الفهرس 
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Abstract
The purpose of the present study was to evaluate and compar h
ficiency of two N iTi rotary systems; Pro Taper system and Re 0- syst m
to that of conventional Gates-Glidden drills combined with H-file In
removing root canal filling when two different sealers; iRoot P and
Endofill were employed.
E”\1a\uaticm ’Na~ can:ieQ-out u~\ng-.
1. Optical stereomicroscope (OSMj.
2. Scanning electron microscope (SEM).
•