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 2

Comparison of incidence of cracks at instrumentation length between PTU and PTN groups.

File type	Number of cracks	Instrumentation length			value	value
		AF + 1 mm	AF	AF − 1 mm
PTN	16	8 (50.0)	5 (31.3)	3 (18.8)	0.50	0.777
PTU	17	8 (47.1)	7 (41.2)	2 (11.8)