Modeling of the viscoelastic behavior of dental light-activated resin composites during curing

• Published in: Dental materials 2003-06, Vol.19 (4), p.277-285
• Main Authors: Dauvillier, Bibi S, Aarnts, Maxim P, Feilzer, Albert J
• Format: Article
• Language: English
• Subjects: Composite Resins - chemistry; Composite Resins - radiation effects; Dental composites; Dental Restoration, Permanent; Dental Stress Analysis; Dentistry; Elasticity; Light; Mathematical modeling; Models, Chemical; Photocuring; Shrinkage stress; Silicon Dioxide - chemistry; Silicon Dioxide - radiation effects; Viscoelasticity; Viscosity; Zirconium - chemistry; Zirconium - radiation effects
• ISSN: 0109-5641; 1879-0097
• DOI: 10.1016/S0109-5641(02)00041-6

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 η (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.