Methods: Ninety - six single-rooted premolars were randomly divided into 8 groups of 12 teeth each. Groups 1,2,3 and 4 were filled with Eugenato and 5,6,7 and 8 with Eco-temp®. Specimens of 2,4,6 and 8 groups were submitted to thermocycling (100 cycles; 5°C and 55°C). Coronal microleakage was measured using the dye penetration technique for four groups and the electrochemical method was used for the remaining four.
Results: The results were analyzed using the parametric test (Student t test) for independent samples and Mann Whitney U test was used to compare the methods of filtration. There was statistically significant difference in coronal microleakage between the two provisional restorative materials with and without thermocycling. The Eco-temp® provides a lower microleakage compared to Eugenato.
Conclusion: There was no statistically significant difference in the results of coronal microleakage when comparing the dye penetration method with the electrochemical evaluation.