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Author Shaw, L.L.; Li, X.-X.; Wang, J.-W.; Marcus, H.L.; Cameron, T.B.; Kennedy, C. ; Department of Metall. and Mat. Eng., Institute of Materials Science, University of Connecticut, Storrs, CT 06269, United States
Source Proc TMS Fall Meet 2002 p 107-116 Proceedings of Symposium on Rapid Prototyping of Materials Oct 7-10 2002 Columbus, OH, United States
Abstract Densification of dental porcelain powder via a moving laser beam has been investigated in order to build dental restorations through layer-by-layer solid freeform fabrication (SFF) approaches. Both single line scans and multi-line scans with different overlaps between adjacent scans have been studied. It is found that a variety of defects such as cracks, distortion and macro-discontinuity can appear in laser-densified porcelain bodies if laser processing parameters (e.g. the laser processing temperature, laser scan rate, scan overlapping distance, and substrate pre-heating) are not appropriate. The phenomena observed have been discussed in terms of the vaporization of dental porcelains, surface tension effects, Marangoui forces, thermal transient and residual stresses. Methods and laser processing conditions that can lead to the prevention of the aforementioned defects have been discussed. [References: 14] (Auth abstract) XX