الفهرس 
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Abstract
Different levels of residual moisture in the root canal have been shown to
alter the sealing properties of conventional and resin-based sealers. The quality
of adhesion between root canal dentin and sealers may be also affected by the
moisture condition of the root canals before filling procedures. Despite the fact
that the perception of moisture may vary widely among clinicians, several
manufacturers recommend that the root canals be maintained in a moist state to
benefit from the hydrophilic properties of their sealers without providing exact
clinical instructions for achieving the degree of residual moisture that is ideal for
their products (74).
The purpose of this study was to find whether the residual moisture had an
effect on sealing ability using different mixture sealer types.
In the present study seventy single canalled posterior human permanent teeth
with mature apices were collected, where ten teeth were used as positive and
negative control groups, the other sixty prepared teeth were divided into two
main groups (n=30 teeth) according to level of moisture into dry and wet groups.
Each group was later subdivided according to obturation system used into
three sub-groups (n=10):
Subgroup (1): was obturated by RealSeal SE system
Subgroup (2): was obturated by EndoRez system.
Subgroup (3): was obturated by AH Plus/Gutta percha.
Apical seal was evaluated by dye extraction method using spectrophotometer
Summary and conclusion
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and the result showed the following:
All the sealers used in the study showed significant difference between dry
and wet moisture condition.
In the dry canal condition it was found that the sealing ability of RealSeal
SE/ Resilon was better than AH-Plus /Gutta percha, while no significant
difference was observed between the other groups.
In moist canal condition there was no significant difference between all the
sealers.
This study concluded the following:
1-Moisture condition of root canals at the time of obturation had a
significant undesirable effect on leakage and sealing ability of both epoxy resin
sealer (AH-plus) and methacrylate resin based sealers (RealSeal SE and
EndoRez sealers).
2-The drying procedure is a critical step and should not be missed in
endodontic treatment. All sealers exhibited their highest dye absorbance values
under the wet canal condition.
The present study recommended that:
1-Drying of the root canals prior obturation even with hydrophilic resin
sealers as wet canal condition would represent extreme experimental scenarios
that should be avoided in the clinical situation.
2-The results suggest that the RealSeal SE/Resilon root canal obturation
system might provide better seal due to the ability of forming monoblock
obturation.