Table 1 Mean transportation ± standard deviation (in millimeters) of central axis after instrumentation at 10 points from apical constriction in L-shaped root canals

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