title: Retreatability of Root Canals Obturated Using Gutta-Percha with Bioceramic, MTA and Resin-Based Sealers.
abstract: BACKGROUND
  The aim of this study was to evaluate the retreatability of root canals obturated with gutta-percha (GP) and three different endodontic sealers [iRoot SP (bioceramic sealer), MTA Fillapex (MTA-based sealer) and AH-26 (epoxy resin-based sealer)] using the ProTaper Universal Retreatment (PTR) system.
  
  
  METHODS
  Forty extracted single-rooted human teeth were prepared with universal ProTaper files up to F4 (40/0.06). Specimens were randomly divided into four groups according to obturation technique/material: single-cone GP/AH-26, lateral compaction of GP/AH-26, single-cone GP/iRoot SP, and single-cone GP/MTA Fillapex. Root fillings were removed with PTR. The time taken to reach the working-length (TWL) was recorded. Roots were longitudinally sectioned and each half was evaluated using a stereomicroscope. Three observers scored each third of all specimen. Obtained data were analyzed using the Kruskal-Wallis, Mann-Whitney U, Welch and Games-Howell tests. The level of significance was set at 0.05.
  
  
  RESULTS
  In single-cone GP/MTA Fillapex group the TWL was significantly shorter. The remnant of filling material in the apical and middle thirds of groups was similar and higher than the coronal thirds.
  
  
  CONCLUSIONS
  None of the tested sealers were completely removed from the root canal system.
authors.affiliation: Hacettepe University, Dental School, Department of Endodontics, Ankara, Turkey.
authors.forename: Emel
authors.initials: E
authors.lastname: Uzunoglu
authors.affiliation: Hacettepe University, Dental School, Department of Endodontics, Ankara, Turkey.
authors.forename: Zeliha
authors.initials: Z
authors.lastname: Yilmaz
authors.affiliation: Hacettepe University, Dental School, Department of Endodontics, Ankara, Turkey.
authors.forename: Derya Deniz
authors.initials: DD
authors.lastname: Sungur
authors.affiliation: Hacettepe University, Dental School, Department of Endodontics, Ankara, Turkey.
authors.forename: Emre
authors.initials: E
authors.lastname: Altundasar
keywords: Bioceramics; Epoxy Resin; Mineral Trioxide Aggregate; Retreatment; Root Canal Sealer
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