Abstract: Abstract: Objective To evaluate the sealability of zinc oxide-eugenol-based root canal sealers of different viscosities. Methods: 60 extracted human single-rooted teeth were selected and randomly divided into six groups (n=10). The root canals were respectively filled with Zinc Oxide-Eugenol sealers and Cortisomol sealers of different viscosities. The teeth were split along long axis after dye penetration. The lengths of root apical dye microleakage were measured with stereopsis microscope. The interface of the dentins and the sealers was observed by the SEM. ANOVA of the SPSS12.0 was used to compare the differences. Results: There were differences among groups of Zinc Oxide-Eugenol sealers and Cortisomol sealers of different viscosities (P<0.05). Conclusion: The increment of the viscosity of zinc oxide-eugenol-based root canal sealers can increase the apical sealing ability of sealers in this experiment.

Key words: Viscosity, Root canal paste, Root canal sealing