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Since periapical surgical therapy success depends on adequate apical seal, MTA has been recommended as the best retrofilling material. Objective: To assess whether the association between MTA and Fillapex sealer negatively affects the material apical sealing ability. To this end, apical leakage was tested with 1% rhodamine B was used. Methods: Fifty roots with straight canals were prepared by means of the ProTaper Universal system up to F5 instrument, and filled by means of the modified McSpaden technique. Specimens were divided into four groups: G1, G2 and G3 were subjected to apicoectomy and retropreparation with ultrasonic tip; whereas G4 did not undergo either apicoectomy nor retropreparation, and served as control. G1 was retrofilled with MTA-water, G2 was retrofilled with MTA-Fillapex, and G3 was not retrofilled, thereby serving as negative control. The roots of G4 received two coats of red nail polish, whereas the roots of G1, G2 and G3 were also coated, except in the region where apicoectomy was carried out. Specimens were immersed in 3 ml of 1% rhodamine B for 8 days and stored in an incubator at 37 °C and 100% humidity. In order to have microleakage assessed, the specimens were longitudinally cleaved, photographed and sent to three specialists in Endodontics who analyzed four levels of leakage: zero; 0-1 mm, 1-2 mm and 2-3 mm. Results: Results reveal that the MTA-Fillapex association had less leakage than

Evaluation of apical marginal leakage in teeth retrofilled with MTA-water and MTA-Fillapex: a study in avulsed teeth