A Stereomicroscopic Evaluation of Dentinal Cracks at Different Instrumentation Lengths by Using Different Rotary Files (ProTaper Universal, ProTaper Next, and HyFlex CM): An Ex Vivo Study

Table 1

Incidence of apical root cracks after canal preparation with rotary files at different instrumentation length.

File type	Number of cracks ()	Instrumentation length
		AF + 1 mm ()	AF + 0 mm ()	AF − 1 mm ()	AF − 2 mm ()
PTN ()	16	8 (50.0)	5 (31.3)	3 (18.8)	0 (0.0)
PTU ()	17	8 (47.1)	7 (41.2)	2 (11.8)	0 (0.0)
HyFlex CM ()	1	0 (0.0)	1 (2.9)	0 (0.0)	0 (0.0)
Control ()	0	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)
Total ()	34	16	13	5	0