title: Evaluating resin-enamel bonds by microshear and microtensile bond strength tests: effects of composite resin.
abstract: OBJECTIVE
  The aims of this study were to evaluate the effect of resin composite (Filtek Z250 and Filtek Flow Z350) and adhesive system [(Solobond Plus, Futurabond NR (VOCO) and Adper Single Bond (3M ESPE)] on the microtensile (μTBS) and microshear bond strength (μSBS) tests on enamel, and to correlate the bond strength means between them.
  
  
  METHODS
  Thirty-six extracted human molars were sectioned to obtain two tooth halves: one for μTBS and the other one for μSBS. Adhesive systems and resin composites were applied to the enamel ground surfaces and light-cured. After storage (37(0)C/24 h) specimens were stressed (0.5 mm/min). Fracture modes were analyzed under scanning electron microscopy. The data were analyzed using two-way ANOVA and Tukey's test (α=0.05).
  
  
  RESULTS
  The correlation between tests was estimated with Pearson's product-moment correlation statistics (α =0.05). For both tests only the main factor resin composite was statistically significant (p<0.05). The correlation test detected a positive (r=0.91) and significant (p=0.01) correlation between the tests.
  
  
  CONCLUSIONS
  The results were more influenced by the resin type than by the adhesives. Both microbond tests seem to be positive and linearly correlated and can therefore lead to similar conclusions.
authors.affiliation: Dental School, Department of Dental Materials, University of São Paulo, São Paulo, SP, Brazil.
authors.forename: Andrea Mello de
authors.initials: AM
authors.lastname: Andrade
authors.forename: Sandra Kiss
authors.initials: SK
authors.lastname: Moura
authors.forename: Alessandra
authors.initials: A
authors.lastname: Reis
authors.forename: Alessandro Dourado
authors.initials: AD
authors.lastname: Loguercio
authors.forename: Eugenio Jose
authors.initials: EJ
authors.lastname: Garcia
authors.forename: Rosa Helena Miranda
authors.initials: RH
authors.lastname: Grande
mesh_terms: D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000737:chemistry*; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D033081:Shear Strength; D013718:Tensile Strength
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C115612:single bond; D017438:Bisphenol A-Glycidyl Methacrylate