title: Effect of final irrigation protocols on push-out bond strength of an epoxy resin root canal sealer to dentin.
abstract: The purpose of the present study was to evaluate the effect of different final irrigation protocols on push-out bond strength of an epoxy resin root canal sealer to dentin. Eighty single-rooted anterior teeth were used. The root canals were partially prepared using a rotary system and the final diameter was standardised using a #5 Gates-Glidden drill prior to the push-out bond test. During chemomechanical preparation, 5.25% NaOCl or 2% CHX gel was used. For smear layer removal, 17% ethylenediaminetetraacetic acid (EDTA) or QMix 2 in 1 was applied for 3 min. As final irrigant, 1 mL of NaOCl, CHX solution or distilled water was used. On conclusion of preparation, canals were filled with gutta-percha/AH Plus sealer. Bond strength was measured by the push-out test. Data were statistically analysed by Kruskal-Wallis and Mann-Whitney U-tests. The group NaOCl/EDTA/NaOCl showed significantly higher bond strength values than other groups. In all groups, there were mainly mixed failure patterns. It can be concluded that 5.25% NaOCl proved to be the best solution for the final irrigation when combined with EDTA. The final irrigation protocols affect the push-out bond strength of AH Plus to dentin.
authors.affiliation: Department of Endodontics, UERJ - State University of Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Fernanda
authors.initials: F
authors.lastname: Leal
authors.affiliation: Department of Metallurgic and Materials Engineering, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Renata Antoun
authors.initials: RA
authors.lastname: Simão
authors.affiliation: Department of Endodontics, UERJ - State University of Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Sandra Rivera
authors.initials: SR
authors.lastname: Fidel
authors.affiliation: Department of Endodontics, UERJ - State University of Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Rivail Antônio Sérgio
authors.initials: RA
authors.lastname: Fidel
authors.affiliation: Department of Metallurgic and Materials Engineering, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
authors.forename: Maíra
authors.initials: M
authors.lastname: do Prado
mesh_terms: D001840:Dental Bonding; D003786:Dental Pulp Cavity; D003799:Dental Stress Analysis; D003804:Dentin; D004492:Edetic Acid; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D018915:Root Canal Preparation; D012973:Sodium Hypochlorite
chemical_list: D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; D004492:Edetic Acid; D012973:Sodium Hypochlorite
keywords: EDTA; QMix root canal irrigant; chlorhexidine; dental bonding; sodium hypochlorite