Mina zarei - Professor of Endodontics, Dental Materials Research Center, Schooly of Dentistry, Mashhad university of Medical Sciences, Mashhad, Iran
Zeinab Kazemi - Endodontist
Maryam Javidi - Professor of Endodontics,Dental Materials Research Center,Mashhad University of Medical Sciences,Mashhad,Iran
Maryam Shayani Rad - Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
Sahar Karimpour - Dentist
Maryam Forghani - Associate Professor of Endodontics, Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran

Introduction: The Aim of endodontic treatment is to remove infection and prevent recontamination of root canal system. Endodontic sealers are used to fill irregularities that are inaccessible for core filling material. Their penetration into dentinal tubules is of great importance to obtain a better seal. Sealers with nanoparticles may have a deeper penetration because of their smaller particles. The purpose of this study was to compare the penetration ability of a new nanoparticle sealer with two other sealers. Methods: Twenty single-rooted premolars were decoronated and prepared using NeoNiTi rotary files. Then the smear layer was removed and canals were randomized in three groups and filled with gutta-percha. Nano-ZnO sealer, AH26, and Pulp Canal Sealers were used for each group. Teeth were sectioned at two levels (4 and 8 mm from the apex) and examined under a scanning electron microscope. Results: The results showed the deepest penetration for AH26 Penetration depth in the coronal section was deeper than apical. There was no significant difference between penetration depth of AH26 and Nano-ZnO sealer in the apical region, but AH26 showed significantly more penetration in coronal section. Conclusion: According to the results of this study, Nano-ZnO sealer showed less penetrability compared to AH26 in coronal region of the roots.

AH26, Nano-ZnO sealer, Pulp Canal Sealer, scanning electron microscope, tubular penetration