Table 2.

Initial and final microhardness measurements of enamel samples.

Analysis Groups	KHN (mean ± SD)		P
	Initial	Final
G1 - 35% HP S/F	259.89 ± 18.44	205.22 ± 31.47	.0030 a
G2 - 35% HP FN	266.37 ± 27.84	205.33 ± 31.56	.0540 a
G3 - 35% HP FFA	256.2 ± 13.05	198.06 ± 28.32	.0111 a
G4 - 35% HP w/ Ca S/F	241.30 ± 21.41	210.11 ± 48.06	.2216 a
G5 - 35% HP w/ Ca FN	271.12 ± 27.24	283.66 ± 28.28	.1297 a
G6 - 35% HP w/ Ca FFA	225.24 ± 25.94	196.90 ± 20.85	.1858 a

^aStudent’s t-test for for independent samples.

SD, standard deviation.