Resistencia mecánica de la interfase y de la dentina adyacente. Estudio comparativo de microtracción

Resum

lntroduction: A microtensile test is developed in order to compare the tensile bond strength of sound dentine and those of the adyacent interface between dentine and restorative materials, within the same specimen. Material & method: On the occlusal exposed dentin of perfused third molars crown segments (n= 12) several grooves were cut, which later were filled with Prime & Bond NT adhesive and Z100 and Tetric Ceram composites. Five samples for microtensile test were obtained from each specimen and were submitted to load until detachment. Results: Significant statistical differences were found among mean cohesive dentin strength and the interface dentin/restorative material adhesive strength, for both adhesive systems. No significant statistical differences were found between both restorative materials used with the same adhesive resin. Conclusions: Dentin cohesive strength is higher than dentin/restorative material interface for the materials tested.