RESUMO
Background: The root canal sealers form an important component of the three dimensional obturation of the root canals. Moreover, the penetration of the sealers into the dentinal tubules is a desirable phenomenon for their adequate sealing and antibacterial action. The aim of this study was to evaluate the effects of ultrasonic activation on the intratubular penetration of bioceramic root canal sealer. Methods: Eighty extracted human mandibular premolars were divided into 2 groups (n =40) according to the sealer activation method used to obturate the root canals instrumented with F3 Pro-Taper instruments .The canals were obturated using Protaper F3 guttapercha cones. Previously, the bio ceramic sealer was labeled with rhodamine B dye to allow analysis under a confocal microscope. The two groups were: UA (ultrasonically activated) and NA (no activation; control). All samples were sectioned at 3 and 8 mm from the apex. The percentages of dentinal sealer penetration segments of canal were analyzed. Results: Students T test was performed for the statistical analysis and we found that there was a significant increase in tubular penetration for the ultrasonic activation group.Conclusion: Use of ultrasonic activation of a bioceramic sealer promoted greater dentinal sealer penetration.