control group had no cracks, and the difference between the control
group and the experimental groups was statistically significant (P
< .001). The ProTaper Next and TF Adaptive systems produced
significantly less cracks than the ProTaper Universal and WaveOne
systems in the apical section (3 mm) (P < .05).
the study conditions and within the limitations of this study, it can
be concluded that the ProTaper Universal, ProTaper Next, WaveOne, and TF
Adaptive instruments can result in dentinal cracks.5>