Curing kinetics of visible light curing dental resin composites investigated by dielectric analysis (DEA).
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.
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. Electronic address: Johannes.Steinhaus@h-brs.de.
Johannes
J
Steinhaus
Tomas Bata University in Zlin, Faculty of Technology, Centre of Polymer Systems, nam. T.G. Masaryka 5555, CZ-760 01 Zlin, Czech Republic.
Berenika
B
Hausnerova
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.
Thomas
T
Haenel
Bonn-Rhein-Sieg University of Applied Sciences, Department of Natural Sciences, von Liebig Str. 20, D-53359 Rheinbach, Germany.
Mandy
M
Großgarten
Bonn-Rhein-Sieg University of Applied Sciences, Department of Natural Sciences, von Liebig Str. 20, D-53359 Rheinbach, Germany. Electronic address: bernhard.moeginger@h-brs.de.
Bernhard
B
Möginger
D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects*; D055117:Curing Lights, Dental; D006244:Hardness; D007700:Kinetics; D008422:Materials Testing; D044367:Phase Transition; D013696:Temperature; D014783:Viscosity
D003188:Composite Resins
Curing behavior; Curing kinetics; Dental composites; Dielectric analysis (DEA); Ion viscosity; Visible light curing