



@article {3292,
	title = {Modulation of human dermal microvascular endothelial cell and human gingival fibroblast behavior by micropatterned silica coating surfaces for zirconia dental implant applications},
	journal = {Science and Technology of Advanced Materials},
	volume = {15},
	year = {2014},
	note = {Export Date: 21 November 2014},
	month = {2014},
	abstract = {Dental ceramic implants have shown superior esthetic behavior and the absence of induced allergic disorders when compared to titanium implants. Zirconia may become a potential candidate to be used as an alternative to titanium dental implants if surface modifications are introduced. In this work, bioactive micropatterned silica coatings were produced on zirconia substrates, using a combined methodology of sol-gel processing and soft lithography. The aim of the work was to compare the in vitro behavior of human gingival fibroblasts (HGFs) and human dermal microvascular endothelial cells (HDMECs) on three types of silica-coated zirconia surfaces: flat and micropatterned (with pillars and with parallel grooves). Our results showed that cells had a higher metabolic activity (HGF, HDMEC) and increased gene expression levels of fibroblast-specific protein-1 (FSP-1) and collagen type I (COL I) on surfaces with pillars. Nevertheless, parallel grooved surfaces were able to guide cell growth. Even capillary tube-like networks of HDMEC were oriented according to the surface geometry. Zirconia and silica with different topographies have shown to be blood compatible and silica coating reduced bacteria adhesion. All together, the results indicated that microstructured bioactive coating seems to be an efficient strategy to improve soft tissue integration on zirconia implants, protecting implants from peri-implant inflammation and improving long-term implant stabilization. This new approach of micropatterned silica coating on zirconia substrates can generate promising novel dental implants, with surfaces that provide physical cues to guide cells and enhance their behavior. {\textcopyright} 2014 National Institute for Materials Science.},
	keywords = {bacteria adhesion, Biomaterials, hemolysis, human dermal microvascular endothelial cells (HDMECs), human gingival fibroblasts (HGFs), Micropatterning, Soft lithography},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84898687729\&partnerID=40\&md5=f252b87aeb163775547158cad0cf658b},
	author = {Laranjeira, M.S. and Carvalho, {\^A}. and Pelaez-Vargas, A. and Hansford, D. and Ferraz, M.P. and Coimbra, S. and Costa, E. and Santos-Silva, A. and Fernandes, M.H. and Monteiro, F.J.}
}
@article {2243,
	title = {Early spreading and propagation of human bone marrow stem cells on isotropic and anisotropic topographies of silica thin films produced via microstamping},
	journal = {Microscopy and MicroanalysisMicrosc. Microanal.},
	volume = {16},
	year = {2010},
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},
	month = {2010///},
	pages = {670 - 676},
	abstract = {While there has been rapid development of microfabrication techniques to produce high-resolution surface modifications on a variety of materials in the last decade, there is still a strong need to produce novel alternatives to induce guided tissue regeneration on dental implants. High-resolution microscopy provides qualitative and quantitative techniques to study cellular guidance in the first stages of cell-material interactions. The purposes of this work were (1) to produce and characterize the surface topography of isotropic and anisotropic microfabricated silica thin films obtained by sol-gel processing, and (2) to compare the in vitro biological behavior of human bone marrow stem cells on these surfaces at early stages of adhesion and propagation. The results confirmed that a microstamping technique can be used to produce isotropic and anisotropic micropatterned silica coatings. Atomic force microscopy analysis was an adequate methodology to study in the same specimen the sintering derived contraction of the microfabricated coatings, using images obtained before and after thermal cycle. Hard micropatterned coatings induced a modulation in the early and late adhesion stages of cell-material and cell-cell interactions in a geometry-dependent manner (i.e., isotropic versus anisotropic), as it was clearly determined, using scanning electron and fluorescence microscopies. {\textcopyright} Microscopy Society of America 2010.},
	keywords = {AFM, Atomic force microscopy, audiovisual equipment, cell adhesion and proliferation, Cell Culture Techniques, cell proliferation, conference paper, culture technique, cytology, Fluorescence microscopy, Guided tissue regeneration, human, Humans, Microscopy, Atomic Force, Microscopy, Electron, Scanning, Microscopy, Fluorescence, microstamping, Motion Pictures as Topic, myeloid progenitor cell, Myeloid Progenitor Cells, Scanning electron microscopy, SEM, silica sol-gel films, silicon dioxide, Soft lithography, Surface Properties, surface property, Tissue regeneration, tissue scaffold, Tissue Scaffolds},
	isbn = {14319276 (ISSN)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79451471917\&partnerID=40\&md5=c68d4037bb3535a092d46c2602a8b4bd},
	author = {Pelaez-Vargas, A. and Gallego-Perez, D. and Ferrell, N. and Fernandes, M.H. and Hansford, D. and Monteiro, F.J.}
}
