Table 2. Post hoc Bonferroni pair-wise comparison of shear bond strength in the sandblast and laser groups .

Group	Comparison of different times of rebonding	Mean difference ± Std. error	P-value
Sandblast	pre vs. first	6.86 ± 3.40	0.37
	pre vs. second	6.11 ± 2.43	0.14
	pre vs. third	1.70 ± 2.39	1.00
	first vs. second	−.75 ± 3.27	1.00
	first vs. third	−5.16 ± 3.04	0.66
	second vs. third	-4.41 ± 1.64	0.10
Laser	pre vs. first	10.56 ± 3.36	0.04*
	pre vs. second	12.65 ± 3.09	0.007*
	pre vs. third	12.65 ± 3.12	0.007*
	first vs. second	2.09 ± 2.59	1.00
	first vs. third	2.09 ± 2.09	1.00
	second vs. third	001 ± 1.37	1.00

Statistically significant (P < 0.05)