低温プラズマによるFRS炭素人工歯根材の表面改質

抄録

Surface modification of an FRS carbon dental implant (FRS implant) with a fine Rahmen structure surface, was investigated in order to give wettability to the FRS implant surface. The wettability was given by oxidation of FRS implant surface only. The FRS implant was prepared by the deposition and infiltration of low temperature pyrolytic carbon (LTPC) from cis-1, 2-dichloroetylene. Surface oxidation onto the LTPC plate was carried out by several methods. The LTPC plate surface was not oxidized by reagent oxidation with hot concentrated nitric acid at 95°C. Then the LTPC plate surface was treated by electrolytic oxidation with phosphoric acid, which gave hydrophilic property. But micro-Vickers hardness of the LTPC plate surface decreased from 500 to 290kgf/mm², while the LTPC plate surface was found to be strongly etched by scanning electron microscopy. So surface oxidation by low temperature plasma of oxygen (13.56MHz, 25W, 10min) was carried out to the LTPC plate. This treatment modified the surface of LTPC plate to highly hydrophilic, and the hardness showed the same value before plasma treatment. Surface condition of the LTPC plate was not changed by this treatment. Accordingly the low temperature plasma treatment is regarded as the best modifying method for the FRS carbon dental implant.