Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 120, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.msec.2020.111761
Keywords
Surface modifications; Porous materials; Bio-functional materials; Cytocompatible materials; Antibacterial materials
Categories
Funding
- Norte2020, through European Social Fund (FSE), under the National Doctoral Program in Surfaces Engineering and Protection [NORTE-08-5369-FSE-000047]
- Portuguese Foundation for Science and Technology (FCT) - FEDER [POCI-01-0145-FEDER-030708]
- FCT (PIDDAC) project
- National Funds through FCT/MCTES -Portuguese Foundation for Science and Technology [UIDB/50006/2020]
- FEDER [POCI-01-0145-FEDER-030789]
- [UIDB/00285/202]
- [UIDB/04650/2020]
- Fundação para a Ciência e a Tecnologia [UIDB/04650/2020] Funding Source: FCT
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By combining micro-arc oxidation and DC magnetron sputtering techniques, surfaces were endowed with osteoblastic cytocompatibility and antibacterial activity, showing potential application in the development of a new generation of dental implants.
Implant surfaces with cytocompatible and antibacterial properties are extremely desirable for the prevention of implant's infection and the promotion of osseointegration. In this work, both micro-arc oxidation (MAO) and DC magnetron sputtering techniques were combined in order to endow tantalum-based surfaces with osteoblastic cytocompatibility and antibacterial activity. Porous Ta2O5 layers containing calcium (Ca) and phosphorous (P) were produced by MAO (TaCaP) to mimic the bone tissue morphology and chemical composition (Ca/P ratio close to 1.67). Furthermore, zinc (Zn) nanoparticles were deposited onto the previous surfaces by DC magnetron sputtering without or with an additional thin carbon layer deposited over the nanoparticles (respectively, TaCaPZn and TaCaP-ZnC) to control the Zn ions (Zn2+) release. Before osteoblastic cell seeding, the surfaces were leached for three time-points in PBS. All modified samples were cytocompatible. TaCaP-Zn slightly impaired cell adhesion but this was improved in the samples leached for longer immersion times. The initial cell adhesion was clearly improved by the deposition of the carbon layer on the Zn nanoparticles, which also translated to a higher proliferation rate. Both Zn-containing surfaces presented antibacterial activity against S. aureus. The two surfaces were active against planktonic bacteria, and TaCaP-Zn also inhibited sessile bacteria. Attributing to the excellent in vitro performance of the nanostructured Ta surface, with osteoconductive elements by MAO followed by antimicrobial nanoparticles incorporation by magnetron sputtering, this work is clearly a progress on the strategy to develop a new generation of dental implants.
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