title: Bond Strength of a Novel One Bottle Multi-mode Adhesive to Human Dentin After Six Months of Storage.
abstract: OBJECTIVE
  The aim of the study was to evaluate the microtensile bond strength (µTBS) of Scotchbond Universal to dentin using the etch-and-rinse or the self-etch technique after 24 h and 6 months of storage.
  
  
  METHODS
  Flat dentin surfaces were obtained in 24 third molars. The teeth were divided into four groups: G1 - Scotchbond Universal applied in the etch-and-rinse mode; G2 - Scotchbond Universal applied in the self-etch mode; G3 - Scotchbond Multi-Purpose; G4 - Clearfil SE Bond. A block of composite was built on the adhesive area. The tooth/resin sets were cut parallel to the long axis to obtain 40 beams (~0.8 mm(2)) for each group. Twenty specimens were immediately submitted to the µTBS test, and the remaining 20 were stored in water for 6 months. Failures and the adhesive interface were analyzed by SEM.
  
  
  RESULTS
  According to two-way ANOVA, the interaction between adhesive and storage time was significant (p=0.015).The µTBS (MPa) means were the following: 24 h - G1 (39.37±10.82), G2 (31.02±13.76), G3 (35.09±14.03) and G4 (35.84±11.06); 6 months - G1 (36.99±8.78), G2 (40.58±8.07), G3 (32.44±6.07) and G4 (41.75±8.25). Most failures were mixed. Evidence of hybrid layer and numerous resin tags were noted for Scotchbond Universal applied with the etch-and-rinse mode and Scotchbond Multi-Purpose. A thinner hybrid layer and fewer resin tags were noted for Scotchbond Universal applied in the self-etch mode and Clearfil SE Bond.
  
  
  CONCLUSIONS
  The results indicate that the µTBS for Scotchbond Universal is comparable to the gold-standard adhesives. Scotchbond Universal applied in the self-etch mode and Clearfil SE Bond revealed higher bond stability compared to the etch-and-rinse mode.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil.
authors.forename: Fernanda Borguetti
authors.initials: FB
authors.lastname: Manfroi
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil.
authors.forename: Maurem Leitão
authors.initials: ML
authors.lastname: Marcondes
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil.
authors.forename: Deise Caren
authors.initials: DC
authors.lastname: Somacal
authors.affiliation: Department of Restorative Dentistry, Uberaba University, Uberaba, Brazil.
authors.forename: Gilberto Antonio
authors.initials: GA
authors.lastname: Borges
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil.
authors.forename: Luiz Henrique Burnett
authors.initials: LH
authors.lastname: Júnior
authors.affiliation: Department of Dental Materials, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil.
authors.forename: Ana Maria
authors.initials: AM
authors.lastname: Spohr
keywords: Adhesive systems; Bond strength; Dentin; Interface; Microtensile; Storage