Cone-beam computed tomographic analysis of apical transportation and centering ratio of ProTaper and XP-endo Shaper NiTi rotary systems in curved canals: an in vitro study

Table 2 Mean (± standard deviation) centering ratio in the mesiodistal and buccolingual directions in the two groups

Direction	Distancefrom working length	3 mm	4 mm	5 mm
Direction	Centering ratio	Mean(SD)	4 mm	5 mm
Mesiodistal	ProTaper	0.47(0.30)	0.37(0.28)	0.45(0.28)
	XP-endo Shaper	0.53(0.33)	0.63(0.26)	0.61(0.26)
	P value	0.521	0.003	0.061
Buccolingual	ProTaper	0.31(0.36)	0.26(0.32)	0.18(0.25)
	XP-endo Shaper	0.31(0.38)	0.31(0.37)	0.26(0.30)
	P value	0.977	0.609	0.384

ISSN: 1472-6831