title: Microleakage evaluation of Silorane-based composite and methacrylate-based composite in class II box preparations using two different layering techniques: an in vitro study.
abstract: OBJECTIVE
  The aim of this study was to compare the microleakage in Class II box preparations with the gingival margin above and below the cemento-enamel junction (CEJ) restored with Silorane composite and methacrylate composite using two different layering techniques.
  
  
  METHODS
  Standardized box preparations (mesial box 1 mm above the CEJ and distal box 1 mm below the CEJ) were prepared in 60 upper premolars. The teeth were randomly divided into four groups containing 15 samples each; Group I: Restored with a Silorane composite using an oblique layering technique, Group II: Restored with Silorane composite using a vertical layering technique, Group III: Restored with methacrylate composite using the oblique layering technique, and Group IV: Restored with methacrylate composite using the vertical layering technique. The samples were stored in distilled water, followed by thermocycling and immersed in 2% methylene blue. The samples were sectioned and evaluated for microleakage at the gingival margin.
  
  
  METHODS
  Kruskal-Wallis, Fischer exact test, Wilicoxon test, and Mann-Whitney U test.
  
  
  RESULTS
  Silorane composite had significantly lesser microleakage. No significant difference in microleakage was observed above and below the CEJ for Silorane-based composite.
  
  
  CONCLUSIONS
  Silorane composite resin showed lesser microleakage compared to methacrylate composite resin.
  
  
  CONCLUSIONS
  The Silorane-based composites improve the marginal adaptation due to their reduced shrinkage, thereby decreasing the residual stress at the adhesive-tooth interface.
authors.affiliation: Department of Conservative Dentistry and Endodontics, The Oxford Dental College, Research Centre and Hospital, Bangalore, India.
authors.forename: Asha
authors.initials: A
authors.lastname: Joseph
authors.forename: Lekha
authors.initials: L
authors.lastname: Santhosh
authors.forename: Jayshree
authors.initials: J
authors.lastname: Hegde
authors.forename: Srinivas
authors.initials: S
authors.lastname: Panchajanya
authors.forename: Reshmi
authors.initials: R
authors.lastname: George
mesh_terms: D004396:Coloring Agents; D003188:Composite Resins / Q000737:chemistry*; D055117:Curing Lights, Dental; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification*; D003763:Dental Leakage / Q000145:classification*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000145:classification; D006801:Humans; D055115:Light-Curing of Dental Adhesives / Q000295:instrumentation; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D008751:Methylene Blue; D058105:Polymerization; D019279:Resin Cements / Q000737:chemistry; D062047:Silorane Resins / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D019237:Tooth Cervix / Q000473:pathology; D014867:Water / Q000737:chemistry
chemical_list: C112828:Clearfil AP-X; C438313:Clearfil SE Bond; D004396:Coloring Agents; D003188:Composite Resins; D008689:Methacrylates; D019279:Resin Cements; D062047:Silorane Resins; C544925:filtek P90; D014867:Water; D008751:Methylene Blue