الفهرس 
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Abstract
Complete removal of the defective root canal filling material and regaining apical
patency is the main factor of endodontic retreatment success.
Aim of the study: Assessment of the ability of Reciproc R25 (VDW, Munich, Germany),
Reciproc blue (VDW, Munich, Germany) and the XP-endo shaper (FKG Dentaire, La Chauxde-
Fonds, Switzerland) in removing of the root filling material from oval shaped canals using
cone beam computed tomography (CBCT).
Materials and Methods: Thirty six extracted single rooted human mandibular premolar teeth
were prepared chemo-mechanically using Revo-S rotary file system (Micro-Mega, France) and
obturated. The teeth were randomly divided into three groups (N=12 each) according to files used
in retreatment procedure as follow: group I: Reciproc R25, group II: Reciproc blue, group III:
XP-endo shaper. Cone beam computed tomography (CBCT) was used to scan the specimens
before and after retreatment to measure the volume of filling material by using (Osirix lite)
software. Also, time consumed by each file was recoded. Volume of remaining obturating
material was compared between groups using Kruskal Wallis Test. Intragroup comparisons before
and after gutta perch removal were done using Wilcoxon Sign Rank test. Comparisons between
apical, middle, and coronal thirds percent reduction within each group were done using Freidman
test, while differences in time required for gutta percha removal were compared using One Way
ANOVA test and followed by Tukey’s post hoc test.
Results: All systems significantly removed gutta percha. However, none of the used files
completely removed the root canal filling material from the canals. No statistically significant
differences (P> 0.05) in residual filling material were observed among the groups, the percentage
of reduction was 88.87 % in (group 1), 92.22 % in (group 2), and 88.60 % in (group 3).
Coronally, Reciproc blue left less remnants with no significant difference between the groups
(P>0.05). In the middle third XP-endo shaper left less remnants with no significant difference
between the groups(P>0.05). In the apical third Reciproc R25 left less remnants with no
significant difference between groups (P>0.05). Time consumed by each file showed statistically
significant difference between XP-endo shaper and the two other groups. More time required by
the XP-endo shaper by average mean (10.52 min) followed by Reciproc blue (6.67 min) then
Reciproc R25 (5.38 min).