title: Microleakage and microtensile bond strength of silorane-based and dimethacrylate-based restorative systems.
abstract: OBJECTIVE
  To evaluate the microleakage and bond strengths (microTBS) of silorane-based (SBC) and dimethacrylate-based (DBC) restorative systems. The null hypotheses are: 1) there is no difference in microleakage between the resin composites and the adhesive systems tested at the enamel and dentin margins; 2) there is no significant difference in microTBS between the composite restorative systems using self-etch and etch-and-rinse adhesive versions.
  
  
  METHODS
  Microleakage: Class V cavity preparations with cervical margin in dentin were performed on pristine extracted human molars and were randomly distributed among the following three groups: Group 1-DBC/etch-and-rinse adhesive system (Filtek™ Supreme Ultra/Adper™ Single Bond Plus, 3M ESPE, www.3MESPE.com); Group 2-SBC/self-etch adhesive (Filtek LS Low Shrink Posterior Restorative System/LS self-etch adhesive, 3M ESPE); Group 3-DBC/self-etch adhesive (Filtek Supreme Ultra/ Adper Easy Bond Self-Etch, 3M ESPE). Restorations were thermocycled and immersed in 0.2 percent methylene blue dye for 24 hours. Samples were assessed visually under 10x magnification; microTBS: Bond sticks (0.9 mm2) were prepared from each group and tested on a universal testing machine.
  
  
  RESULTS
  The Kruskal-Wallis test revealed no significant difference in microleakage among the experimental groups at the enamel margin (P=0.191). At the dentin margins, silorane/self-etch restorative system showed significantly less leakage than the dimethacrylate/etch-and-rinse restorative system (P=0.008). Tukey's B rank order test showed that the dimethacrylate/etch-and-rinse restorative system presented the highest microTBS.
  
  
  CONCLUSIONS
  SBC/self-etch system showed less microleakage at the dentin margins, while DBC/etch-and-rinse system presented higher bond strength.
authors.affiliation: Assistant Professor, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada.
authors.forename: Maria Jacinta Moraes Coelho
authors.initials: MJ
authors.lastname: Santos
authors.affiliation: Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada.
authors.forename: Aaron
authors.initials: A
authors.lastname: Podorieszach
authors.affiliation: Associate Professor, Chair of the Division of Biomaterials Science, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada.
authors.forename: Amin Sami
authors.initials: AS
authors.lastname: Rizkalla
authors.affiliation: Associate Professor, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada.
authors.forename: Gildo Coelho
authors.initials: GC
authors.lastname: Santos
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D003737:Dental Cavity Preparation; D003738:Dental Cements / Q000737:chemistry*; D003763:Dental Leakage / Q000145:classification*; D003793:Dental Restoration, Permanent / Q000379:methods*; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D008963:Molar; D062047:Silorane Resins / Q000737:chemistry*; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: C554641:Adper single bond 2; D003188:Composite Resins; D003738:Dental Cements; C543062:Filtek LS Low Shrink resin; C000590992:Filtek Supreme Ultra; D062047:Silorane Resins