Abstract: Background: Evaluating dentinal cracks in root canal surface after biomechanical preparation using rotary files systems as ProTaper Next,2 Shape and Race. Methodology:Forty extracted human single canal mandibular premolars were weredecoronated perpendicular to the long axis of the tooth leaving roots (12±1mm) then positioned centrally in a mold using acrylic resin. Roots were randomly divided into 4 main groups(n=10) according to the Nickel Titanium (Ni-Ti) rotary file system used in preparation:Group I: Control group roots were left unprepared. Group II: Canals were prepared using Ni-Ti 2 shape system up.....
Keywords:2 Shape,Dentinal cracks, Nickel Titanium,ProTaperNext,Race.
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