الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
The purpose of this study was to compare beween Pro -Taper , Race , K3 and NRT rotary nickel titanium systems
as regard to the amount of debris extruded apically and the cleanliness of root canal dentin wall after
instrumentation with the four selected system . Forty human maxillary central incisors with completely formed
apices and straight canals were selected . Standard access cavities ere prepared .