陽極酸化と水熱処理で形成されるチタン表面のアパタイト皮膜に対する酸化電圧の影響

概要

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Excellent biocompatibility has been reported for the titanium implants with modified surface by deposition of hydroxyapatite crystal though the combined treatments of anodic oxidation and hydrothermal heating (SA treatment). The purpose of this study was to determine an optimal voltage load in the anodic oxidation process for preparing an oxidized surface appropriate to the desired modification. Tensile adhesion tests of anodically oxidized titanium rod at voltages of 200-400 V were performed when it was bonded to a non oxidized titanium rod with the epoxy resin adhesive. Further the push-out tests of the implant-bone specimens excised from the femur of rabbits after embedding the titanium implant for 4 weeks were conducted with the tensile testing machine. The fractured surfaces were observed by scanning electron microscope (SEM). As a result, below 350 V oxidation brought about the tensile bond strength of 37 MPa without any delamination of the SA film, whereas 400 V oxidation decreased the strength to 32 MPa. The push-out test and SEM observation revealed that increase in the quantity of hydroxyapatite crystal deposition on the surface with the voltage brought about higher push-out strength and more new bone formation. These results suggested that 350 V oxidation would be very suitable for obtaining the desired implant surface.
社団法人日本補綴歯科学会の論文
2000-02-10