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KMID : 0362220110380010033
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Journal of The Korean Research Society for Dental Materials
2011 Volume.38 No. 1 p.33 ~ p.42
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Bioactivity of Ti-Nb-X (X = Zr, Mo) Alloy System with Low Elastic Modulus Modified by Anodic Oxidation and Precalcification Treatments
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Jeong Geun-Young
No Kak-Kyun
Park Ran-Sook
Park Il-Song
Won Dae-Hee
Lee Min-Ho
Bae Tae-Sung
Kim Byung-Il
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Abstract
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This study was performed to investigate bioactivity of precalcified nanotubular TiO2 layer on Ti-Nb-X (X = Zr, Mo) alloy system with low elastic modulus. Two kinds of Ti alloy containing Ti-29Nb-4Mo-0.6Zr and Ti-32Nb-5Zr were melted by using a vacuum furnace and sample ingots were cut with 20×10×1 mm in dimensions. Specimens were polished sequentially from #220 to #1000 SiC paper, ultrasonically washed with acetone, alcohol, and then rinsed with deionized water, and dried in an oven at 50℃ for 24 hours. The electrolyte solution for anodic oxidation was consisted of a glycerol solution containing 1 wt% NH4F and 20 wt% deionized water. Pulse signals with a potential of 20 V and current density of 20 mA/cm2 were applied for 60 minutes. Anodized specimens were precalcified by soaking in NaH2PO4 solution at 80℃ for 30 minutes followed by soaking in saturated Ca(OH)2 solution at 100℃ for 30 minutes and heat-treated at 500℃ for 2 hours. The shapes of nanotubes on Ti-32Nb-5Zr alloy were 71.2±5.0 nm in diameters and 1299.2±72.2 nm in length in glycerol solution containing 20 wt% H2O and 1 wt% NH4F at 20 V, which was shorter by half in diameter and two times longer in length than pure titanium. The bioactivity of nanotubular TiO2 layer on Ti-32Nb-5Zr alloy was improved with precalcification treatment in 0.5 M NaH2PO4 at 80℃ and saturated Ca(OH)2 solution at 100℃. The precalcification effect of pure titanium was higher than that of Ti-32Nb-5Zr alloy. MC3T3-E1 osteoblast cell adhesion on precalcified nanotubular TiO2 surface showed a pronounced protrusion of filopodia and a higher degree of contact with nanotubular surface. Round highly differentiated MC3T3-E1 cells were seen on precalcified Ti-32Nb-5Zr alloy compared to pure titanium.
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KEYWORD
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Anodic oxidation, Bioactivity, Low elastic modulus, Nanotubular TiO2 layer, Precalcification
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