title: Shear bond strength of three resin based sealers to dentin with and without the smear layer.
abstract: Bond strength of root canal sealers to dentin is an important property for the integrity of the sealings of root-canals. The purpose of this study was to test shear bond strength of three endodontic sealers (Diaket, AH Plus and Endo-REZ). The coronal two thirds of ninety extracted human third molars were removed. The smear layer of the exposed dentin surfaces were removed using 17% EDTA followed by 5.25% NaOCl and the teeth were randomly divided into two groups (n = 45). Group 1 was kept as control and in group 2, uniform smear layer was created using waterproof polishing papers. Three-mm long sections of polyethylene tubing were filled with freshly mixed sealer and placed on the dentin surfaces for conducting a shear bond strength test. The data was calculated as MPa and was statistically analyzed using a two way ANOVA, Kruskal-Wallis and Mann-Whitney U tests. A significant difference was found among the bond strength of the sealers, smear layer, and control groups. AH Plus sealer showed the highest bond strength in smear layer removed surfaces (p < 0.05). Pretreatment with EDTA/NaOCl affected bond strength of AH Plus. AH Plus had the highest bond to dentin with or without smear layer.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, University of Selcuk, Konya, Turkey. ayce71@hotmail.com
authors.forename: Ayce Unverdi
authors.initials: AU
authors.lastname: Eldeniz
authors.forename: Ali
authors.initials: A
authors.lastname: Erdemir
authors.forename: Sema
authors.initials: S
authors.lastname: Belli
mesh_terms: D000704:Analysis of Variance; D001729:Bismuth; D003188:Composite Resins; D001840:Dental Bonding; D003786:Dental Pulp Cavity; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; D004853:Epoxy Resins; D006801:Humans; D008422:Materials Testing; D008963:Molar; D011145:Polyvinyls; D011897:Random Allocation; D019279:Resin Cements; D012387:Root Canal Filling Materials; D033081:Shear Strength; D016369:Smear Layer; D018709:Statistics, Nonparametric; D015034:Zinc Oxide
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D004338:Drug Combinations; C481259:EndoRez; D004853:Epoxy Resins; D011145:Polyvinyls; D019279:Resin Cements; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; C014457:bismuth phosphate, copolymers of vinyl acetate, dichlorophen, propionyl-acetophenone, triethanolamine, vinyl chloride, vinylisobutyl ether, zinc oxide drug combination; D015034:Zinc Oxide; D001729:Bismuth