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KMID : 0362220100370010069
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Journal of The Korean Research Society for Dental Materials
2010 Volume.37 No. 1 p.69 ~ p.74
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Effect of Precalcification Treatment on Bioactivity of Ti-6Al-4V Alloy Modified by Anodic Oxidation
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Jeon Woo-Yong
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Abstract
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The purpose of this study was to investigate the bone conduction of Ti-6Al-4V alloy modified by anodic oxidation and preca lcification treatments. Specimens of 20×10×1 mm in dimensions were polished sequentially from #220 to #1000 SiC paper, ultrasonically washed with acetone, then rinsed with deionized water. The electrolyte for anodization process consisted of 0.5 M Na2SO4 and 0.7 wt% NaF. Anodization was carried out at a potential of 20 V and current density of 20 mA/cm2 for 2 hours. Specimens were heat-treated at 500℃ for 2 hours and precalcified by soaking in Na2HPO4 solution for 24 hours and then in saturated Ca(OH)2 solution for 5 hours. To evaluate the activity of the precalcified TiO2 nanotube layer, modified specimens were immersed in simula ted body f luid with pH 7 .4 a t 36.5℃ for 10 days. The results obtained were summarized as follows; 1. Vertically-oriented self-organized TiO2 n a notubes of d iameters 6 0.0~90.0 nm were f abrica ted by a nodizing treatment at 20 V for 2 h in an 0.5 M Na2SO4 and 0.7 NaF solution. 2. The amorphous structure of anodized TiO2 nanotubes was changed to anatase structure after heat treatment at 590 ℃ for 2 h. 3. The F ion in anodized TiO2 nanotube layer was removed after heat-treatment at 500 ℃. 4. The bone conduction of TiO2 nanotube layer was more enhanced by precalcification treatment in the solution containing calcium and phosphate ions.
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KEYWORD
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Precalcification, Bioactivity, Anodic oxidation, Nanotube layer
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