Abstract
)Abstract Ti scaffolds with a three-dimensional porous structure were successfully fabricated using powdermetallurgy and modified rapid prototyping (RP) process. The fabricated Ti scaffolds showed a highly porousstructure with interconnected pores. The porosity and pore size of the scaffolds were in the range of 66~72%and 300~400µm, respectively. The sintering of the fabricated scaffolds under the vacuum caused the Tiparticles to bond to each other. The strength of the scaffolds depended on the layering patterns. Thecompressive strength of the scaffolds ranged from 15 MPa to 52 MPa according to the scaffolds’ architecture.The alkali treatment of the fabricated scaffolds in an aqueous NaOH solution was shown to be effective inimproving the bioactivity. The surface of the alkali-treated Ti scaffolds had a nano-sized fibre-like structure.The modified surface showed a good apatite forming ability. The apatite was formed on the surface of the alkalitreated Ti scaffolds within 1 day. The thickness of the apatite increased when the soaking time in a simulatedbody fluid (SBF) solution increased. It is expected that the surface modification of Ti scaffolds by alkalitreatment could be effective in forming apatites in vivo and can subsequently enhance bone formation.Key wordsTi scaffold, alkali treatment, SBF, bioactivity, rapid prototyping.
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