Characterization Interface of root dentine to root canal sealers interface of selected root canal sealers
Available online 25 November 2013
Abstract
Objective
Root
canal sealers can interact physically or chemically with dentine. The
aim of this study was to characterize the dentine-root canal sealer
interface of experimental sealers based on Portland cement using an
epoxy-based vehicle in comparison to an epoxy resin sealer, AH Plus.
Methods
Root
canals were biomechanically prepared and filled with either one of four
experimental epoxy sealers containing Portland cement with micro and
nano particles of either zirconium oxide or niobium oxide radiopacofers,
or AH Plus. The dentine-sealer's interfaces were assessed by coronal
penetration of fluorescent microspheres, the penetration of sealers
labeled with Rhodamine B inside the dentine tubules (following
obturation with gutta-percha and sealers using System B technique)
assessed by confocal laser scanning microscopy, and the chemical
characterization of dentine-sealers interface by scanning electron
microscopy (SEM) and energy dispersive spectroscopy (EDS) line scans.
Results
No
penetration of fluorescent microspheres at the root-dentine to sealer
interface was recorded for all test materials. Sealers presented greater
ability to penetrate within the dentinal tubules at the coronal and
mid-root thirds. The experimental sealers containing radiopacifier nano
particles exhibited a more homogeneous microstructure along the whole
length of the canal. EDS-line scans results showed a migration of
silicon and niobium into dentine. Peak overlap between zirconium and the
phosphorous compromised the identification of the migration of the
zirconium oxide into dentine.
Conclusions
All
five sealers promoted coronal sealing. The experimental sealers
exhibited promising characteristics and were comparable to AH Plus
sealer. Elemental migration of the experimental sealers suggests
material interaction with dentine which was not displayed by AH Plus.
Comments