title: Bond strength of self-adhesive resin cements to composite submitted to different surface pretreatments.
abstract: OBJECTIVE
  Extensively destroyed teeth are commonly restored with composite resin before cavity preparation for indirect restorations. The longevity of the restoration can be related to the proper bonding of the resin cement to the composite. This study aimed to evaluate the microshear bond strength of two self-adhesive resin cements to composite resin.
  
  
  METHODS
  COMPOSITE DISCS WERE SUBJECT TO ONE OF SIX DIFFERENT SURFACE PRETREATMENTS: none (control), 35% phosphoric acid etching for 30 seconds (PA), application of silane (silane), PA + silane, PA + adhesive, or PA + silane + adhesive (n = 6). A silicone mold containing a cylindrical orifice (1 mm(2) diameter) was placed over the composite resin. RelyX Unicem (3M ESPE) or BisCem (Bisco Inc.) self-adhesive resin cement was inserted into the orifices and light-cured. Self-adhesive cement cylinders were submitted to shear loading. Data were analyzed by two-way ANOVA and Tukey's test (p < 0.05).
  
  
  RESULTS
  Independent of the cement used, the PA + Silane + Adhesive group showed higher microshear bond strength than those of the PA and PA + Silane groups. There was no difference among the other treatments. Unicem presented higher bond strength than BisCem for all experimental conditions.
  
  
  CONCLUSIONS
  Pretreatments of the composite resin surface might have an effect on the bond strength of self-adhesive resin cements to this substrate.
authors: Department of Dentistry, Federal University of Sergipe, Aracaju, SE, Brazil.
authors: Victor Hugo
authors: VH
authors: Dos Santos
authors: Department of Materials Science and Engineering, Federal University of Sergipe, São Cristóvão, SE, Brazil.
authors: Sandro
authors: S
authors: Griza
authors: Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil.
authors: Rafael Ratto
authors: RR
authors: de Moraes
authors: Department of Dentistry, Federal University of Sergipe, Aracaju, SE, Brazil.
authors: André Luis
authors: AL
authors: Faria-E-Silva
keywords: Composite resins; Resin cements; Shear strength