Table 1. Median, maximum value (Vmax) and minimum value (Vmin), the first (Q1) and third (Q3) quartile of the scores of persistence of the residues according to the dentin cleaning protocol and time-point of acid etching.

Values	G1	G2	G3	G4
Median	3b	2a	3b	1a
Vmax–Vmin	4–3	2–1	3–3	2–1
Q1–Q3	3–3	2–2	3–3	1–1

Different letters indicate significant statistical difference (p < 0.05).

G1, ethanol and immediate acid etching; G2, xylol and immediate acid etching; G3, ethanol and etching 7 days later; G4, xylol and etching 7 days later.