Table 1.

Means and standard deviation of bond strength (MPa).

	Antioxidants
Concentrations	Sodium ascorbate	Green tea	p Values
10%	19.58 ± 4.94 A a d	19.65 ± 4.02 A a d	.007
20%	18.15 ± 5.40 A ab	17.02 ± 7.8 A ab
30%	14.39 ± 4.97 A b	13.33 ± 5.4 A b c
p Values	.625
Positive control	20.22 ± 3.68		.004
Negative control	13.15 ± 2.89 c

Means followed by similar capital letters (row) are not significantly different, when comparing the antioxidant agents within each concentration using Tukey’s test (p < .05).

Means followed by similar lower-case letters (column) are not significantly different, when comparing the different concentrations of each antioxidant using Tukey’s test (p < .05).

^cIndicates statistically significant differences between the groups treated and the positive control, using Dunnett's test (p < .05).

^dIndicates statistically significant differences between the groups treated and the negative control, using Dunnett's test (p < .05).