Table 1: Standard deviation and range for canal center displacement of the four groups at coronal, middle and apical levels

Instruments (groups)		Level		Scores
				Mean ± SD		Range
1.     Stainless		Coronal		0.12 ± 0.02		0.09-0.16
steel (I)		Middle		0.14 ± 0.02		0.09-0.17
		Apical		0.16 ± 0.02		0.13-0.20
2.     Hands		Coronal		0.11 ± 0.02		0.06-0.15
NiTi (II)		Middle		0.10 ± 0.01		0.08-0.12
		Apical		0.10 ± 0.02		0.07-0.14
3.     ProFile		Coronal		0.10 ± 0.02		0.06-0.17
(III)		Middle		0.05 ± 0.01		0.03-0.07
		Apical		0.04 ± 0.01		0.03-0.11
4.    Lightspeed		Coronal		0.10 ± 0.01		0.08-0.13
LSX (IV)		Middle		0.05 ± 0.01		0.03-0.11
		Apical		0.03 ± 0.01		0.02-0.06