title: Bond strength of adhesives to dentin involving total and self-etch adhesives.
abstract: OBJECTIVE
  Currently, the trend in dentin adhesion seems to be shifting from moist bonding systems to self-etching systems and from several application steps to single steps. However, recent studies have indicated that the performance of single-step adhesives was lower than the 2-step self-etch or total etch systems. In the present study, microtensile bond strength of a total etch, 2-step self-etch and single-step self-etch adhesives was comparatively evaluated.
  
  
  METHODS
  The superficial occlusal dentin of 12 noncarious extracted human molars was exposed, finished with wet 600-grit silicon carbide paper, and a block of resin composite bonded with adhesives according to the manufacturers' instructions. The teeth were kept in tap water for 24 hours at 37 degrees C and sectioned to produce beams, with adhesive areas of +/- 0.9 mm2 (4 beams per tooth were obtained). The specimens were stressed at a crosshead speed of 1 mm per minute until the bonds ruptured.
  
  
  RESULTS
  The mean bond strengths were calculated as MPa and compared by performing analysis of variance and Tukey tests to identify significant differences between the materials (P = 0.05). The mean bond strength of Clearfil SE Bond was significantly higher than that of OptiBond Solo Plus and iBond (P <.05). OptiBond Solo Plus gave significantly higher bond strengths than iBond (P <.05).
  
  
  CONCLUSIONS
  The self-etching adhesive system Clearfil SE Bond (2 step) had higher bond strength than the 1-bottle self-etching adhesive iBond (single application) and the 2-step single-bottle system OptiBond Solo Plus (total etch). However, the 1-bottle adhesive system OptiBond Solo Plus (total etch system) had higher bond strength than the 1-bottle self-etching adhesive system iBond.
authors.affiliation: Institute of Odontological Clinic, University of Ferrara, Italy. hurmuzlu@cumhuriyet.edu.tr
authors.forename: Feridun
authors.initials: F
authors.lastname: Hürmüzlü
authors.forename: A Kemal
authors.initials: AK
authors.lastname: Ozdemir
authors.forename: Ihsan
authors.initials: I
authors.lastname: Hubbezoglu
authors.forename: Akin
authors.initials: A
authors.lastname: Coskun
authors.forename: Seyda Hergüner
authors.initials: SH
authors.lastname: Siso
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000704:Analysis of Variance; D001840:Dental Bonding / Q000379:methods*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D013718:Tensile Strength
chemical_list: D017220:Dentin-Bonding Agents