الفهرس 
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Abstract
The aim of this study was to compare the apical microleakage of three gutta percha filling materials: Thermafil, soft core regular, and soft core low heat obturators using fluid filtration technique, also to compare the effect of two irrigants: Sodium Hypochlorite and Chlorhexidine Gluconate on the apical microleakage at two different time periods, and finally to compare the percentage of gutta percha filled area in cross sections of root canals in the three obturating techniques, at hree different levels of root.