Elastic metallic-plastic pads（EMP） were irradiated by low energy aluminum ion in a metal vapor vacuum arc（MEVVA） 80-10 implantation system. The samples were irradiated with 20keV Al ion with the influx from 1...Elastic metallic-plastic pads（EMP） were irradiated by low energy aluminum ion in a metal vapor vacuum arc（MEVVA） 80-10 implantation system. The samples were irradiated with 20keV Al ion with the influx from 1×1015 to 1×1016 Al/cm2. Then the as-irradiated samples were measured by ESCA, XRD, AFM/FFM and a nano-probe. It is found that the hardness of as-irradiated samples is 5-6 times as that of the pristine ones. The worn depth of sample implanted at ion influx of 1×1016 Al/cm2 is about one eighth of that of the pristine sample at the same load. The XRD results show that there are some Al2O3 and AlF3 intermingled with the phase of polytetrafluoroethylene（PTFE）. The experimental results reveal that the tribological properties of EMP can be significantly improved by the ion beam surface modification.展开更多
文摘Elastic metallic-plastic pads（EMP） were irradiated by low energy aluminum ion in a metal vapor vacuum arc（MEVVA） 80-10 implantation system. The samples were irradiated with 20keV Al ion with the influx from 1×1015 to 1×1016 Al/cm2. Then the as-irradiated samples were measured by ESCA, XRD, AFM/FFM and a nano-probe. It is found that the hardness of as-irradiated samples is 5-6 times as that of the pristine ones. The worn depth of sample implanted at ion influx of 1×1016 Al/cm2 is about one eighth of that of the pristine sample at the same load. The XRD results show that there are some Al2O3 and AlF3 intermingled with the phase of polytetrafluoroethylene（PTFE）. The experimental results reveal that the tribological properties of EMP can be significantly improved by the ion beam surface modification.
文摘目的荧光标记法观察比较4种表面处理方式种植体周围骨矿化沉积率的差异。方法微创拔除4只Beagle犬双侧下颌4颗前磨牙,待拔牙创愈合3个月后,植入奥齿泰种植体40颗,其中机械形态表面(ma-chined morphology,MM)组4颗,喷砂加酸蚀(sand blasted with alumina and acid etched,SA)组、可吸收性研磨介质(resorbable blasting media,RBM)组和生物化学喷砂酸蚀组(biochemistry sand blasted with alumina and acid etched,Bio-SA)组各12颗,愈合3个月,处死前13、14 d和3、4 d分别注射盐酸四环素和钙黄绿素,制取标本并置于70%酒精固定,采用塑料包埋技术制作骨磨片,荧光显微镜下观察,测量骨矿化沉积率。结果螺纹间及远离螺纹区域新骨矿化沉积率在4组间的差异均没有统计学意义(P>0.05);单独比较每组种植体螺纹间及远离区域骨矿化沉积率的差异性,RBM组及SA组组内差异没有统计学意义(P>0.05),而MM组和Bio-SA组组内差异具有统计学意义(P<0.05)。结论采用塑料包埋技术,通过荧光标记法能成功观察到新骨矿化沉积的情况;种植体植入3个月后,4种不同粗糙程度的种植体螺纹间及远离螺纹区域骨矿化沉积率没有差异性,而经机械形态表面处理的种植体和生物化学喷砂酸蚀处理的种植体,螺纹间骨矿化沉积比远离螺纹区域快。
