de Wild, Michael

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de Wild
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Michael
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de Wild, Michael

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2006 - 20092
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Dateien dazu vorhanden?: Nein × Hochschule: Hochschule für Life Sciences × Thema: 600 - Technik, Medizin, angewandte Wissenschaften × Thema: Cell morphology ×

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  • Vorschaubild nicht verfügbar
    Publikation
    Fabrication of TiO2‐coated epoxy replicas with identical dual‐type surface topographies used in cell culture assays
    (Wiley, 01/2009) Schuler, Martin; Kunzler, Tobias P.; de Wild, Michael; Sprecher, Christoph M.; Trentin, Diana; Brunette, Donald M.; Textor, Marcus; Tosatti, Samuele G. P. [in: Journal of Biomedical Materials Research Part A]
    The goal of this study was to reproducibly generate samples with complex surface topographies and chemistries identical to a "master surface" and to test their response in cell culture using rat calvarial cells. Negative replicas of dual-type topography were fabricated using dental impression material with half of the surface exhibiting smooth and rough topography, respectively. Positive epoxy resin replicas were cast from the same negative replica eight times consecutively and coated with a 60-nm thin film of titanium dioxide using a vapor deposition technique. Atomic force microscopy, scanning electron microscopy, confocal white light microscopy, and X-ray photoelectron spectroscopy indicated that TiO2-coated epoxy replicas had surface topographical features and surface compositions nearly indistinguishable from the original titanium master surfaces. The described technique showed high reproducibility over at least eight generations of replication using the same negative replica. Rat calvarial osteoblasts proliferated just as well on dual topography surfaces as on single topography surfaces. The advantage of the dual-type substrates is that they facilitate comparison within a single culture dish, thus eliminating dish-to-dish variation as well as saving material, time and costs compared to the usual method of evaluating surfaces in separate dishes.
    01A - Beitrag in wissenschaftlicher Zeitschrift
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    Publikation
    Biomimetic modification of titanium dental implant model surfaces using the RGDSP-peptide sequence. A cell morphology study
    (Elsevier, 07/2006) Schuler, Martin; Owen, Gethin Rh.; Hamilton, Douglas W.; de Wild, Michael; Textor, Marcus; Brunette, Donald M.; Tosatti, Samuele G.P. [in: Biomaterials]
    Surface topography and (bio)chemistry are key factors in determining cell response to an implant. We investigated cell adhesion and spreading patterns of epithelial cells, fibroblasts and osteoblasts on biomimetically modified, smooth and rough titanium surfaces. The RGD bioactive peptide sequence was immobilized via a non-fouling poly(l-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG) molecular assembly system, which allowed exploitation of specific cell–peptide interactions even in the presence of serum. As control surfaces, bare titanium and bio-inactive surfaces (scrambled RDG and unfunctionalized PLL-g-PEG) were used. Our findings demonstrated that surface topography and chemistry directly influenced the attachment and morphology of all cell types tested. In general, an increase in cell number and more spread cells were observed on bioactive substrates (containing RGD) compared to bio-inactive surfaces. More fibroblasts were present on smooth than on rough topographies, whereas for osteoblasts the opposite tendency was observed. Epithelial cell attachment did not follow any regular pattern. Footprint areas for all cell types were significantly reduced on rough compared to smooth surfaces. Osteoblast attachment and footprint areas increased with increasing RGD-peptide surface density. However, no synergy (interaction) between RGD-peptide surface density and surface topography was observed for osteoblasts neither in terms of attachment nor footprint area.
    01A - Beitrag in wissenschaftlicher Zeitschrift