COMPARISON OF DYNAMIC MASK- AND VECTOR-BASED CERAMIC STEREOLITHOGRAPHY.

Additive manufacturing (AM) has developed into a promising technology allowing the parallel production of several complex parts with high resolution. Especially AM of ceramics shows great potential in the field of medical and dental applications where personalized aesthetic restorations are demanded. Accuracy is therefore a must to meet the high standards of those fields. At TU Wien we developed a special lithography based manufacturing technology where layer-by-layer a photosensitive slurry with ceramic or glass-ceramic filler is cured. To get dense ceramics the so called green body is then debinded and sintered. Two printing systems were evaluated: The first system uses a Digital Light Processing (DLP) approach, where a digital mirror device projects visible light (460 nm) and triggers polymerization. A second system is based on a diode-laser with 405 nm wavelength. In this case a galvanoscanner is used for structuring. The second system enables a feature resolution down to 20 m. The aim of this study is to compare both of this technologies for multiple ceramics such as zirconium oxide, tricalcium phosphate and composites. In order to get the best accuracy, printing parameters such as laser speed, hatching style, exposure time and intensity are varied. [ABSTRACT FROM AUTHOR]