A Digital Microscopic Inspection of Dentinal Defects after Using Endodontic Retreatment Files

Table 2

Overall distribution of defects.

		Types
				Type A		Type B		Type C		Type D
				Count	Column N (%)	Count	Column N (%)	Count	Column N (%)	Count	Column N (%)
Group	Negative control			45	28.0	0	0.0	0	0.0	0	0.0
	Positive control			43	26.7	1	16.7	1	8.3	0	0.0
	PTUR			32	19.9	5	83.3	8	66.7	0	0.0
	XP			41	25.5	0	0.0	3	25.0	1	100.0

Only presence of defect is listed in the table; however, both presence and absence are used for the calculation of Kruskal–Wallis H.