الفهرس 
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Abstract
Aim of the study:
The aim of the study was to evaluate the effect of using
different irrigation protocols on the push-out bond strength of
SE Real Seal/Resilon system.
Methodology:
A total of seventy five human extracted single rooted
teeth were used in the study.
The teeth were decoronated, cleaned and shaped using
step back technique. Initial rinsing was done using 5ml
2.5%NaOCl. The samples were divided into five groups (15
each) according to the final irrigation protocol. Group (1) was
irrigated with 5ml 2.5% NaOCl for 1 minute, group (2) was
irrigated with 5ml 17%EDTA for 1 minute, group (3) was
irrigated with 5ml 17%EDTA followed by 5ml 2%CHX each
for 1 minute. Group (4) was irrigated with 5ml Bio Pure MTAD
for 1 minute and group (5) was irrigated with 5ml Bio Pure
MTAD followed by 5ml 2%CHX each for 1 minute. All roots
were obturated with SE Real Seal/Resilon system using cold
lateral compaction technique. Then 1mm thick sections were
cut transversely from cervical, middle and apical canal portions
to be subjected to push-out bond strength test in universal
testing machine at a cross head speed of 0.5 mm/min. Failure
mode was analyzed using scanning electron microscope.
Results:
The results of push out testing showed that MTAD + CHX
group(5) recorded the highest push out bond strength mean
Summary and Conclusion
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value followed by NaOCl group(1) and EDTA group(2). Then
MTAD group(4) respectively while EDTA + CHX group(3)
recorded statistically significant the lowest mean value. There
was no statistically significant difference between NaOCl and
EDTA groups, NaOCl and MTAD + CHX groups, EDTA and
MTAD + CHX groups. Cervical canal portion recorded higher
bond strength mean value compared with the middle and apical
canal portions in most of the tested groups. Failure mode
analysis showed the predominance of mixed failure in most of
the tested groups.
Conclusions:
Within the limitations of this study, it could be concluded that:
1. The use of NaOCl or EDTA as final irrigants should be
encouraged when SE RealSeal/Resilon system was selected
for obturation.
2. The use of MTAD alone as final irrigant should be
discouraged when SE RealSeal/Resilon system was
selected.
3. The combined use of MTAD and 2%CHX improved the
bond strength of SE RealSeal/Resilon system when both
were used as final irrigants.
4. 2%CHX shouldn’t be used after EDTA when SE
RealSeal/Resilon system was selected for obturation