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International Journal of Dentistry
Volume 2011, Article ID 541831, 6 pages
Research Article

Removal of Gutta-Percha/Zinc-Oxide-Eugenol Sealer or Gutta-Percha/Epoxy Resin Sealer from Severely Curved Canals: An In Vitro Study

1Department of Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Saveetha University, Chennai 600 077, India
2Department of Dental Material, Islamic Azad University, Dental Branch, Tehran, Iran
3Research Center for Pharmaceutical Nanotechnology and Department of Endodontics, Dental Faculty, Tabriz University (Medical Sciences), Tabriz, Iran
4Bioscience Research Center, College of Dentistry, The University of Tennessee Health Science Center, Memphis, TN, USA
5Baylor College of Dentistry, Texas A&M Health Science Center, Dallas, Texas, USA

Received 3 July 2011; Revised 25 August 2011; Accepted 25 August 2011

Academic Editor: Ali I. Abdalla

Copyright © 2011 Santhoshini Reddy et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The aim of this study was to compare the cleanliness of root canal walls after retreatment using two rotary retreatment files to hand instruments in severely curved canals obturated with gutta-percha and two different sealers. Single rooted mandibular premolars ( ) with root curvatures were instrumented and obturated with gutta-percha and an epoxy resin (Group 1, ) or zinc oxide eugenol sealer (Group 2, ). Following retreatment of the specimens ( ProTaper Universal Retreatment Files (Subgroup B) or R-Endo retreatment files (Subgroup C) after 1 month, split specimens were examined under a stereomicroscope and the percentage of remaining root filling material was statistically compared using one way ANOVA with Bonferroni adjustment for multiple comparisons ( ). The R-Endo system performed significantly better than the other two file systems ( ). None of the systems used in this study cleaned root canals thoroughly. The R-Endo system did provide cleaner walls when compared to the other instruments used. The type of root filling materials had an impact on the outcomes with all techniques.