title: Effect of indirect composite treatment microtensile bond strength of self-adhesive resin cements.
abstract: BACKGROUND
  No specific indications about the pre-treatment of indirect composite restorations is provided by the manufacturers of most self-adhesive resin cements. The potential effect of silane treatment to the bond strength of the complete tooth/indirect restoration complex is not available.The aim of this study was to determine the contribution of different surface treatments on microtensile bond strength of composite overlays to dentin using several self-adhesive resin cements and a total-etch one.
  
  
  METHODS
  Composite overlays were fabricated and bonding surfaces were airborne-particle abraded and randomly assigned to two different surface treatments: no treatment or silane application (RelyX Ceramic Primer) followed by an adhesive (Adper Scotchbond 1 XT). Composite overlays were luted to flat dentin surfaces using the following self-adhesive resin cements: RelyX Unicem, G-Cem, Speedcem, Maxcem Elite or Smartcem2, and the total-etch resin cement RelyX ARC. After 24 h, bonded specimens were cut into sticks 1 mm thick and stressed in tension until failure. Two-way ANOVA and SNK tests were applied at α=0.05.
  
  
  RESULTS
  Bond strength values were significantly influenced by the resin cement used (p<0.001). However, composite surface treatment and the interaction between the resin cement applied and surface treatment did not significantly affect dentin bond strength (p>0.05). All self-adhesive resin cements showed lower bond strength values than the total-etch RelyX ARC. Among self-adhesive resin cements, RelyX Unicem and G-Cem attained statistically higher bond strength values. Smartcem2 and Maxcem Elite exhibited 80-90% of pre-test failures.
  
  
  CONCLUSIONS
  The silane and adhesive application after indirect resin composite sandblasting did not improve the bond strength of dentin-composite overlay complex. Selection of the resin cement seems to be a more relevant factor when bonding indirect composites to dentin than its surface treatment.
  
  
  BACKGROUND
  Bond strength, self-adhesive cement, silane, dentin, indirect composite.
authors: Assistant Professor, Department of Stomatology and Nursing, Health Sciences Faculty, Rey Juan Carlos University, Alcorcón, Spain.
authors: María-Victoria
authors: MV
authors: Fuentes
authors: Assistant Professor, Department of Stomatology and Nursing, Health Sciences Faculty, Rey Juan Carlos University, Alcorcón, Spain.
authors: Nuria
authors: N
authors: Escribano
authors: Assistant Professor, Department of Stomatology and Nursing, Health Sciences Faculty, Rey Juan Carlos University, Alcorcón, Spain.
authors: Bruno
authors: B
authors: Baracco
authors: Associate Professor, Department of Stomatology and Nursing, Health Sciences Faculty, Rey Juan Carlos University, Alcorcón, Spain.
authors: Martin
authors: M
authors: Romero
authors: Associate Professor, Department of Stomatology and Nursing, Health Sciences Faculty, Rey Juan Carlos University, Alcorcón, Spain.
authors: Laura
authors: L
authors: Ceballos