title: Effect of 180-Day Water Storage on Bonding Effectiveness of Self-Adhesive Systems to Occlusal and Proximal Dentin.
abstract: OBJECTIVE
  This study aimed to evaluate the microshear bond strength (μSBS) values of adhesive systems to occlusal and proximal dentin submitted to water storage aging.
  
  
  METHODS
  Occlusal and proximal dentin surfaces were obtained from 90 molars, polished with 600-grit SiC and divided according to the type of adhesive system: one total-etch and two self-etch. Starch tubing was used to perform 1 mm2cylindrical composite resin restorations. The specimens were aged in distilled water during different storage times: 24 hours, 3 months, and 6 months (n = 10). The specimens were submitted to μSBS test. The μSBS values in MPa were subject to three-way ANOVA and post hoc Tukey test (p < 0.05).
  
  
  RESULTS
  There was no statistical difference in the μSBS values among the storage times (p = 0.72); however, the dentin region (p < 0.01) and the adhesive system (p < 0.01) significantly affected the μSBS. The proximal surface (14.7 ± 3.3 MPa) presented higher μSBS values than the occlusal dentin (10.9 ± 4.1 MPa). The all-in-one adhesive system (GB) achieved the highest μSBS mean (17.0 ± 1.7 MPa).
  
  
  CONCLUSIONS
  Both material and dentin surface factors affected the composite-dentin bond strength; however, the water storage did not influence bonding effectiveness over time.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Federal University of Santa Maria, Santa Maria, Brazil.
authors.forename: Anelise Fernandes
authors.initials: AF
authors.lastname: Montagner
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Federal University of Santa Maria, Santa Maria, Brazil.
authors.forename: Jovito Adiel
authors.initials: JA
authors.lastname: Skupien
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Federal University of Santa Maria, Santa Maria, Brazil.
authors.forename: Marciano Freitas
authors.initials: MF
authors.lastname: Borges
authors.affiliation: Division of Cariology and Endodontology, School of Dentistry, University of Geneva, Switzerland.
authors.forename: Ivo
authors.initials: I
authors.lastname: Krejci
authors.affiliation: Division of Cariology and Endodontology, School of Dentistry, University of Geneva, Switzerland.
authors.forename: Tissiana
authors.initials: T
authors.lastname: Bortolotto
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Federal University of Santa Maria, Santa Maria, Brazil.
authors.forename: Alexandre Henrique
authors.initials: AH
authors.lastname: Susin
mesh_terms: D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods; D006801:Humans; D008422:Materials Testing; D008963:Molar; D013997:Time Factors; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water
keywords: Dentin-bonding agent; adhesive system; bond strength; dental bonding; microshear; water storage