Dentinal Microcrack Formation after Root Canal Instrumentation by XP-Endo Shaper and ProTaper Universal: A Microcomputed Tomography Evaluation

Table 1

The number of complete and incomplete microcracks before and after instrumentation with XPES and PTU.

Type of microcrack	Groups		Number of microcracks
			Apical	Middle	Cervical
Complete	XPES	Before	0	1	8
		After	0	3	19
		value	1.000	0.157	0.0001∗
	PTU	Before	1	2	11
		After	1	5	20
		value	1.000	0.083	0.011∗
	XPES vs. PTU	value	1.000	0.636	0.685
Incomplete	XPES	Before	3	23	41
		After	3	41	45
		value	1.000	0.0001∗	0.465
	PTU	Before	8	27	35
		After	10	37	37
		value	0.317	0.317	0.627
	XPES vs. PTU	value	0.317	0.025∗	0.662

∗ Statistically significant difference.