Although Titanium and its alloys are generally used for the manufacturing of dental implant abutments, they are typically prone to bacterial infection, due to their implantation in the transgingival region. In close contact with the soft surrounding tissue, the surface may be functionalized in order to improve connective tissue cells adhesion while preventing bacterial penetration at the interface. Ultrafast laser processing of dental implants has demonstrated the potential to obtain unique surface features, down to the nanoscale. With this study, we introduce the possibility to generate laser-induced periodic surface structures (LIPSS) by picosecond laser processing, with periodicity of about 500 nm on large-scale surfaces, in a contamination-free approach. By changing the applied laser dose, different surface coloring of TiAl6V4 samples is obtained due to a gradual surface oxidation, as revealed by depth-profile compositional analyses. In the same time, an increase of the irradiation dose induced the formation of thicker oxide layers, the oxygen content increasing up to ten times. The response of human mesenchymal stem cells (hMSCs) in contact with laser processed surfaces was evaluated to assess samples cytocompatibility. It was demonstrated that large-scale, uniform LIPSS distributed on whole TiAl6V4 surface are beneficial to hMSCs viability and proliferation.
Nanohybrid surface layers consisting of semiconductor transmission metal oxide nanoparticles and carbon based nanomaterials were prepared by matrix assisted pulsed laser evaporation (MAPLE). The photocatalytic decomposition efficiency of the nanocomposite layers was studied against microorganisms, yeast, bacteria, and virus cells constituents under UV, visible, and solar light irradiation. Transition metal oxide semiconductor materials are widely investigated photocatalysts, being non-toxic, eco-friendly, and cost effective. However, their use in practical applications is constrained by their relatively wide band gap, limiting the absorption range to the UV spectrum of the solar radiation, and high recombination rate of photo-induced electron-hole pairs. Our purpose in this study was to overcome these inconveniencies. The enhanced photocatalytic efficiency of the nanohybrid layers as compared to the reference single component layers was attributed to the synergistic effects between the constituent nanomaterials.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.