Effect of Patency File on Transportation and Curve Straightening in Canal Preparation with ProTaper System

Table 2

Means ± standard deviations of transportation and curve straightening of each group.

	Number	Transportation; (millimeter)	Curve straightening; (degree)
Group A	35	0.14±0.03	1.41±0.30
Group B	35	0.11±0.03	1.10±0.30
Control group	20	0.00±0.00	0.00±0.00

Group A: preparation without using a patency file and group B: preparation with the use of a patency file.