During the curing process of light curing dental composites the mobility of molecules and molecule segments is reduced leading to a significant increase of the viscosity as well as the ion viscosity. Thus, the kinetics of the curing behavior of 6 different composites was derived from dielectric analysis (DEA) using especially redesigned flat sensors with interdigit comb electrodes allowing for irradiation at the top side and measuring the ion viscosity at the bottom side. As the ion viscosities of dental composites change 1-3 orders of magnitude during the curing process, DEA provides a sensitive approach to evaluate their curing behavior, especially in the phase of undisturbed chain growth. In order to determine quantitative kinetic parameters a kinetic model is presented and examined for the evaluation of the ion viscosity curves. From the obtained results it is seen that DEA might be employed in the investigation of the primary curing process, the quality assurance of ingredients as well as the control of processing stability of the light curing dental composites.

Bonn Rhein Sieg University of Applied Sciences Department of Natural Sciences von Liebig Str 20 D 53359 Rheinbach Germany

Tomas Bata University in Zlin Faculty of Technology Centre of Polymer Systems nam T G Masaryka 5555 CZ 760 01 Zlin Czech Republic

Tomas Bata University in Zlin Faculty of Technology Centre of Polymer Systems nam T G Masaryka 5555 CZ 760 01 Zlin Czech Republic; Bonn Rhein Sieg University of Applied Sciences Department of Natural Sciences von Liebig Str 20 D 53359 Rheinbach Germany

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