Table 2 Minimum, maximum, mean ± standard error, standard deviation and median values of residual root canal filling material percent (%) of experimental groups

ProTaper Universal

11

11.517

12.940

12.286 ± 0.155

0.515

12.601a

 < 0,05

Reciproc R25

12

12.680

16.780

14.978 ± 0.337

1.167

15.213b

R-Endo

12

12.967

16.587

15.041 ± 0.387

1.340

15.560b

XP-Endo Retreat

12

10.586

11.985

11.550 ± 0.114

0.395

11.625a

Hand File

11

9.553

13.580

11.772 ± 0.359

1.192

11.553a