The Effect of Cervical Preflaring Using Different Rotary Nickel-Titanium Systems on the Accuracy of Apical File Size Determination

Preflaring of root canals prevents underestimation of the actual apical root canal diameter. The type of instruments used for preflaring show differences on the accuracy of IAF determination. Preflaring with larger tapered instruments leads to a more accurate apical sizing, and this information is crucial concerning the appropriate final diameter for complete apical shaping.