Microhardness of composites cured over eugenol-contaminated dentin

Resumo

During fabrication of indirect esthetic restorations a temporary luting cement is necessary. This study evaluated the effect of eugenol-contaminated dentin on polymerization of composite resins. Sixty composite disks were made over previously contaminated dentin with one of five different temporary luting cements (Temp Bond, Temp Bond NE, Rely X Temp, Resin Sensitemp, Freegenol), with two different composites (Filtek Z-100 and Filtek Supreme Plus). Vickers hardness number was obtained for the light side of the sample as well as the bottom side of it. Comparisons were made under a two-way ANOVA with a Tukey-Kramer post-hoc analysis, both calculated at 0.05 significance level. The VHN of all specimens bottom side was lower than the top side in contact with the light. Reduction was in average 12% for composite Supreme Plus and 9% for composite Z-100, all within expected results. Cements such as Freegenol and Temp Bond NE produced sometimes a greater VHN reduction of the bottom side than the eugenol-containing cement. Eugenol contaminated dentin did not reduced the polymerization of composite resin cured over it.