Surface Modification on a Porous Co-Cr Scaffold Fabricated by Selective Laser Melting for Bone Implant Applications

Han, C.J.
Chen, X.
Tan, J.W.
Yao, Y.
Wei, Q.S.
Zhang, Z.
Shi, Y.S.
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University of Texas at Austin

Cobalt–chromium–molybdenum alloys with porous structures can be fabricated by additive manufacturing technique, which are attractive for use as scaffolds for bone implant applications. However, metallic implant are difficult to bond directly to living bone due to limited implant interface problems. Therefore, surface modification with scaffold material is required to improve bio-compatibility and the interface surface. In this study, a porous Co-Cr scaffold fabricated by selective laser melting was modified by electrodeposition with biocompatible silk fibroin. The surface characteristics of porous scaffold before and after surface modification were evaluated with the atomic force microscopy, scanning electron microscopy, X-ray diffraction, water contact angle measurement. The mechanical properties including elastic modulus and compressive strength, were determined by compression tests.