title: Influence of surface treatments to repair recent fillings of silorane-and methacrylate-based composites.
abstract: OBJECTIVE
  The aim of this study was to evaluate the tensile bond strength (TBS) of repairs in recent fillings of methacrylate- (MBC) or silorane-based composites (SBC) subsequent to different surface treatments.
  
  
  METHODS
  Fifty slabs of Filtek P60 (3M ESPE, St Paul, USA) and Filtek P90 (3M ESPE) were stored for 10 days in distilled water at 37°C. The surface of adhesion was abraded with a 600-grit silicone paper and repaired using each respective composite: G1, no treatment (control); G2, application of adhesive; G3, application of silane and adhesive; G4, sandblasting (Al2O3) and adhesive; and G5, sandblasting (Al2O3), silane, and adhesive. Further 10 slabs of each composite were also evaluated for cohesive strength (G6). After 30 days immersion in distilled water at 37°C, the TBS was determined.
  
  
  RESULTS
  TBS results were higher for MBC than for SBC (P = 0.00012). The experimental groups were similar for SBC and the TBS was 27% of its cohesive strength. For P60, sandblasting significantly improved the TBS compared to other groups. With MBC, G4 and G5, the TBS was approximately 47% of its cohesive strength.
  
  
  CONCLUSIONS
  Sandblasting (Al2O3) improves the repair-strength of MBC, whilst for the SBC all treatments succeed. MBC presents higher repair strength than SBC.
authors.affiliation: Departments of Prosthodontics and Periodontics, Restorative Dentistry, Campinas State University, Campinas, São Paulo, Brazil.
authors.forename: Marina
authors.initials: M
authors.lastname: Kaneko
authors.affiliation: Departments of Prosthodontics and Periodontics, Restorative Dentistry, Campinas State University, Campinas, São Paulo, Brazil.
authors.forename: Ricardo Armini
authors.initials: RA
authors.lastname: Caldas
authors.affiliation: Departments of Prosthodontics and Periodontics, Restorative Dentistry, Campinas State University, Campinas, São Paulo, Brazil.
authors.forename: Victor Pinheiro
authors.initials: VP
authors.lastname: Feitosa
authors.affiliation: Departments of Prosthodontics and Periodontics, Restorative Dentistry, Campinas State University, Campinas, São Paulo, Brazil.
authors.forename: Rafael Leonardo
authors.initials: RL
authors.lastname: Xediek Consani
authors.affiliation: Department of Restorative Dentistry, Veiga de Almeida University, Rio de Janeiro, Brazil.
authors.forename: Luis Felipe J
authors.initials: LF
authors.lastname: Schneider
authors.affiliation: Departments of Prosthodontics and Periodontics, Restorative Dentistry, Campinas State University, Campinas, São Paulo, Brazil.
authors.forename: Ataís
authors.initials: A
authors.lastname: Bacchi
keywords: Composite resin; dental restoration permanent; dental restoration repair