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Chemical, Corrosion and Topographical Analysis of Stainless Steel Implants after Different Implantation PeriodsDivision of Biomaterials and Tissue Engineering UCL Eastman Dental Institute, University College London 256 Gray's Inn Road, London WC1X 8LD, UK
Division of Biomaterials and Tissue Engineering UCL Eastman Dental Institute, University College London 256 Gray's Inn Road, London WC1X 8LD, UK
Division of Biomaterials and Tissue Engineering UCL Eastman Dental Institute, University College London 256 Gray's Inn Road, London WC1X 8LD, UK, j.knowles{at}eastman.ucl.ac.uk
University of Silesia, Institute of Physics, ul. Uniwersytecka 4,40-007 Katowice, PL
Department of Pediatric Surgery, Silesian Medical University Minimally Invasive Surgery Center for Adults and Children University Hospital No. 1, 3 Maja 13-15, 41-800 Zabrze, PL
Biomedical Engineering Centre, The Silesian University of Technology, ul. Akademicka 2a, 44-100 Gliwice, PL The aim of this work is to examine the corrosion properties, chemical composition, and material—implant interaction after different periods of implantation of plates used to correct funnel chest. The implants are made of 316L stainless steel. Examinations are carried out on three implants: new (nonimplanted) and two implanted for 29 and 35 months. The corrosion study reveals that in the potential range that could occur in the physiological condition the new bar has the lowest current density and the highest corrosion potential. This indicates that the new plate has the highest corrosion resistance and the corrosion resistance could be reduced during implantation by the instruments used during the operation. XPS analysis reveals changes in the surface chemistry. The longer the implantation time the more carbon and oxygen are observed and only trace of elements such as Cr, Mo are detected indicating that surface is covered by an organic layer. On some parts of the implants whitish tissue is observed: the thickness of which increased with the time of implantation. This tissue was identified as an organic layer; mainly attached to the surface on the areas close to where the implant was bent to attain anatomical fit and thus where the implant has higher surface roughness. The study indicates that the chest plates are impaired by the implantation procedure and contact with biological environment. The organic layer on the surface shows that the implant did not stay passive but some reactions at the tissue-implant interface occurred. These reactions should be seen as positive, as it indicates that the implants were accepted by the tissues. Nevertheless, if the implants react, they may continue to release chromium, nickel, and other harmful ions long term as indicated by lower corrosion resistance of the implants following implantation.
Key Words: 316L stainless steel • implants corrosion • funnel chest (pectus excavatum) implants • XPS of implant surface • implants examination • AFM of implant surface • post implantation examination of the funnel chest plate.
This version was published on July
1, 2008 Journal of Biomaterials Applications, Vol. 23, No. 1,
51-71 (2008) |
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