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

Table 3.

Mean values ± standard deviation of straightened degree from original angles after instrumentation in L-shaped and S-shaped root canals

	In L-shaped canals	In S-shaped canals
Group	Straightened angles (°)	Coronal curvature (°)	Apical curvature (°)
PTU	6.00 ± 1.09^c	6.32 ± 0.80^b	22.51 ± 3.45^a
WO	4.73 ± 0.54^b	7.31 ± 0.73^c	20.44 ± 2.02^a
PTN	0.90 ± 1.58^a	5.19 ± 1.42^a	21.03 ± 2.21^a
P value	<0.05	<0.05	>0.05

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