title: Bonding efficacy of new self-etching, self-adhesive dual-curing resin cements to dental enamel.
abstract: OBJECTIVE
  This study evaluated the efficacy of the union between two new self-etching self-adhesive resin cements and enamel using the microtensile bond strength test.
  
  
  METHODS
  Buccal enamel of 80 bovine teeth was submitted to finishing and polishing with metallographic paper to a refinement of #600, in order to obtain a 5-mm2 flat area. Blocks (2 x 4 x 4 mm) of laboratory composite resin were cemented to enamel according to different protocols: (1) untreated enamel + RelyX Unicem cement (RX group); (2) untreated enamel + Bifix SE cement (BF group); (3) enamel acid etching and application of resin adhesive Single Bond + RelyX Unicem (RXA group); (4) enamel acid etching and application of resin adhesive Solobond M + Bifix SE (BFA group). After 7 days of storage in distillated water at 37°C, the blocks were sectioned for obtaining microbar specimens with an adhesive area of 1 mm2 (n = 120). Specimens were submitted to the microtensile bond strength test at a crosshead speed of 0.5 mm/min. The results (in MPa) were analyzed statistically by ANOVA and Tukey's test.
  
  
  RESULTS
  Enamel pre-treatment with phosphoric acid and resin adhesive (27.9 and 30.3 for RXA and BFA groups) significantly improved (p ≤ 0.05) the adhesion of both cements to enamel compared to the union achieved with as-polished enamel (9.9 and 6.0 for RX and BF).
  
  
  CONCLUSIONS
  Enamel pre-treatment with acid etching and the application of resin adhesive significantly improved the bond efficacy of both luting agents compared to the union achieved with as-polished enamel.
authors: Department of Dental Materials and Prosthodontics, Sao Paulo State University, Sao Paulo, Brazil. paula_benetti@hotmail.com
authors: Paula
authors: P
authors: Benetti
authors: Virgílio Vilas
authors: VV
authors: Fernandes
authors: Carlos Rocha
authors: CR
authors: Torres
authors: Clovis
authors: C
authors: Pagani
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000818:Animals; D002417:Cattle; D003188:Composite Resins; D001840:Dental Bonding; D003743:Dental Enamel; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D008422:Materials Testing; D019279:Resin Cements; D055116:Self-Curing of Dental Resins; D013718:Tensile Strength
chemical_list: C515607:Bifix composite; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C483701:Rely X Unicem; D019279:Resin Cements