A numerical, theoretical and experimental study of the effect of thermocycling on the matrix-filler interface of dental restorative materials

Thermocycling is widely used to age dental composites but with very different results from one study another, even apparent similar conditions. This aims at understanding better the relative damaging speed of matrix and fillers, based on theoretical models. Eight formulations an experimental material were produced. The same organic was silanated barium glass particles added as fillers filler ratios. Samples thermocycled up 10 000 cycles. Three-point bending tests carried out steps. yield stress measured among other mechanical properties. Composite properties degraded by thermocycling. decrease slight during first 5 cycles whereas it decreased significantly after Turcsányi model asserts that interface slightly affected in then falls down, while linear. Each component a composite does not rate. First, acts protector until water finds its way interphase. silanization treatment highly sensitive hydrolysis damaged rapidly moment. Numerical simulations surface observations confirmed cracks appear propagate neighbourhood directly within it.