The effect of coronal flaring on canal transport in two different single file systems operated by rotation and reciprocal movement

The aim of this study was to investigate the effect of coronal flaring on canal transport in S-shaped simulated resin blocks in two different single file systems with rotation and reciprocal motion. In the study, 48 S-shaped simulated resin blocks were stained and photographed using black ink. The blocks were then randomly divided into four groups: Group A (OC) (n = 12), Group B (OR) (n = 12), Group C (OF + OC) (n = 12) and Group D (OF + OR) (n = 12). Simulated canals were prepared according to the NiTi file system and photographed again after staining with red ink. The pre- and post-preparation images were superimposed and the amount of resin removed from both the mesial and distal side of the canal was measured from the apical foramen to 10 mm in a 1 mm increment. The preparation time was also calculated. The data obtained were statistically analyzed. No significant difference was observed between all groups in terms of transportation (p>0.05). The groups with coronal flaring showed statistically significantly higher transport values than the groups without coronal flaring (p<0.05). There was no significant difference in transport between single file systems with different kinematics (p>0.05). Significantly higher shaping times were observed in the groups using both coronal flaring files (p<0.05). Similar transport was observed between two different single file systems with different kinematics. No significant effect of coronal flaring on transport was observed.