Modification of Surface Morphology of UHMWPE for Biomedical Implants
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1020-GG05-03
Modification of Surface Morphology of UHMWPE for Biomedical Implants Ahmet Oztarhan1, Emel Sokullu Urkac1, Nusret Kaya1, Mesut Yenigul2, Funda Tihminlioglu3, Ayhan Ezdesir4, Robert Zimmerman5, Satilmis Budak5, C Muntele5, Bopha Chhay5, Daryush Ila5, Efim Oks6, Alexey Nikolaev6, Zekai Tek7, and Rengin Eltem1 1 Bioengineering, Ege University, Bornova, Izmir, 35100, Turkey 2 Chemical engineering, Ege University, Bornova, Izmir, 35100, Turkey 3 Chemical engineering, Izmir Institute of Technology, Izmir, 35000, Turkey 4 Petkim, Izmir, 35000, Turkey 5 Alabama A&M University, Huntsville, AL, 35762 6 High Current Electronics Institute, Tomsk, 634055, Russian Federation 7 Celal Bayar University, Manisa, 45000, Turkey Abstract Ultra High Molecular Weight Polyethylene (UHMWPE) samples were implanted with metal and metal-gas hybrid ions (Ag, Ag+N, C+H, C+H+Ar, Ti+O ) by using improved MEVVA Ion implantation technique [1,2] . An extraction voltage of 30 kV and influence of 1017 ions/cm2 were attempted in this experiment. to change their surface morphologies in order to understand the effect of ion implantation on the surface properties of UHMWPEs. Characterizations of the implanted samples with RBS , ATR - FTIR, spectra were compared with the un-implanted ones . Implanted and unimplanted samples were also thermally characterized by TGA and DSC. It was generally observed that C–H bond concentration seemed to be decreasing with ion implantation and the results indicated that the chain structure of UHMWPE were changed and crosslink density and polymer crystallinity were increased compared to unimplanted ones resulting in increased hardness. It was also observed that nano size cracks (approx.10nm) were significantly disappeared after Ag implantation, which also has an improved antibacterial effect . Contact angle measurements showed that wettability of samples increased with ion implantation. Results showed that metal and metal+gas hybrid ion implantation could be an effective way to improve the surface properties of UHMWPE to be used in hip and knee prosthesis. 1. Introduction Ultra High Molecular Weight Polyethylene (UHMWPE) has been commonly used for acetabular cup of total hip joint replacement as it has densely packed linear polyethylene chains, which gives improved mechanical properties. However the wear of UHMWPE against the articulating metal part and wear debris generated at the surface is recognized as the major cause of loosening and failure of the total joint replacement. Recent studies show that increasing the cross-linking in the polyethylene significantly reduces wear leading to more durable acetabular components and increasing the lifetime of an implant . Increasing the cross-link density of UHMWPE in which UHMWPE is irradiated in air at an elevated temperature with a high-dose-rate electron beam or a common approach is
to cross-link the polymer by gamma irradiation, which improves markedly the wear resistance of the polymer but with changed bulk properties [3]. In this work, we tried to change the su
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