title: Effect of accelerated restorative techniques on the microleakage of Class II composites.
abstract: OBJECTIVE
  To assess the marginal seal of Class II resin-based composite restorations cured by a high intensity halogen light or a plasma arc light.
  
  
  METHODS
  Class II cavities were prepared in extracted molar teeth with cervical margins located apical to the cemento-enamel junction. Cavities were restored with a posterior resin-based composite (Tetric Ceram) using either a two-increment or a bulk placement and cure restorative technique after application of bonding agent (Excite). Test parameters included light unit type/curing mode, application of flowable composite and restorative technique. After thermocycling, the teeth were immersed in basic fuchsin dye. Sectioned restorations were examined under a stereomicroscope (x 25) and extent of microleakage (mm) was recorded using an image analysis system. Data was analyzed by non-parametric statistical tests.
  
  
  RESULTS
  No leakage was observed at the occlusal enamel margin of a nyrestoration. Median gingival leakage values for the different test groups ranged from 0.02-2.51 mm. Light unit type had a highly significant effect on leakage (P=0.0002). The highest leakage scores were recorded with the plasma arc light used in standard curing mode and the lowest with the halogen light in turbo-boost mode.
authors.affiliation: University of Ankara, Faculty of Dentistry, Beseveler, Turkey.
authors.forename: Sadullah
authors.initials: S
authors.lastname: Uctasli
authors.forename: Adrian C
authors.initials: AC
authors.lastname: Shortall
authors.forename: Frederick J T
authors.initials: FJ
authors.lastname: Burke
mesh_terms: D000134:Acid Etching, Dental; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification; D003743:Dental Enamel / Q000473:pathology; D003763:Dental Leakage / Q000145:classification*; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000145:classification / Q000379:methods*; D003804:Dentin / Q000473:pathology; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006219:Halogens; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008027:Light; D008689:Methacrylates / Q000737:chemistry; D008963:Molar / Q000473:pathology; D012394:Rosaniline Dyes; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013816:Thermodynamics; D013997:Time Factors; D019237:Tooth Cervix / Q000473:pathology; D014783:Viscosity
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; C420130:Excite cement; D006219:Halogens; D008689:Methacrylates; D012394:Rosaniline Dyes; C121818:Tetric ceram; C025485:basic fuchsin