title: Evaluation of marginal microleakage in class II cavities: effect of microhybrid, flowable, and compactable resins.
abstract: OBJECTIVE
  The goal of the present study was to evaluate the microleakage on the cementum/dentin and enamel surfaces in Class II restorations, using different kinds of resin composite (microhybrid, flowable, and compactable).
  
  
  METHODS
  Forty human caries-free molars were extracted and selected. Eighty Class II standardized cavities were made in the cervical wall at the cementoenamel junction (CEJ) and at the mesial and distal surfaces. The teeth were divided into four groups: G1--adhesive system + microhybrid resin composite Z100; G2--adhesive system + compactable resin composite Prodigy Condensable; G3--adhesive system + flowable resin composite Revolution + Z100 resin composite; G4--adhesive system + Revolution fluid resin + compactable resin composite Prodigy Condensable. The adhesive system used in this study was Scotchbond Multi-Purpose Plus. The specimens were thermocycled in baths of 5 degrees C and 55 degrees C for 1,000 cycles and immersed in 50% silver nitrate solution. The specimens then were sectioned and evaluated on degree of dye penetration.
  
  
  RESULTS
  The results were evaluated using the nonparametric Kruskall-Wallis test, which showed a statistically significant difference between groups G1 and G4, G2 and G4, and G3 and G4.
  
  
  CONCLUSIONS
  None of the materials was able to eliminate the marginal microleakage at the cervical wall; the application of a low-viscosity resin composite combined with a compactable resin composite significantly decreased the microleakage.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry of Piracicaba, State University of Campinas, São Paulo, Brazil.
authors.forename: Alessandra Rezende
authors.initials: AR
authors.lastname: Peris
authors.forename: Sillas
authors.initials: S
authors.lastname: Duarte
authors.forename: Marcelo Ferrarezi
authors.initials: MF
authors.lastname: de Andrade
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D003737:Dental Cavity Preparation / Q000379:methods*; D003763:Dental Leakage / Q000517:prevention & control*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D006801:Humans; D008963:Molar; D011897:Random Allocation; D019279:Resin Cements; D012822:Silicon Dioxide; D018709:Statistics, Nonparametric; D014783:Viscosity; D015040:Zirconium
chemical_list: D003188:Composite Resins; C099128:Prodigy; D019279:Resin Cements; C102735:Revolution (composite resin); C425844:Scotchbond Multi-Purpose Plus; C083568:Z100 composite resin; D012822:Silicon Dioxide; D015040:Zirconium