TABLE 1. Mean value of superficial microhardness (KHN) and standard deviation before and after prophylaxis and after immersion in artificial saliva in the different times of treatment.

Group	Mean	Standard deviation	Tukey test
MI	359.80	22.41	ac
MII	335.46	32.94	b
MIII	369.20	26.01	a
MIV	377.73	21.30	a
MV	341.86	26.04	bc

Same letters denote no statistically significant difference (p>0.05) by Tukey test