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Photoactive TiO2 antibacterial coating on surgical external fixation pins for clinical application

Authors Villatte G, Massard C, Descamps S, Sibaud Y, Forestier C, Awitor KO

Received 24 January 2015

Accepted for publication 5 March 2015

Published 6 May 2015 Volume 2015:10(1) Pages 3367—3375

DOI https://doi.org/10.2147/IJN.S81518

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Dr Thomas J Webster

Guillaume Villatte,1,2 Christophe Massard,1 Stéphane Descamps,1,2 Yves Sibaud,1 Christiane Forestier,3 Komla-Oscar Awitor1

1Laboratory C-Biosenss EA 4676, Clermont-Ferrand University, Université d’Auvergne, Clermont-Ferrand, France; 2Department of Orthopedics, Clermont-Ferrand University Hospital (CHU), Clermont-Ferrand, France; 3Laboratory Microorganism UMR 6023, Clermont-Ferrand University, Université d’Auvergne, Clermont-Ferrand, France

Abstract: External fixation is a method of osteosynthesis currently used in traumatology and orthopedic surgery. Pin tract infection is a common problem in clinical practice. Infection occurs after bacterial colonization of the pin due to its contact with skin and the local environment. One way to prevent such local contamination is to create a specific coating that could be applied in the medical field. In this work, we developed a surface coating for external fixator pins based on the photocatalytic properties of titanium dioxide, producing a bactericidal effect with sufficient mechanical strength to be compatible with surgical use. The morphology and structure of the sol-gel coating layers were characterized using, respectively, scanning electron microscopy and X-ray diffraction. The resistance properties of the coating were investigated by mechanical testing. Photodegradation of acid orange 7 in aqueous solution was used as a probe to assess the photocatalytic activity of the titanium dioxide layers under ultraviolet irradiation. The bactericidal effect induced by the process was evaluated against two strains, ie, Staphylococcus aureus and multiresistant Staphylococcus epidermidis. The coated pins showed good mechanical strength and an efficient antibacterial effect after 1 hour of ultraviolet irradiation.

Keywords: hybrid sol-gel, external pin fixation, titanium dioxide, antibacterial effect, mechanical strength, ultraviolet photoactivity

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