title: Fracture resistance of roots using different canal filling systems.
abstract: OBJECTIVE
  To evaluate the fracture resistance of teeth filled with various canal filling materials.
  
  
  METHODS
  The crowns of 100 single-rooted teeth were removed leaving 12 mm of the roots. The canals were shaped using Endo-Sequence files. Following instrumentation, 80 teeth were divided into four groups. The remaining 20 teeth were divided into two groups. The teeth in each group were filled as follows: Group 1: AH-Plus + Gutta-percha (Cold lateral compaction), Group 2: Resilon + Epiphany (Cold lateral compaction), Group 3: ActiV GP cone + ActiV GP sealer, Group 4: ActiV GP sealer + Gutta-percha (Cold lateral compaction), Group 5: No instrumentation or filling, Group 6: Instrumentation but no filling. After the sealers had set, the roots were embedded in acrylic moulds and subjected to a compressive loading at a rate of 1 mm min(-1). The load at which fracture occurred was recorded and statistically analysed using Kruskal-Wallis one-way analysis of variance and Z-tests.
  
  
  RESULTS
  The fracture values of the experimental teeth were significantly higher than those of the instrumented but unfilled group (P < 0.05). Teeth in the AH-Plus + lateral compaction group had higher fracture resistance compared with the ActiV GP sealer + Gutta-percha group (P < 0.05).
  
  
  CONCLUSIONS
  Systems aiming to obtain a monoblock system were not superior to the conventional AH-Plus + Gutta-percha technique in terms of fracture resistance. The fracture resistance of roots using ActiV GP + lateral compaction Gutta-percha was significantly reduced compared with the AH-Plus + Gutta-percha group.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey.
authors.forename: M
authors.initials: M
authors.lastname: Karapinar Kazandag
authors.forename: H
authors.initials: H
authors.lastname: Sunay
authors.forename: J
authors.initials: J
authors.lastname: Tanalp
authors.forename: G
authors.initials: G
authors.lastname: Bayirli
mesh_terms: D019245:Compressive Strength; D003799:Dental Stress Analysis; D006801:Humans; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods*; D014082:Tooth Fractures / Q000517:prevention & control*; D019553:Tooth, Nonvital / Q000503:physiopathology*
chemical_list: D012387:Root Canal Filling Materials