In several European countries, dental composites are replacing mercury-containing amalgams as the most common restorative materials. One problem with dental composites is residual stresses which may lead to poor performance of the restoration. Objectives: a combined modeling and materials characterization approach is presented and predictions are compared with experimental data on residual stresses. The model takes into account vitrification through stress relaxation and non-linear shrinkage models. Methods: The predictions of the model were compare with the results of a bimetallic experiment (bending of an aluminum plate) for different Vf. A model material -50:50 Ebecryl 610 (UCB chemicals, Belgium)/TEGDMA, soda lime glass spheres- was used so that the filler volume fraction (Vf) can be varied. Results:

Vf	0	0.07	0.165	0.265	0.4
Calculated stress (MPa)	7.75	7.88	8.64	9.13	9.89
Measured stress (MPa)	8	7	6.6	9.3	9.3

Conclusions: The predictions show a good agreement with the experimental data, showing that the essential physics of the process is captured in the predictions. The approach allows for detailed parametric studies where resin and composite composition as well as cure conditions may be tailored with respect to residual stress generation. The study was supported by TFR, Sweden.

Back to the Dental Materials: VIII - Others-Non-metallic Program
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