Table 2.

Bonferroni test comparison of mean shear bond strength between four groups

Group	Mean + SD	P value
Total-etch (MPa)	28.25 ± 2.53	0.002
Self-etch (MPa)	25.15 ± 3.28
Total-etch (MPa)	28.25 ± 2.53	<0.001
Total-etch + CHX	46.20 ± 2.55
Total-etch (MPa)	28.25 ± 2.53	0.090
Self-etch + CHX	29.45 ± 1.76
Self-etch (MPa)	25.15 ± 3.28	<0.001
Total-etch + CHX	46.20 ± 2.55
Self-etch (MPa)	25.15 ± 3.28	<0.001
Self-etch + CHX	29.45 ± 1.76
Total-etch + CHX	46.20 ± 2.55	<0.001
Self-etch + CHX	29.45 ± 1.76

CHX = 2% chlorhexidine