title: Bond strength to radicular dentin and sealing ability of AH Plus in combination with a bonding agent.
abstract: OBJECTIVE
  To evaluate the sealing ability and bond strength of AH Plus sealer associated with the hybridization protocol of radicular dentin with Scotchbond Multi Purpose (SB).
  
  
  METHODS
  Ninety palatal roots of maxillary molars were selected and divided into three groups (n = 30) according to filling protocol (G1, AH Plus/Resilon; G2, SB/AH Plus/Resilon; and G3, AH Plus/Gutta-Percha). In groups in which AH Plus + resin cones were used, dentin was hybridized before applying sealing material. For the bond strength test, 60 roots of bovine teeth were selected. Six holes were made in each root, two in the cervical, middle and apical third of the root. The roles were filled with AH Plus sealer with or without an adhesive system and submitted to push out test and the fracture mode was examined using a stereomicroscope (×32).
  
  
  RESULTS
  Statistical analysis showed that ScotchBond Multi Purpose (SB) + Resilon cone + AH Plus group promoted higher sealing ability than the gutta-percha + AH Plus group (p < 0.05). Bond strength was lower with SB application than without it (p < 0.05). A reverse correlation was found between bond strength and sealing ability. The fracture mode methodology revealed 22.77% of adhesive, 11.67% of cohesive and 65.55% of mixture fractures for SBMP/AH Plus protocol, whereas the AH Plus protocol indicated 86.11% of cohesive and 13.89% of mixed fractures.
  
  
  CONCLUSIONS
  It was concluded that the use of the adhesive system Scotchbond Multi Purpose improved coronal sealing ability of AH Plus, but bond strength of sealer was reduced when adhesive was applied.
authors.affiliation: Endodontics Department, UESB, Brazil.
authors.forename: Carlos V
authors.initials: CV
authors.lastname: Andrade-Júnior
authors.forename: Shaiana T
authors.initials: ST
authors.lastname: Kawagoe
authors.forename: José Flávio A
authors.initials: JF
authors.lastname: Almeida
authors.forename: Brenda P F A
authors.initials: BP
authors.lastname: Gomes
authors.forename: Alexandre A
authors.initials: AA
authors.lastname: Zaia
authors.forename: Caio C R
authors.initials: CC
authors.lastname: Ferraz
mesh_terms: D000818:Animals; D002417:Cattle; D001840:Dental Bonding / Q000379:methods*; D003804:Dentin / Q000737:chemistry*; D014092:Tooth Root