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Modeling of the viscoelastic behavior of dental light-activated resin composites during curing
Bibi S Dauvillier1, Maxim P Aarnts, Albert J Feilzer
1Department of Dental Materials Science, Academic Centre of Dentistry Amsterdam (ACTA), Louwesweg 1, NL-1066 EA, Amsterdam, The Netherlands. b.dauvillier@acta.nl
Objective:
Three models consisting of springs and dashpots were investigated to describe the viscoelastic behavior of a commercial light-activated restorative composite during curing.
Methods:
Stress-strain data on Z100 were recorded by means of a dynamic test method performed on a universal testing machine. The model was tested by matching its response to experimental data and the material parameters, E (Young's modulus) and eta (viscosity), associated with the model were calculated.
Results:
The universal testing machine generated reliable stress-strain data on the fast curing, light-activated resin composite during curing. The high polymerization rate of Z100 had a negative effect on the viscous flow capability of the material. A predictive model of the viscoelastic behavior of Z100 during curing was carried out, using the Maxwell model for the initial 3 min in the curing process and the Kelvin model for the remainder of the process.
Significance:
Dental researchers analyzing shrinkage stress problems by mathematical modeling can obtain a good quantitative estimate of the shrinkage stress development of Z100 before the restoration is actually made.