title: The effect of current-generation bonding systems on microleakage of resin composite restorations.
abstract: OBJECTIVE
  The aim of this study was to determine the microleakage of current-generation dentin bonding systems in Class II resin composite restorations.
  
  
  METHODS
  Class II (occlusodistal or occlusomesial) cavity preparations with a gingival margin 2 mm apical to the cementoenamel junction were prepared on 70 noncarious, extracted human premolar teeth. Teeth were randomly divided into five groups and treated with different-generation bonding systems (Optibond FL, Gluma One Bond, Clearfil SE Bond, acid etching plus Clearfil SE Bond, and Prompt-L-Pop). All cavities were restored in a posterior resin composite and subjected to 200 thermocycles (at 5 degrees C to 55 degrees C; 30-second dwell time). After immersion in 0.5% basic fuchsin dye for 24 hours, the teeth were sectioned longitudinally and evaluated for dye penetration using a binocular stereomicroscope.
  
  
  RESULTS
  There was no statistically significant differences among bonding systems in the degree of microleakage in the occlusal walls. For gingival walls, statistically significant differences were found only between the Clearfil SE Bond and Prompt-L-Pop groups and the Clearfil SE Bond with acid etching and Prompt-L-Pop groups. The greatest microleakage was observed in Prompt-L-Pop specimens.
  
  
  CONCLUSIONS
  Most of the tested dentin bonding systems were able to eliminate microleakage completely in the occlusal walls, but some systems exhibited statistically significant differences in leakage in the gingival walls.
authors.affiliation: Department of Conservative Dentistry, Faculty of Dentistry, Hacettepe University, Ankara, Turkey. yazioglu@hacettepe.edu.tr
authors.forename: A Rüya
authors.initials: AR
authors.lastname: Yazici
authors.forename: Meserret
authors.initials: M
authors.lastname: Başeren
authors.forename: Berrin
authors.initials: B
authors.lastname: Dayangaç
mesh_terms: D000134:Acid Etching, Dental; D000269:Adhesives / Q000737:chemistry; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification; D003743:Dental Enamel / Q000648:ultrastructure; D003763:Dental Leakage / Q000145:classification*; D003793:Dental Restoration, Permanent / Q000145:classification; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry; D012394:Rosaniline Dyes; D018709:Statistics, Nonparametric; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors; D019237:Tooth Cervix / Q000648:ultrastructure
chemical_list: D000269:Adhesives; C438313:Clearfil SE Bond; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C408265:Gluma One Bond; C469607:OptiBond FL; C408584:Prompt L-Pop; D019279:Resin Cements; D012394:Rosaniline Dyes; C025485:basic fuchsin