title: Apical sealing ability of 2 epoxy resin-based sealers used with root canal obturation techniques based on warm gutta-percha compared to cold lateral condensation.
abstract: OBJECTIVE
  To evaluate the apical sealing ability of 2 epoxy resin-based root canal sealers used with 2 different warm gutta-percha obturation techniques and cold lateral condensation.
  
  
  METHODS
  The root canals of 72 freshly extracted single-root incisors were prepared and randomly assigned to 6 experimental groups. Root canal fillings were performed using either cold lateral condensation, warm vertical condensation, or Thermafil obturators with EndoRez or AH Plus as sealer. After root canal filling, the teeth were stored in 5% methylene blue solution for 7 days. Linear dye penetration was measured in bisected specimens by a calibrated investigator using a light microscope.
  
  
  RESULTS
  Statistical analysis revealed significantly higher penetration depths in groups where EndoRez was used (P < .05, Tukey test). Regarding the different obturation techniques, the least amount of dye penetration was observed for AH Plus and EndoRez when warm vertical condensation was used.
  
  
  CONCLUSIONS
  The results of this study indicate that the apical sealing ability of EndoRez is not as effective as that of AH Plus. Thermafil obturators and warm vertical condensation achieved seals with low dye penetration depth. The use of these techniques might decrease the risk of apical leakage.
authors.affiliation: Martin-LutherUniversity, Department of Operative Dentistry and Periodontology, University School of Dental Medicine, Halle, Germany. christian.gernhardt@medizin.uni-halle.de
authors.forename: Christian Ralf
authors.initials: CR
authors.lastname: Gernhardt
authors.forename: Thomas
authors.initials: T
authors.lastname: Krüger
authors.forename: Katrin
authors.initials: K
authors.lastname: Bekes
authors.forename: Hans-Guenter
authors.initials: HG
authors.lastname: Schaller
mesh_terms: D000704:Analysis of Variance; D003080:Cold Temperature; D003188:Composite Resins; D003763:Dental Leakage / Q000517:prevention & control*; D004853:Epoxy Resins; D006171:Gutta-Percha; D006358:Hot Temperature; D006801:Humans; D007180:Incisor; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods*; D018709:Statistics, Nonparametric
chemical_list: D003188:Composite Resins; C481259:EndoRez; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; D006171:Gutta-Percha