Table 4.

Summary of the positive associations of the genotype and allele frequency comparisons of baseline enamel microhardness assessments in the permanent teeth.

Gene	SNP			Above the Mean Enamel Microhardness Enamel [N(%)]	Below the Mean Enamel Microhardness Enamel [N(%)]	p-value
TUFT1	rs7526319					Occlusal
	Genotype		CC	8(14.2)	1(2.9)	0.01
			CT	27(48.2)	27(79.4)
			TT	21(37.5)	6(17.6)
	Allele		C	43(38.3)	29(42.6)	0.57
			T	69(61.6)	39(57.3)
	rs7526319					Lingual/Palatine
	Genotype		CC	2(3.6)	7(10.7)	0.03
			CT	37(67.2)	17(48.5)
			TT	16(29.09)	11(31.4)
	Allele		C	41(37.2)	31(44.2)	0.34
			T	69(62.7)	39(55.7)
	rs2337360					Occlusal
	Genotype		AA	9(14.7)	5(12.8)	0.03
			AG	27(44.2)	27(69.2)
			GG	25(40.9)	7(17.9)
	Allele		A	45(36.8)	37(47.4)	0.13
			G	77(63.1)	41(52.5)
	rs2337360					Lingual/Palatine
	Genotype		AA	4(6.4)	10(26.3)	0.01
			AG	38(61.2)	16(42.1)
			GG	20(32.2)	12(31.5)
	Allele		A	46(37.09)	36(47.3)	0.15
			G	78(62.9)	40(52.6)
ENAM	rs3796704					Distal
	Genotype		AA	0(0)	0(0)	0.04
			AG	3(7.6)	7(25)
			GG	36(92.3)	21(75)
	Allele		A	3(3.8)	7(12.5)	0.06
			G	75(96.1)	49(87.5)
MMP20	rs1784418					Buccal
	Genotype		CC	11(17.7)	6(15.7)	0.003
			CT	44(70.9)	17(44.7)
			TT	7(11.2)	15(39.4)
	Allele		C	66(53.2)	29(38.1)	0.03
			T	58(46.7)	47(61.8)
TFIP11	rs134136					Buccal
	Genotype		CC	9(14.5)	2(5.2)	0.9
			CT	30(48.3)	14(36.8)
			TT	23(37.09)	22(57.8)
	Allele		C	48(38.7)	18(23.6)	0.02
			T	76(61.2)	58(76.3)
AMELX	rs17878486					Mesial
	Genotype		CC	1(2.5)	1(4.5)	0.05
			CT	10(25)	12(54.5)
			TT	29(72.5)	9(40.9)
	Allele		C	12(15)	14(31.8)	0.02
			T	68(85)	30(68.1)

Bold indicates statistically significant differences.