title: Micro-CT evaluation of the quality of root fillings when using three root filling systems.
abstract: OBJECTIVE
  To evaluate the percentage volumes of filling materials and voids in single-rooted teeth filled with three different filling systems using micro-computed tomography (micro-CT).
  
  
  METHODS
  Thirty single-rooted human teeth were used. After preparation of the root canals, the teeth were randomly divided into three groups (n = 10). The canals were filled with EndoREZ, ActiV GP or AH Plus/gutta-percha. Each specimen was scanned using a micro-CT device at a resolution of 13.68 μm. Percentage volumes of root filling materials and voids were calculated and data were analysed statistically using the Kruskal-Wallis test and the Mann-Whitney U-test with Bonferroni adjustment. Within each group, the Friedman test was performed with the Wilcoxon signed-rank test to detect discrepancies.
  
  
  RESULTS
  The percentage volume of filling material was significantly lower in the ActiV GP group than in the other groups (P < 0.05), whilst the percentage volume of voids was significantly higher in the ActiV GP group than in the other groups (P < 0.05).
  
  
  CONCLUSIONS
  None of the systems were associated with void-free root fillings. The ActiV GP system had a significantly higher percentage volume of voids than the other systems.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey.
authors.forename: E D
authors.initials: ED
authors.lastname: Başer Can
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey.
authors.forename: A
authors.initials: A
authors.lastname: Keleş
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey.
authors.forename: B
authors.initials: B
authors.lastname: Aslan
mesh_terms: D000180:Acrylic Resins; D003188:Composite Resins; D004853:Epoxy Resins; D006801:Humans; D066298:In Vitro Techniques; D012387:Root Canal Filling Materials / Q000592:standards*; D055114:X-Ray Microtomography
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; C481259:EndoRez; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; C528807:activ GP sealer; C534916:epoxy resin-based root canal sealer
keywords: AH Plus; ActiV GP; EndoREZ; filling quality; micro-computed tomography