title: The effects of calcium hydroxide removal methods on bond strength of Epiphany SE with two irrigation protocols.
abstract: OBJECTIVE
  The purpose of this study was to compare the effects of five calcium hydroxide removal methods on the bond strength of Epiphany SE sealer after canal irrigation with NaOCl+EDTA or NaOCl+MTAD.
  
  
  METHODS
  The 120 roots were instrumented by using the ProTaper rotary system under irrigation with 2.5% sodium hypochlorite and randomly divided into two major groups according to the final irrigation: 1.3% NaOCl + MTAD and 5% NaOCl + 17% EDTA. For controls, 10 roots from each of the final irrigations with NaOCl + MTAD and NaOCl + EDTA (20 roots) were not filled with Ca(OH)2. The intra-canal paste, Ca(OH)2 was applied to each of the 100 remaining roots and stored at 37°C for 7 days. Each group was sub-divided into five sub-groups (n = 10) according to the removal technique for the intra-canal dressing: Group-1: recapitulation with size 30 K file + 3 ml of saline solution, Group-2: recapitulation with size 30 K file + 3 ml of 5% NaOCl, Group-3: using 5% NaOCl + 17% EDTA, Group-4: using 5%NaOCl + 15% citric acid, and Group-5: using 1.3% NaOCl + 5 ml MTAD. The root canals were filled with Resilon and Epiphany SE sealer. The bond strength was measured.
  
  
  RESULTS
  The mean bond strength of Epiphany SE to root dentine irrigated with NaOCl + MTAD was lower than that of NaOCl + EDTA. The highest bond strengths were 3.31 ± 0.057 and 2.60 ± 0.054 in the NaOCl + citric acid group when Ca(OH)2 was applied to roots treated with NaOCl + EDTA and NaOCl + MTAD, respectively (p < 0.05).
  
  
  CONCLUSIONS
  For root canals treated with NaOCl + EDTA or NaOCl + MTAD, the use of NaOCl + chelating agent for Ca(OH)2 removal does not adversely affect the bond strength of Epiphany SE to dentin.
authors.affiliation: Endodontics Department, Ondokuz Mayis University. Samsun, Turkey. bodrumlu@omu.edu.tr
authors.forename: E
authors.initials: E
authors.lastname: Bodrumlu
authors.forename: A
authors.initials: A
authors.lastname: Avsar
authors.forename: E
authors.initials: E
authors.lastname: Hazar Bodrumlu
authors.forename: E
authors.initials: E
authors.lastname: Cicek
mesh_terms: D002126:Calcium Hydroxide / Q000302:isolation & purification*; D002985:Clinical Protocols; D008422:Materials Testing; D012387:Root Canal Filling Materials; D007507:Therapeutic Irrigation / Q000379:methods*
chemical_list: D012387:Root Canal Filling Materials; C486893:epiphany sealer; D002126:Calcium Hydroxide