title: Degradation of resin-dentine bond of different adhesive systems to primary and permanent dentine.
abstract: OBJECTIVE
  To evaluate the water storage degradation of resin-dentine bonds of different adhesive systems to primary and permanent human dentine.
  
  
  METHODS
  Flat occlusal human dentine surfaces of 15 primary molars and 15 permanent molars were randomly assigned according to adhesive systems: Adper Single Bond 2; Clearfil SE Bond and One Up Bond F Plus. After bonding procedures, the adhesives were applied according to the manufacturers' instructions and composite resin blocks were built. Restored teeth were sectioned rendering rectangular sticks (RS) (0.4 mm2). The RS were submitted to microtensile bond strength (µTBS) test according to the water storage time: 24 h, 1-year, and 2-years. Mean µTBS values were analysed by three-way analysis of variance (mixed design) and Tukey post hoc test (α = 0.05). The failure mode was analysed at 400× magnification.
  
  
  RESULTS
  All three factors isolated showed significant influences on µTBS, as did the cross-product interactions between material vs. storage time (p = 0.01) and substrate vs. storage time (p = 0.002). Bond strength means to primary dentine were lower than to permanent dentine (34.7 ± 10.1 and 45.8 ± 12.9 mPa, respectively) after 2-years of water storage. The one-step self-etch adhesive (One Up Bond F Plus) showed less stable bond strength after 2-years of water storage.
  
  
  CONCLUSIONS
  The resin-dentine bond of primary teeth was more prone to degradation over time compared to permanent dentine.
authors.affiliation: Department of Restorative Dentistry, Federal University of Santa Maria, Santa Maria, RS, Brazil.
authors.forename: F Z M
authors.initials: FZ
authors.lastname: Soares
authors.affiliation: Graduate Program in Dental Science, Federal University of Santa Maria, Santa Maria, RS, Brazil.
authors.forename: T L
authors.initials: TL
authors.lastname: Lenzi
authors.affiliation: Department of Stomatology, Federal University of Santa Maria, Rua Marechal Floriano Peixoto, 1184, Santa Maria, RS, 97015-270, Brazil. rachelrocha@smail.ufsm.br.
authors.forename: R
authors.initials: R
authors.lastname: de Oliveira Rocha
mesh_terms: D001840:Dental Bonding; D003804:Dentin / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D012117:Resins, Synthetic / Q000737:chemistry*; D013718:Tensile Strength
chemical_list: D017220:Dentin-Bonding Agents; D012117:Resins, Synthetic
keywords: Bond strength; Dentine; Permanent teeth; Primary teeth