Table 3.

P/N atomic ratios (mean ± SD). In columns, identical superscript lowercase letters represent no statistical differences (two-way ANOVA followed by an RM Student–Newman–Keuls test) among tested solutions (P ≥ 0.05). In the horizontal rows, identical superscript uppercase letters represent no statistical differences (one-way ANOVA for repeated measures followed by an RM Student–Newman–Keuls test) among evaluation times (P ≥ 0.05).

Treatments	Smear Layer	T0	24 Hours	2 Months
1% EDTA	0.62 ± 0.05 Aa	0.41 ± 0.02 Aa	0.48 ± 0.10 Aa	1.80 ± 0.46 Ba
10% EDTA	0.61 ± 0.07 Aa	0.29 ± 0.02 Ba	0.23 ± 0.03 Ba	0.65 ± 0.35 Ab
17% EDTA	0.53 ± 0.06 Aa	0.48 ± 0.03 Aa	0.47 ± 0.04 Aa	1.11 ± 0.27 Bc
10% Citric acid	0.79 ± 0.03 Aa	0.19 ± 0.01 Ba	0.22 ± 0.02 Ba	0.22 ± 0.01 Bd
Control	0.65 ± 0.06 Aa	0.82 ± 0.03 Bb	0.78 ± 0.06 Bb	1.04± 0.14 Bc