title: Effect of fiber reinforcement on microleakage of class II cavities restored with a novel G-aenial posterior composite, silorane composite, and nanohybrid composite: an in vitro comparative study.
abstract: OBJECTIVE
  The aim of the present study was to compare G-aenial, silorane, and nanoceramic composites and the effect of polyethylene fiber inserts in reducing gingival microleakage in class II composite restorations placed apical to the cementoenamel junction.
  
  
  METHODS
  Standardized class II cavities were prepared on extracted molars and randomly divided into six groups (n = 20 each): group 1, Ceram X mono; group 2, Ceram X mono + Ribbond; group 3, Filtek P90; group 4, Filtek P90 + Ribbond; group 5, G-aenial posterior; and group 6, G-aenial posterior + Ribbond. All specimens were subjected to a thermocycling regime, immersed in 2% methylene blue dye for 24 h, sectioned longitudinally, and examined under a stereomicroscope to assess dye penetration on a six-point scale. The score data were subjected to statistical analysis, whereby the Kruskal-Wallis analysis of variance was used for multiple group comparisons and the Mann-Whitney test for groupwise comparisons at a significance level of P ≤ 0.05.
  
  
  RESULTS
  A statistically-significant decrease in microleakage was found when Ribbond fiber was used: group 2 vs group 1 (P < 0.001), group 4 vs group 3 (P < 0.001), and group 6 vs group 5 (P < 0.001). A significant decrease in microleakage scores was found in the silorane and G-aenial posterior composites when compared to the nanoceramic composite (P < 0.001).
  
  
  CONCLUSIONS
  The use of polyethylene fiber, silorane composite, and G-aenial posterior composite reduces microleakage in class II composite restorations with gingival margins below the cementoenamel junction.
authors.affiliation: Department of Conservative and Endodontics, M.P. Dental College and Hospital, Vadodara, India.
authors.forename: Vineet
authors.initials: V
authors.lastname: Agrawal
authors.affiliation: Department of Conservative and Endodontics, M.P. Dental College and Hospital, Vadodara, India.
authors.forename: Sonali
authors.initials: S
authors.lastname: Kapoor
mesh_terms: D003188:Composite Resins; D003731:Dental Caries / Q000628:therapy*; D003737:Dental Cavity Preparation; D003763:Dental Leakage / Q000517:prevention & control*; D003793:Dental Restoration, Permanent; D006801:Humans; D066298:In Vitro Techniques; D008963:Molar; D011095:Polyethylenes; D011897:Random Allocation; D062047:Silorane Resins; D019237:Tooth Cervix
chemical_list: C520091:CeramX; D003188:Composite Resins; D011095:Polyethylenes; C084063:RIBBOND; D062047:Silorane Resins; C544925:filtek P90
keywords: G-aenial posterior composite; microleakage; nanohybrid composite; polyethylene fiber; silorane composite