Talks and Poster Presentations (without Proceedings-Entry):
M. Pfaffinger, G. Mitteramskogler, Ö. Kaslioglu, J. Stampfl:
"Stereolithographic Additive Manufacturing of Tricalcium Phosphate";
Talk: EURO BioMAT 2015,
In the field of Tissue Engineering scaffolds have a major influence on successfully construct functional tissues like bone. Especially the material properties and scaffold characteristics are of crucial importance to enable cell adhesion and proliferation. To manufacture artificial scaffolds biodegradable ceramics are used due to their biocompatibility as well as their osteoinductive and osteoconductive properties. Further they degrade within 6-12 month inside the living organism and can be replaced by natural tissue.
To facilitate the successful application of artificial scaffolds they have to feature specific characteristics, like a defined porous architecture, surface area and surface quality and predictable physical properties. Therefore new and innovative manufacturing technologies are necessary. At the Vienna University of Technology a stereolithography system, based on the Digital Light Processing (DLP) Technology, was developed to meet the requirements of building sophisticated geometries.
In this work the additive manufacturing of Tricalcium Phosphate is performed. With this new technology geometries with almost non-constrained complexity can be achieved. Therefore engineered structures with i.e. random or tailored pore distribution as well as structural copies of natural bone material can be manufactured. These structures excel in high precision and surface quality. Depending on the complexity of the part (i.e. size, portion of open porosity) adaptations in manufacturing process parameters and slurry composition can be necessary for the flawless production of dense ceramic structures. Furthermore also the cleaning effort of the 3D-printed parts before thermal processing differs. Engineered parts with a regular porosity and a pore size of 300 Ám can be manufactured and cleaned in high quality. Due to the volume shrinkage during the thermal processing step the structures need to be built up-scaled to reach correct final dimensions after sintering. Densities of 88 % of theoretical density could be achieved. The biaxial bending strength is 32 MPa.
Created from the Publication Database of the Vienna University of Technology.