title: Comparative evaluation of microleakage of silorane-based composite and nanohybrid composite with or without polyethylene fiber inserts in class II restorations: an in vitro study.
abstract: OBJECTIVE
  To evaluate microleakage between nanocomposite and silorane composite in class II restorations with or without a polyethylene fiber insert.
  
  
  METHODS
  Standardized class II cavities were prepared on extracted molars and randomly divided into 4 groups (n=20 each): group 1, Ceram X mono; group 2, Ceram X mono + Ribbond; group 3, Filtek P90; and Group 4, Filtek P90 + Ribbond. All specimens were subjected to a thermocycling regime, immersed in 2% methylene blue dye for 24 hours, 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 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 with nanoceramic and silorane composite. A highly significant decrease in microleakage scores was found in silorane composite when compared to nanoceramic composite.
  
  
  CONCLUSIONS
  Use of polyethylene fiber and silorane composite reduces microleakage in class II composite restorations with gingival margins below the cemento-enamel junction.
authors.affiliation: Manubhai Patel Dental College and Oral Research Institute, Department of Conservative Dentistry and Endodontics, Bharuch, Gujarat, India. vineetdent@yahoo.co.in
authors.forename: V S
authors.initials: VS
authors.lastname: Agrawal
authors.forename: V V
authors.initials: VV
authors.lastname: Parekh
authors.forename: N C
authors.initials: NC
authors.lastname: Shah
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry*; D003737:Dental Cavity Preparation / Q000145:classification; D003763:Dental Leakage / Q000145:classification*; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000145:classification*; D006801:Humans; D008422:Materials Testing; D008751:Methylene Blue; D053761:Nanocomposites / Q000737:chemistry*; D020959:Polyethylene / Q000737:chemistry*; D011095:Polyethylenes / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D062047:Silorane Resins / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D019237:Tooth Cervix / Q000473:pathology
chemical_list: C520091:CeramX; D004396:Coloring Agents; D003188:Composite Resins; D003764:Dental Materials; D011095:Polyethylenes; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; C084063:RIBBOND; D062047:Silorane Resins; C544925:filtek P90; D020959:Polyethylene; D008751:Methylene Blue