title: Bonding stability of adhesive systems to eroded dentin.
abstract: This in vitro study evaluated the immediate and 6 months microshear bond strength (µSBS) of different adhesive systems to sound and eroded dentin. Sixty bovine incisors were embedded in acrylic resin and ground to obtain flat buccal dentin surfaces. Specimens were randomly allocated into two groups: sound dentin (immersion in artificial saliva) and eroded dentin (erosive challenge following a pH cycling model comprising 4 ×/day Sprite Light® drink for 10 days). Then, specimens were reassigned according to the adhesive system: etch-and-rinse adhesive (Adper Single Bond), two-step self-etch system (Clearfil SE Bond), or one-step self-etch adhesive (Adper Easy One). Polyethylene tubes with an internal diameter of 0.76 mm were placed over pre-treated dentin and filled with resin composite (Z250). Half of the specimens were evaluated by the µSBS test after 24 h, and the other half 6 months later, after water storage at 37 °C. Failure mode was evaluated using a stereomicroscope (400 ×). Data were analyzed by three-way repeated measures analysis of variance and Tukey's post hoc tests (α = 0.05). After 6 months of water aging, marked reductions in µSBS values were observed, irrespective of the substrate. The µSBS values for eroded dentin were lower than those obtained for sound dentin. No difference in bonding effectiveness was observed among adhesive systems. For all groups, adhesive/mixed failure was observed. In conclusion, eroded dentin compromises the bonding quality of adhesive systems over time.
authors.affiliation: Centro de Pesquisas Odontológicas, School of Dentistry, Faculdade São Leopoldo Mandic, Campinas, SP, Brazil.
authors.forename: Janaina Barros
authors.initials: JB
authors.lastname: Cruz
authors.affiliation: Centro de Pesquisas Odontológicas, School of Dentistry, Faculdade São Leopoldo Mandic, Campinas, SP, Brazil.
authors.forename: Gabriela
authors.initials: G
authors.lastname: Bonini
authors.affiliation: School of Dentistry, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
authors.forename: Tathiane Larissa
authors.initials: TL
authors.lastname: Lenzi
authors.affiliation: Department of Orthodontics and Pediatric Dentistry, School of Dentistry, Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: José Carlos Pettorossi
authors.initials: JC
authors.lastname: Imparato
authors.affiliation: Department of Orthodontics and Pediatric Dentistry, School of Dentistry, Universidade de São Paulo, São Paulo, SP, Brazil.
authors.forename: Daniela Prócida
authors.initials: DP
authors.lastname: Raggio
mesh_terms: D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements / Q000737:chemistry*; D019232:Dental Restoration Failure; D003804:Dentin / Q000187:drug effects*; D008422:Materials Testing; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry; D012464:Saliva, Artificial / Q000737:chemistry; D033081:Shear Strength / Q000187:drug effects; D013499:Surface Properties / Q000187:drug effects; D013997:Time Factors; D014077:Tooth Erosion; D014867:Water / Q000737:chemistry
chemical_list: C438313:Clearfil SE Bond; D003188:Composite Resins; D003738:Dental Cements; D019279:Resin Cements; D012464:Saliva, Artificial; D014867:Water