الفهرس 
Dye penetration methodOnly 14 pages are availabe for public view
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Abstract
Our study was conducted to evaluate the sealing ability and
retrievability of GuttaCore obturating material and
comparing it with warm vertical compaction technique.
Sealing ability was evaluated using dye penetration method
(clearing method). Retrievability, with different solvents, was
evaluated by measuring the percentage of remaining obturation
material and the time required for retreatment process.
The total number of samples (n=80) were classified into two main
groups (I and II) (n=40) according to the obturation technique
used. Each main group was subdivided into two subgroups
according to evaluation method: Subgroup 1 (n=10) where sealing
ability was evaluated and subgroup 2 (n=30) where retrievability
of the filling material was evaluated. Subgroup 2 was further
subdivided into three subdivisions (N, C & E) according to the
solvent used during retreatment (no solvent, chloroform &
eucalyptol).
Samples were decoronated, prepared using Protaper universal
files until F4 followed by apical refinement by K-file #45. Group
I was obturated using GuttaCore obturators and group II was
obturated using warm vertical compaction technique.
Subgroup 1 was evaluated for sealing ability using dye
penetration method. Samples were immersed in India ink for 7 days and then subjected to clearing process to measure the linear
apical dye penetration.
Obturation material of samples of subgroup 2 was removed using
Protaper universal retreatment system followed by further canal
instrumentation using F3 and F4 and final apical refinement using
H-file #45. The removal was done either with no solvent, with
chloroform, or with eucalyptol. Percentage of remaining
obturation material was measured by vertical sectioning of the
roots followed by image capturing by stereomicroscope and
image analysis using imageJ software. The time required for
retreatment was measured from the first retreatment file used until
no obturation material can be distinguished on the last file.
GuttaCore showed lesser mean of linear apical dye penetration
than warm vertical compaction technique but with no statistically
significant difference.
GuttaCore left more remaining material apically (than coronal and
middle thirds) in non solvent, chloroform, and eucalyptol groups.
Non solvent group showed significantly the most percentage of
remaining GuttaCore material in both middle and apical portions
of the canal.
Warm vertical compaction group left more remaining material
apically (than coronal and middle thirds) in non solvent, chloroform, and eucalyptol groups. Non solvent group showed
significantly the most percentage of remaining gutta-percha in
both middle and apical portions of the canal. Eucalyptol group
showed significantly the most remaining obturation material
coronally.
With no solvent, GuttaCore left significantly more remaining
material than warm vertical compaction technique at the coronal
portion of the canal. No statistically significant difference was
found between the two groups at middle and apical portions.
With chloroform, GuttaCore left significantly more remaining
material than warm vertical compaction technique at coronal and
apical portions. No statistically significant difference was found
between the two groups at the middle portion.
With eucalyptol, GuttaCore left significantly more remaining
material than warm vertical compaction technique at the coronal
portion. No statistically significant difference was found between
the two groups at middle and apical portions.
With no solvent, GuttaCore recorded significantly more time for
retreatment than warm vertical compaction technique. With
chloroform, the difference was not significant while with
eucalyptol GuttaCore recorded significantly lesser time than
warm vertical compaction technique.