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New in situ measuring methods for the optimization of sintering processes

 
: Raether, F.; Müller, G.

Fabbri, B.:
Fourth Euro-Ceramics 1995. Proceedings of the Fourth European Ceramic Society Conference. Vol.14: The cultural ceramic heritage
Faenza: Ed. Faenza, 1995
pp.103-112
Euro-Ceramics (ECerS) <4, 1995, Riccione>
English
Conference Paper
Fraunhofer ISC ()
in-situ measuring; sintering

Abstract
Due to the unesthetic appearance, the toxicologigal problems of mercury and the galvanic corrision there is a need for a posterior dental filling material which is able to substitute the amalgam fillings. To provide such materials mulifunktional urethane- and thioether oligo (meth)acrylate alkoxysilanes as sol-gel precursors have been used for preparation of a special family of inorganic/organic copolymer composites (ORMOCER s) on a molecular scale.The alkoysilyl groups of the silane allow the formation of inorganic Si-O-Si-network by hydrolysis and polycondensation reactions. In order to achieve X-ray-opacity higher than that of dental enamel silicon can partly be replaced by heavier elements,e.g. zirconium. After incorporation of special dental glass fillers the resulting paste-like composite can be applied by the dentist. Beside the UV- and thermally induced polymersation a light- and redox-induced curing is also possible to build up the additional organic polymer structure. Toxicol ogical problems are not exspected because of the usage of silane-connected acrylates and methacrylates and therefore the linkage to the inorganic polymer structure.

: http://publica.fraunhofer.de/documents/PX-26166.html