Table 1 Minimum, maximum, mean ± standard error, standard deviation and median values of residual root canal filling material volume of experimental groups

ProTaper Universal

11

1.5010

2.1145

1.8172 ± 0.0657a

0.2178

1.8527

 < 0,05

Reciproc R25

12

2.0797

3.2872

2.6659 ± 0.0969c

0.3356

2.6257

R-Endo

12

2.133

3.371

2.665 ± 0.119c

0.412

2.636

XP-Endo Retreat

12

1.4365

1.9230

1.7570 ± 0.0495a

0.1715

1.8082

Hand File

11

1.9316

2.8955

2.251 ± 0.0805b

0.2670

2.2204