AlNx and a-SiOx coatings with corrosion resistance properties for dental implants

Aluminium nitride thin films were deposited on titanium fixtures, while silica thin films were deposited on titanium fixtures and chromium-cobalt substrates, using RF magnetron sputtering. Each coating showed a different corrosion behaviour when electrochemical characterisations were made in a simul...

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Bibliographic Details
Published in:Surface & coatings technology 2011-12, Vol.206 (6), p.1109-1115
Main Authors: Gazia, Rossana, Mandracci, Pietro, Mussano, Federico, Carossa, Stefano
Format: Article
Language:English
Subjects:
Coatings
Deposition
Fixtures
Samples
Silicon dioxide
Statistical analysis
Statistical methods
Titanium base alloys
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Summary:Aluminium nitride thin films were deposited on titanium fixtures, while silica thin films were deposited on titanium fixtures and chromium-cobalt substrates, using RF magnetron sputtering. Each coating showed a different corrosion behaviour when electrochemical characterisations were made in a simulated biological environment, i.e. Hank's solution. Although aluminium nitride was more effective in reducing the localised corrosion on titanium implants, silica showed the best behaviour against general corrosion and the results were consistent for both substrates. The application of a SiO2/AlN bilayer on the Ti fixtures improved the performances of each separate coating. When the coated surfaces were compared to uncoated substrates, there was no statistically significant difference in cell viability in the response of two different human osteoblastic cell lines - Saos-2 and MG-63. FESEM assessed the surface morphology of coated and uncoated samples, whilst FTIR was used to investigate the bonding structure of the barrier layers on silicon samples. On the basis of the data obtained, the tested materials showed promising characteristics for the fabrication of novel dental implants with reduced ion release properties.
ISSN:0257-8972
DOI:10.1016/j.surfcoat.2011.07.091