Table 1. The µTBS mean values (MPa) and standard deviations of the experimental groups.

Adhesive	Baseline analysis (24 h)		After aging (6-months degradation)
	without chitosan	with chitosan	without chitosan	with chitosan
Etch-and-rinse	31.48 ± 9.67Ab	37.25 ± 11.33Aa	28.94 ± 5.57Ab	38.00 ± 8.96Aa
Self-etch	28.02 ± 7.17Ab	33.89 ± 10.94Aa	31.44 ± 5.57Ab	36.77 ± 8.04Aa

Same capital letters denote groups that are not statistically different in the comparison within lines (p<0.05).

Same lowercase letters denote groups that are not statistically different in the comparison within columns (p<0.05).