3D micro-CT analysis of the interface voids associated with Thermafil root fillings used with AH Plus or a flowable MTA sealer

M. G. Gandolfi, A. P. Parrilli, M. Fini, C. Prati, P. M H Dummer

Research output: Contribution to journalArticle

Abstract

Aim: To investigate nondestructively the percentage of 3D voids and marginal gaps in a pre-defined interface volume of interest (VOI) within root fillings produced by Thermafil Obturators with either a hydrophobic epoxy-resin-based sealer (AH Plus) or a hydrophilic flowable calcium-silicate sealer [mineral trioxide aggregate (MTA) Flow]. Methodology: Sixteen single root canals from extracted premolar teeth were prepared with ProTaper rotary instruments, randomly allocated into two groups (n=8) and filled with size 30 Thermafil Obturators in association with AH Plus or MTA Flow sealers. The filled roots were stored at 37°C in 5mL of Hank's balanced salt solution (HBSS) used to represent body fluids and scanned after 7days and 6months using a high-resolution micro-CT. From each root, images of 3000 sections were analysed in 3D and binarized using a high-resolution micro-CT (4-μ resolution). The 3D distribution of voids (porosity and marginal gaps) at the gutta-percha-sealer-dentine interface was detected through a threshold grey level and expressed as percentage of the 40-μ-thick pre-defined interface VOI (20μ of interface dentine and 20μ of gutta-percha/sealer). A method of analysis based on the root canal segmentation was used, and coronal, middle and apical thirds considered separately. The percentage of 3D void volume was compared statistically using one-way anova (significance for P3 with 1.35μmdiameter were detected. Cul-de-sac-type voids (blind pores) and through-and-through voids (continuous pores) were discriminated. The apical thirds had a significantly lower 3D void volume (P

Original languageEnglish
Pages (from-to)253-263
Number of pages11
JournalInternational Endodontic Journal
Volume46
Issue number3
DOIs
Publication statusPublished - Mar 2013

Keywords

  • 3D micro-CT
  • AH Plus
  • Flowable MTA sealer
  • Interface porosity
  • Mineral trioxide aggregate
  • Thermafil

ASJC Scopus subject areas

  • Dentistry(all)

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