Table 2: Regional microshear bond strengths of dentin bonding system after treatment with different irrigation solutions (MPa).

Irrigation Solutıons
Distilled water NaOCl EDTA/NaOCl Chlorhexidine
Enamel-dentin junction
Single Bond Universal
Self-etch 28.6 (6.86)a 19.2 (2.77)b 17.0 (2.41)c 19.6 (3.85)b
Etch & rinse 28.2 (6.80)a 18.9 (4.40)b 20.1 (4.66)b 21.7 (2.64)b
F = 9.600 P = 0.000, P < 0.005
Coronal dentin
Single Bond Universal
Self-etch 26.7 (3.37)a 21.7 (2.65)b 20.8 (4.59)b 21.0 (2.21)b
Etch & rinse 26.0 (3.37)a 18.9 (2.21)c 20.1 (3.90)b,c 21.2 (2.88)b
F = 5.641 P = 0.000, P < 0.005
Pulp dentin chamber
Single Bond Universal
Self-etch 26.3 (3.60)a 18.3 (2.85)b 18.1 (3.17)b 17.5 (2.86)b
Etch & rinse 25.2 (3.06)a 15.1 (4.25)c 14.6 (3.88)c 20.7 (1.08)b
F = 18.586 P = 0.000, P < 0.005
Floor of the pulp
Single Bond Universal
Self-etch 12.0 (1.61)a 9.8 (1.11)b 8.8 (1.21)b 8.6 (1.17)b
Etch & rinse 11.8 (1.06)a 8.7 (1.71)b 8.9 (1.62)b 9.8 (0.58)a,b
F = 18.084 P = 0.000, P < 0.005

In each row, means with the same lower case superscript letters indicate a nonsignificant difference between groups (p > 0.05).