الفهرس 
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Abstract
The aim of the present investigation was to:
1-Evaluate and compare the ability of smear layer removal and opening of dentinal tubules using 5.25% sodium hypochlorite followed by 17% EDTA .
2-Evaluate and compare the ability of smear layer removal and opening of dentinal tubules using 5.25% sodium hypochlorite followed by 10% citric acid