Table 2.

Mean Values and Standard Deviations of Weight Percentages for Each Element of the Crater and Periphery on the Enamel Surface

Group	N	Ca		P		O		Cl
Control group I	12	31.4 ± 3.5A		17.3 ± 2.3A		44.4 ± 3.3A		0.6 ± 0.1A,C
Experimental groups	N	Crater	Periphery	Crater	Periphery	Crater	Periphery	Crater	Periphery
II	12	33.4A,C ± 7.6	33.3A,C ± 10.1	17.1A ± 2.6	16.6A ± 1.6	44.2A ± 10.0	42.5A ± 13.3	0.6A,B ± 0.1	0.6A,C ± 0.1
III	12	41.1B ± 12.2	30.4C ± 4.1	17.5A ± 1.9	17.9A ± 1.7	38.4A ± 12.5	47.8A ± 5.8	0.7B ± 0.1	0.5A,C ± 0.2
IV	12	29.2A,C ± 4.8	25.0D ± 5.0	17.0A ± 2.1	*13.9B ± 2.1	49.9A ± 6.8	47.3A ± 10.9	0.6A,B ± 0.1	0.5C ± 0.1

^*Groups with different letters are significantly different (p ≤ 0.05), statistical analysis by element.