title: Effect of calcium hydroxide dressing on push-out bond strength of endodontic sealers to root canal dentin.
abstract: The aim of the present study was to evaluate the effect of calcium hydroxide dressing on the bond strength of three commercially available endodontic sealers (MTA Fillapex, Sealapex, and AH Plus) to root canal dentin. Sixty slices of extracted human canines were obtained from cervical, middle, and apical root thirds. Root canals were standardized and specimens were filled and divided into six groups (n = 10): G1, MTA Fillapex; G2, Sealapex; and G3, AH Plus, with prior application of calcium hydroxide dressing; and G4, G5 and G6, without prior application of intracanal dressing. After 7 days, specimens were submitted to a push-out test. The data obtained were analyzed using the ANOVA and Tukey tests (α = 5%). Fracture modes were classified as adhesive, cohesive or mixed. The results of sealer bond strength to root canal dentin varied according to the sealer, root third and prior dressing application. Overall, calcium hydroxide dressing reduced bond strength in all root thirds, but the reduction was significant only for AH Plus, at the cervical (3.25 ± 1.69) and apical (4.43 ± 1.65) thirds (p < 0.05). AH Plus showed the highest bond strength for all root thirds (p < 0.05) compared to the other groups. G1, G2, G4 and G5 showed similar bond strength values for all root thirds (p > 0.05). In conclusion, the calcium hydroxide dressing only had a negative effect on the bond strength of AH Plus, at the cervical and apical thirds. On the other hand, the bond strength values for MTA Fillapex and Sealapex were lower than those for AH Plus and, whereas the mixed failure mode predominated for AH Plus, the adhesive failure mode predominated for MTA Fillapex and Sealapex.
authors.forename: Flávia Angélica
authors.initials: FA
authors.lastname: Guiotti
authors.forename: Milton Carlos
authors.initials: MC
authors.lastname: Kuga
authors.forename: Marco Antonio Hungaro
authors.initials: MA
authors.lastname: Duarte
authors.forename: Arnaldo Júnior
authors.initials: AJ
authors.lastname: Sant'Anna
authors.forename: Gisele
authors.initials: G
authors.lastname: Faria
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry; D000704:Analysis of Variance; D001843:Bone Cements / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry; D002126:Calcium Hydroxide / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D003786:Dental Pulp Cavity / Q000187:drug effects*; D019232:Dental Restoration Failure; D003804:Dentin / Q000187:drug effects*; D004338:Drug Combinations; D004853:Epoxy Resins / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry; D012016:Reference Values; D015203:Reproducibility of Results; D012387:Root Canal Filling Materials / Q000737:chemistry*; D018915:Root Canal Preparation / Q000379:methods; D012459:Salicylates / Q000737:chemistry; D017640:Silicates / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors
chemical_list: D017607:Aluminum Compounds; D001843:Bone Cements; D017610:Calcium Compounds; D004338:Drug Combinations; D004853:Epoxy Resins; D010087:Oxides; D012387:Root Canal Filling Materials; D012459:Salicylates; D017640:Silicates; C534916:epoxy resin-based root canal sealer; C086631:mineral trioxide aggregate; C055601:Sealapex; D002126:Calcium Hydroxide