TY - CONF A1 - Wirth, Cynthia T1 - Development and processing of bioceramics at the BAM T2 - TMCE Symposium CY - Budapest, Hungary DA - 2014-05-19 PY - 2014 N1 - Geburtsname von Wirth, Cynthia: Gomes, C. M. - Birth name of Wirth, Cynthia: Gomes, C. M. AN - OPUS4-32493 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wirth, Cynthia T1 - Highly porous LAS glass-ceramics by 3D printing T2 - 37th International Conference and Exposition on Advanced Ceramics and Composites CY - Daytona Beach, FL, USA DA - 2013-01-27 PY - 2013 N1 - Geburtsname von Wirth, Cynthia: Gomes, C. M. - Birth name of Wirth, Cynthia: Gomes, C. M. AN - OPUS4-27842 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wirth, Cynthia T1 - Additive manufacturing of bioaktive ceramic scaffolds T2 - XI Encontro da SBPMat CY - Florianópolis, Brazil DA - 2012-09-23 PY - 2012 N1 - Geburtsname von Wirth, Cynthia: Gomes, C. M. - Birth name of Wirth, Cynthia: Gomes, C. M. AN - OPUS4-27839 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wirth, Cynthia A1 - Lopez-Heredia, A. T1 - Dynamic cell culture on glassy crystalline calcium alkali orthophosphates scaffolds T2 - International Symposium on Apatit and Corellative Biomaterials CY - Nantes, France DA - 2013-06-05 PY - 2013 N1 - Geburtsname von Wirth, Cynthia: Gomes, C. M. - Birth name of Wirth, Cynthia: Gomes, C. M. AN - OPUS4-28862 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zocca, Andrea A1 - Elsayed, H. A1 - Bernardo, E. A1 - Wirth, Cynthia A1 - Lopez-Heredia, M.A. A1 - Knabe, C. A1 - Colombo, P. A1 - Günster, Jens T1 - 3D-printed silicate porous bioceramics using a non-sacrificial preceramic polymer binder N2 - Silicate bioceramics possess an excellent bioactivity; however, shaping them into complex geometries is still challenging. Therefore, this paper aims to present a new strategy for the shaping of a bioglass-ceramic with controlled geometry and properties starting from a glass powder combined with a preceramic polymer, i.e. a silicon resin, and reactive fillers. The powder-based three-dimensional (3D)-printing of wollastonite (CaSiO3)-based silicate bioceramic parts was demonstrated in this work. The resin plays a dual role, as it not only acts as a non-sacrificial binder for the filler powders in the printing process but it also reacts with the fillers to generate the desired bioceramic phases. The mechanical and physical properties, i.e. ball-on-three-balls test, density, porosity and morphology, were evaluated in 3D-printed discs. These samples possessed a total porosity around 64 vol% and a biaxial flexural strength around 6 MPa. The raw materials used in this work also enabled the 3D-printing of scaffolds possessing a designed multi-scale porosity, suitable bioceramic phase assemblage and a compressive strength of 1 MPa (for cylindrical scaffolds with total porosity ~80 vol%). Solubility in TRIS/HCl and in vitro assays, i.e. viability, cytotoxicity and apoptosis assays, were also performed. In vitro tests indicated good cell viability and no cytotoxicity effect on the cells. KW - KNN KW - Glass microspheres PY - 2015 DO - https://doi.org/10.1088/1758-5090/7/2/025008 SN - 1758-5082 VL - 7 IS - 2 SP - 025008 PB - IOP Publ. CY - Philadelphia AN - OPUS4-34957 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mühler, T. A1 - Heinrich, J. A1 - Wirth, Cynthia A1 - Günster, Jens T1 - Slurry-based additive manufacturing of ceramics N2 - Most additive manufacturing (AM) techniques have in common that material is spread out as thin layers of a dried powder/granulate by a roller or a shaker system. These layers are mostly characterized by a low packing rate. On the other hand, appreciable densities can be reached by the use of ceramic slurries. In this context, the layer-wise slurry deposition (LSD) has been developed. Specific features of the LSD process are reflected on the basis of already existing additive manufacturing technologies. The microstructure of laser-sintered bodies will be discussed, and strategies for an improved microstructure during sintering will be introduced. KW - Additive manufacturing KW - Ceramic KW - Selective laser sintering PY - 2015 DO - https://doi.org/10.1111/ijac.12113 SN - 1546-542X SN - 1744-7402 N1 - Geburtsname von Wirth, Cynthia: Gomes, C. M. - Birth name of Wirth, Cynthia: Gomes, C. M. VL - 12 IS - 1 SP - 18 EP - 25 PB - American Ceramic Soc. CY - Westerville, Ohio AN - OPUS4-29937 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wirth, Cynthia T1 - Additive manufacturing of ceramic materials T2 - 57th Congresso Brasileiro de Ceramica (57th Congress of the Brazilian Ceramic Society) CY - Natal, Brazil DA - 2013-05-19 PY - 2013 N1 - Geburtsname von Wirth, Cynthia: Gomes, C. M. - Birth name of Wirth, Cynthia: Gomes, C. M. AN - OPUS4-29882 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zocca, Andrea A1 - Wirth, Cynthia A1 - Bernardo, E. A1 - Müller, Ralf A1 - Günster, Jens A1 - Colombo, P. T1 - LAS glass-ceramic scaffolds by three-dimensional printing N2 - Highly porous (>60% open porosity) glass–ceramic scaffolds with remarkable mechanical properties (compression strength of ~15 MPa) were produced by indirect 3D printing. Precursor glass powders were printed into 3D ordered structures and then heat treated to sinter and develop crystalline phases. The final glass–ceramic contained a β-spodumene solid solution together with a secondary phase of lithium disilicate. The precision of the printed geometry and the density of the struts in the scaffold depended on several processing parameters (e.g. powder size and flowability, layer thickness) and were improved by increasing the binder saturation and drying time. Two types of powders with different particle size distribution (PSD) and flowability were used. Powders with a larger PSD, could be processed within a wider range of printing parameters due to their good flowability; however, the printing precision and the struts density were lower compared to the scaffolds printed using the powder in a smaller average PSD. KW - Glass ceramics KW - Porosity KW - Shaping KW - Strength KW - Additive manufacturing PY - 2013 DO - https://doi.org/10.1016/j.jeurceramsoc.2012.12.012 SN - 0955-2219 SN - 1873-619X N1 - Geburtsname von Wirth, Cynthia: Gomes, C. M. - Birth name of Wirth, Cynthia: Gomes, C. M. VL - 33 IS - 9 SP - 1525 EP - 1533 PB - Elsevier CY - Oxford AN - OPUS4-28284 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Elsayed, H. A1 - Zocca, Andrea A1 - Bernardo, E. A1 - Wirth, Cynthia A1 - Günster, Jens A1 - Colombo, P. T1 - Development of bioactive silicate-based glass-ceramics from preceramic polymer and filler N2 - 2014AbstractWollastonite/apatite glass-ceramics have been successfully prepared by a novel approach, consisting of the heat treatment of a silicone resinembedding micro-sized CaCO3particles, that act as reactive fillers, and bioactive glass powder in the SiO2–CaO–P2O5–K2O–Na2O–MgO–CaF2system. Zn-containing silicates, such as hardystonite (Ca2ZnSi2O7) and willemite (Zn2SiO4), were also developed either by directly mixing ZnOpowders with the glass, or by embedding them in the preceramic polymer, as additional fillers. KW - Additive manufacturing KW - Ceramics PY - 2015 DO - https://doi.org/10.1016/j.jeurceramsoc.2014.09.020 SN - 0955-2219 SN - 1873-619X VL - 35 SP - 731 EP - 739 PB - Elsevier Ltd. CY - Oxford AN - OPUS4-34955 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wirth, Cynthia T1 - Microstructure evolution of a glass ceramic system producend by Layerwise Slurry Deposition (LSD) T2 - EUROMAT 2011 - European Congress and Exhibition on Advanced Materials and Processes CY - Montpellier, France DA - 2011-09-12 PY - 2011 N1 - Geburtsname von Wirth, Cynthia: Gomes, C. M. - Birth name of Wirth, Cynthia: Gomes, C. M. AN - OPUS4-25206 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -