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Impaired bacterial attachment to light activated Ni-Ti alloy

Chrzanowski, W; Valappil, SP; Dunnill, CW; Abou Neel, EA; Lee, K; Parkin, IP; ... Knowles, JC; + view all (2010) Impaired bacterial attachment to light activated Ni-Ti alloy. MAT SCI ENG C-MATER , 30 (2) 225 - 234. 10.1016/j.msec.2009.10.003.

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Abstract

Ni-Ti alloy due to its unique mechanical properties, is used for many types of implants. Failure of these implants can be attributed to many different factors: however infections are a common problem. In this paper, the attachment of the bacteria, Staphylococcus aureus, to the Ni-Ti Surface modified by a range of processes with and without of light activation (used to elicit antimicrobial properties of materials) was assessed and related to different surface characteristics. Before the light activation the number of bacterial colony forming units was the greatest for the samples thermally oxidised at 600 degrees C. This sample and the spark oxidised samples showed the highest photocatalytic activity but only the thermally oxidised samples at 600 degrees C showed a significant drop of S. aureus attachment. The findings in this study indicate that light activation and treating samples at 600 degrees C is a promising method for Ni-Ti implant applications with inherent antimicrobial properties. Light activation was shown to be an effective way to trigger photocatalytic reactions on samples covered with relatively thick titanium dioxide via accumulation of photons in the surface and a possible increase in defects which may result in free oxygen. Moreover, light activation caused an increase in the total surface energy. (C) 2009 Elsevier B.V. All rights reserved.

Type:Article
Title:Impaired bacterial attachment to light activated Ni-Ti alloy
DOI:10.1016/j.msec.2009.10.003
Keywords:Nickel titanium, Staphylococcus aureus, SEM/FIB, Bacterial attachment, ENHANCED PHOTOCATALYTIC ACTIVITY, FERRITE COMPOSITE NANOPARTICLES, SHAPE-MEMORY ALLOY, IN-VITRO, BIOMATERIAL SYSTEM, MAGNETIC CORE, STAPHYLOCOCCUS-AUREUS, SURFACE-TREATMENT, ESCHERICHIA-COLI, NITROGEN-SOURCE
UCL classification:UCL > School of Life and Medical Sciences > Faculty of Medical Sciences > Eastman Dental Institute > Biomaterials and Tissue Engineering
UCL > School of Life and Medical Sciences > Faculty of Medical Sciences > Eastman Dental Institute > Microbial Diseases
UCL > School of Life and Medical Sciences > Faculty of Medical Sciences > Eastman Dental Institute > Restorative Dental Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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