However, it is difficult that a single material satisfies these requirements simultaneously. In this study, a hybrid implant material which was composed of surface material and substantial material was developed by plasma spraying technique. Powders of hydroxyapatite (HAp) and titanium were sprayed on the titanium substrate in such way that the composition of HAp was increased gradually toward the surface. The performance of obtained HAp coatings was investigated with SEM observation, X-ray diffraction, adherence test, friction test and dissolution test. It was found that hardness, adhesion strength and corrosion resistance were improved with increase in plasma energy and that they were much improved by YAG laser irradiation after spraying. However, sprayed coatings were inferior in hardness and corrosion resistance to the pig bone or sintered HAp because of porous structure. Therefore to produce medical implants by this method, biomimetic designing will be necessary.