title: Gap formation between different cavity walls and resin composite systems on primary and permanent teeth.
abstract: OBJECTIVE
  The aim of this study was to compare the effectiveness of five self-etching and etch-rinse dentin-bonding agents in achieving a gap-free adaptation between the restorative material and the dentin in primary and permanent teeth.
  
  
  METHODS
  Gaps located at the restoration dentin interface were evaluated using scanning electron microscopy (SEM).
  
  
  RESULTS
  There were more gaps on the corner of the cavities, but no significant difference was detected between different cavity walls (p>0,05). Statistical results of the SEM analysis revealed fewer gaps in the restorations made with self-etching dentin bonding agents than etch-rinse agents at the restoration-dentin interface in both primary and permanent teeth.
  
  
  CONCLUSIONS
  Self-etching bonding systems were preferable in primary and permanent teeth according to the results of this study. However, further studies should be conducted to determine a favorable strategy to eliminate the gaps on the corners of cavities and maintain a gap-free adaptation between resin composite and tooth structure.
authors.affiliation: Department of Pediatric Dentistry, Faculty of Dentistry, University of Gazi, Ankara, Turkey. ozlemt@gazi.edu.tr
authors.forename: Ozlem
authors.initials: O
authors.lastname: Tulunoglu
authors.forename: Asli Evren
authors.initials: AE
authors.lastname: Ulker
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D003188:Composite Resins; D003737:Dental Cavity Preparation; D018772:Dental Marginal Adaptation; D003804:Dentin; D017220:Dentin-Bonding Agents; D019229:Dentition, Permanent; D006801:Humans; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements; D018709:Statistics, Nonparametric; D014094:Tooth, Deciduous
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements