title: Effect of dual-cure composite resin as restorative material on marginal adaptation of class 2 restorations.
abstract: OBJECTIVE
  The present study attempted to find a simple direct adhesive restorative technique for the restoration of Class 2 cavities.
  
  
  METHODS
  A self-etch adhesive system with a dual-cured core buildup composite resin (paste 1 + paste 2) was evaluated in its ability to restore proximo-occlusal cavities with margins located on enamel and dentin. The groups were: A, cavity filling (cf) with paste 1 (light-curing component) by using a layering technique; B, cf by mixing both pastes, bulk insertion, and dual curing; and C, cf by mixing both pastes, bulk insertion, and chemical curing. Two control groups (D, negative, bulk; and E, positive, layering technique) were included by restoring cavities with a classic three-step etch-and-rinse adhesive and a universal restorative composite resin. SEM margin analysis was performed before and after thermomechanical loading in a chewing simulator.
  
  
  RESULTS
  Percentages (mean ± SD) of "continuous margins" were improved by applying the material in bulk and letting it self cure (54 ± 6) or dual cure (59 ± 9), and no significant differences were observed between these two groups and the positive control (44 ± 19).
  
  
  CONCLUSIONS
  The present study showed that the dual-cured composite resin tested has the potential to be used as bulk filling material for Class 2 restorations.
  
  
  CONCLUSIONS
  When used as filling materials, dual-cure composite resins placed in bulk can provide marginal adaptation similar to light-cured composites applied with a complex stratification technique.
authors.affiliation: Division of Cariology and Endodontology, School of Dentistry, University of Geneva, Switzerland. Tissiana.Bortolotto@unige.ch
authors.forename: Tissiana
authors.initials: T
authors.lastname: Bortolotto
authors.forename: Karla
authors.initials: K
authors.lastname: Melian
authors.forename: Ivo
authors.initials: I
authors.lastname: Krejci
mesh_terms: D003188:Composite Resins; D003731:Dental Caries / Q000628:therapy*; D003738:Dental Cements; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D006801:Humans; D066298:In Vitro Techniques; D008855:Microscopy, Electron, Scanning; D008963:Molar; D019279:Resin Cements; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D003738:Dental Cements; C469607:OptiBond FL; D019279:Resin Cements; C507210:premise composite resin