. 2015 Mar 1;15:27. doi: 10.1186/s12903-015-0012-z

Table 1.

Mean transportation ± standard deviation (in millimeters) of central axis after instrumentation at 10 points from apical constriction in L-shaped root canals

Group	0 mm	1 mm	2 mm	3 mm	4 mm	5 mm	6 mm	7 mm	8 mm	9 mm
PTU	0.06 ± 0.03^b	0.06 ± 0.03^a	0.06 ± 0.04^a,b	0.05 ± 0.04^a	0.10 ± 0.06^a	0.16 ± 0.05^a	0.11 ± 0.04^a	0.06 ± 0.04^a	0.04 ± 0.04^a	0.05 ± 0.04^a
WO	0.10 ± 0.03^b	0.11 ± 0.03^b	0.07 ± 0.04^b	0.06 ± 0.04^a	0.16 ± 0.04^b	0.22 ± 0.04^b	0.16 ± 0.03^b	0.07 ± 0.02^a	0.03 ± 0.01^a	0.02 ± 0.01^a
PTN	0.05 ± 0.02^a	0.07 ± 0.04^a	0.06 ± 0.02^a	0.06 ± 0.04^a	0.11 ± 0.03^a	0.16 ± 0.02^a	0.10 ± 0.02^a	0.07 ± 0.02^a	0.07 ± 0.03^b	0.08 ± 0.03^b
P value	<0.05	<0.05	<0.05	>0.05	<0.05	<0.05	< 0.05	>0.05	< 0.05	< 0.05

Within the same column, values with same superscript letter were not statistically different.