Table 3 Mean ± standard deviation (SD) of shear-bond strength values (MPa) of four endodontic sealer materials and a composite resin filling material tested on four different dentin sites, the crown part of the tooth and apical, middle and cervical thirds of the root canal wall, with and without removing the smear layer using EDTA

AH-s

1.4(0.4) N=8xa

2.0(0.8) N=10xa

3.5(0.7) N=10xb

3.4(0.4) N=3xb

P<0.001

AH-ns

1.7(0.6) N=8xa

1.9(0.4) N=8xa

3.0(0.5) N=9xb

5.7(0.5) N=3xb

P<0.001

ER-s

0.2(0.1) N=7ya

0.2(0.1) N=7ya

0.4(0.1) N=8yb

0.7(0.2) N=2yc

P<0.001

ER-ns

0.4(0.1) N=7ya

0.5(0.4) N=8ya

0.1(0.4) N=8yb

0.9(0.1) N=3yb

P=0.005

RS-s

0.5(0.1) N=9y

0.8(0.1) N=8x

1.0(0.6) N=9y

1.2(0.1) N=3y

P=0.360

RS-ns

0.8(0.1) N=9ya

1.0(0.3) N=8xa

1.7(0.5) N=9yb

2.6(0.4) N=3yc

P<0.001

MTAF-s

0.2(0.1) N=7ya

0.4(0.1) N=7ya

1.1(0.3) N=7yb

0.9(0.1) N=2yb

P<0.001

MTAF-ns

0.3(0.1) N=8ya

0.5(0.1) N=9yb

1.0(0.3) N=8yc

1.1(0.2) N=3yc

P<0.001

Comp-s

3.1(0.5) N=9za

4.8(1.3) N=9za

9.6(2.1) N=10zb

11.7(1.2) N=3zb

P<0.001

Comp-ns

3.4(0.9) N=9za

5.5(0.8) N=9zb

10.8(1.9) N=10zc

0.7(1.5) N=3zd

P<0.001

P-values (material groups)

P<0.001

P<0.001

P<0.001