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Development of Antibacterial Ti-Cu x Alloys for Dental Applications: Effects of Ageing for Alloys with Up to 10 wt% Cu.

Artikel i vetenskaplig tidskrift
Författare Lee Fowler
Nomsombuluko Masia
Lesley A Cornish
Lesley H Chown
Håkan Engqvist
Susanne Norgren
Caroline Öhman-Mägi
Publicerad i Materials (Basel, Switzerland)
Volym 12
Nummer/häfte 23
ISSN 1996-1944
Publiceringsår 2019
Publicerad vid
Språk en
Länkar dx.doi.org/10.3390/ma12234017
www.ncbi.nlm.nih.gov/entrez/query.f...
Ämneskategorier Biomaterialvetenskap

Sammanfattning

Peri-implantitis, a disease caused by bacteria, affects dental implants in patients. It is widely treated with antibiotics, however, with growing antibiotic resistance new strategies are required. Titanium-copper alloys are prospective antibacterial biomaterials, with the potential to be a remedy against peri-implantitis and antibiotic resistance. The aim of this study was to investigate Ti-Cux alloys, exploring how Cu content (up to 10 wt%) and ageing affect the material properties. Electron microscopy, X-ray diffraction, hardness testing, bacteriological culture, and electrochemical testing were employed to characterize the materials. It was found that alloys with above 3 wt% Cu had two phases and ageing increased the volume fraction of Ti2Cu. An un-aged alloy of 5 wt% Cu showed what could be Ti3Cu, in addition to the α-Ti phase. The hardness gradually increased with increased Cu additions, while ageing only affected the alloy with 10 wt% Cu (due to changes in microstructure). Ageing resulted in faster passivation of the alloys. After two hours the aged 10 wt% Cu alloy was the only material with an antibacterial effect, while after six hours, bacteria killing occurred in all alloys with above 5 wt% Cu. In conclusion, it was possible to tune the material and antibacterial properties of Ti-Cux alloys by changing the Cu concentration and ageing, which makes further optimization towards an antibacterial material promising.

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