Table 3:

Mean and within-subject effects comparison between mean values of baseline surface microhardness, baseline enamel surface microhardness of artificial lesion, and final surface microhardness values of group I, group II, group III, and group IV test specimens

Group	VHN	Mean	SD	N	Source	Type III sum of squares	df	Mean square	F	p-value
Group I	SH0	322.8	13.0	10	Huynh–Feldt	490,252.066	1.052	465,849.530	1,779.042	0.0005
	SH1	42.7	12.5	10
	SH2	61.5	13.8	10
Group II	SH0	320.9	11.1	10	Huynh–Feldt	404,739.653	1.019	397,104.291	1,837.920	0.0005
	SH1	50.9	13.8	10
	SH2	108.2	12.8	10
Group III	SH0	336.2	14.2	10	Huynh–Feldt	468,269.858	1.212	386,432.638	1,689.973	0.0005
	SH1	43.6	12.8	10
	SH2	112.2	16.3	10
Group IV	SH0	330.3	7.5	10	Sphericity assumed	469,214.402	2	234,607.201	6,017.653	0.0005
	SH1	45.1	11.7	10
	SH2	90.7	11.2	10