Influence of cervical preflaring using different rotary instruments on the accuracy of apical file size determination: A comparative in-vitro study.

Aim: To investigate the influence of cervical preflaring using different rotary instruments on apical file size determination.

Materials And Methods: Extracted human molar teeth were randomly divided in to eight groups (N = 10): Control group (CG); LA Axxess group (LA); HyFLex group (HF); GatesGlidden group (GG); ProTaper group (PT); Race group(RC); FlexMaster group (FM); and K3 group (K3). Patency was maintained and working length was established under magnification.