الفهرس 
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Abstract
The present study was performed to evaluate and compare the cleaning efficacy of EndoVac irrigation system and conventional Needle with the use of different irrigating solutions (sodium hypochlorite, 17% EDTA, MTAD and Saline). A total of 80 human freshly extracted single rooted teeth with straight, mature fully developed, single root canals and anatomically similar dimensions were utilized in this study. After access opening and working length determination, samples were divided randomly into two equal main groups according to the method of irrigation system used: Group A for EndoVac System, and Group B for Needle irrigation. Each group was further subdivided into four equal subgroups according to the type of irrigant solution used: Subgroup 1: NaOCl 5.25% only, Subgroup 2: NaOCl 5.25% and EDTA 17%, Subgroup 3: NaOCl 5.25% and MTAD, Subgroup 4: Normal saline only as control.