title: Bond strength of self-adhesive resin cements to tooth structure.
abstract: OBJECTIVE
  The aim of this study was to evaluate the strength of the bond between newly introduced self-adhesive resin cements and tooth structures (i.e., enamel and dentin).
  
  
  METHODS
  Three self-adhesive cements (SmartCem2, RelyX Unicem, seT SDI) were tested. Cylindrical-shaped cement specimens (diameter, 3 mm; height, 3 mm) were bonded to enamel and dentin. Test specimens were incubated at 37 °C for 24 h. The shear bond strength (SBS) was tested in a Zwick Roll testing machine. Results were analyzed by one-way ANOVA and t-test. Statistically significant differences were defined at the α = 0.05 level. Bond failures were categorized as adhesive, cohesive, or mixed.
  
  
  RESULTS
  The SBS values ranged from 3.76 to 6.81 MPa for cements bonded to enamel and from 4.48 to 5.94 MPa for cements bonded to dentin (p > 0.05 between surfaces). There were no statistically significant differences between the SBS values to enamel versus dentin for any given cement type. All cements exhibited adhesive failure at the resin/tooth interface.
  
  
  CONCLUSIONS
  Regardless of their clinical simplicity, the self-adhesive resin cements examined in this study exhibit limited bond performance to tooth structures; therefore, these cements must be used with caution.
authors.affiliation: Faculty of Dentistry, The University of Jordan, Amman 11942, Jordan.
authors.forename: Susan
authors.initials: S
authors.lastname: Hattar
authors.affiliation: Department of Oral and Maxillofacial Surgery, King's College Hospital, London, UK ; Faculty of Applied Medical Sciences, Jordan University of Science and Technology, Irbid, Jordan.
authors.forename: Muhanad M
authors.initials: MM
authors.lastname: Hatamleh
authors.affiliation: Faculty of Dentistry, The University of Jordan, Amman 11942, Jordan.
authors.forename: Faleh
authors.initials: F
authors.lastname: Sawair
authors.affiliation: Faculty of Dentistry, The University of Jordan, Amman 11942, Jordan.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Al-Rabab'ah
keywords: Cement; Dentin; Enamel; Self-adhesive; Shear bond strength