Bacteria Death and Osteoblast Metabolic Activity Correlated to Hydrothermally Synthesised TiO2 Surface Properties
Article
Article Title | Bacteria Death and Osteoblast Metabolic Activity Correlated to Hydrothermally Synthesised TiO2 Surface Properties |
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ERA Journal ID | 22271 |
Article Category | Article |
Authors | Jaggessar, Alka, Mathew, Asha, Tesfamichael, Tuquabo, Wang, Hongxia, Yan, Cheng and Yarlagadda, Prasad KDV |
Journal Title | Molecules |
Journal Citation | 24 (7) |
Article Number | 1201 |
Number of Pages | 18 |
Year | 2019 |
Publisher | MDPI AG |
Place of Publication | Switzerland |
ISSN | 1420-3049 |
Digital Object Identifier (DOI) | https://doi.org/10.3390/molecules24071201 |
Web Address (URL) | https://www.mdpi.com/1420-3049/24/7/1201 |
Abstract | Orthopaedic surgery comes with an inherent risk of bacterial infection, prolonged antibiotic therapy and revision surgery. Recent research has focused on nanostructured surfaces to improve the bactericidal and osseointegrational properties of implants. However, an understanding of the mechanical properties of bactericidal materials is lacking. In this work, the surface properties of hydrothermal TiO2 nanostructured surfaces are investigated for their effect on bactericidal efficiency and cellular metabolic activity of human osteoblast cells. TiO2 nanostructures, approximately 307 nm in height and 14 GPa stiffness, were the most effective structures against both gram-positive (Staphylococcus aureus) and gram-negative (Pseudomonas aeruginosa) bacteria. Statistical analysis significantly correlated structure height to the death of both bacteria strains. In addition, the surface contact angle and Young’s modulus were correlated to osteoblast metabolic activity. Hydrophilic surfaces with a contact angle between 35 and 50° produced the highest cellular metabolic activity rates after 24 h of incubation. The mechanical tests showed that nanostructures retain their mechanical stability and integrity over a long time-period, reaffirming the surfaces’ applicability for implants. This work provides a thorough examination of the surface, mechanical and wettability properties of multifunctional hydrothermally synthesised nanostructured materials, capable of killing bacteria whilst improving osteoblast metabolic rates, leading to improved osseointegration and antibacterial properties of orthopaedic implants. |
Keywords | hydrothermal synthesis; osteoblast response; mechanical properties; nanostructured surfaces; bactericidal surfaces; orthopaedic implants |
ANZSRC Field of Research 2020 | 4003. Biomedical engineering |
Byline Affiliations | Queensland University of Technology |
https://research.usq.edu.au/item/y1879/bacteria-death-and-osteoblast-metabolic-activity-correlated-to-hydrothermally-synthesised-tio2-surface-properties
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