Table 3.

Post hoc Tukey honestly significant difference analysis for multiple comparisons between various groups at baseline, after demineralization, and after remineralization

SMH	Groups	Mean difference	SE	P	SMH	Mean difference	SE	P	SMH	Mean difference	SE	P
At baseline	1-2	4.17	7.775	0.994	After	3.92	7.236	0.994	After	8.42	7.876	0.892
	1-3	5.58	7.775	0.979	DMZ	5.58	7.236	0.971	RML	6.25	7.876	0.967
	1-4	−5.92	7.775	0.973		−7.58	7.236	0.899		26.92	7.876	0.015*
	1-5	7.33	9.523	0.971		2.50	8.863	1.000		44.42	9.646	<0.001*
	1-6	5.50	9.523	0.992		3.17	8.863	0.999		52.08	9.646	<0.001*
	2-3	1.42	7.775	1.000		1.67	7.236	1.000		−2.17	7.876	1.000
	2-4	−10.08	7.775	0.785		−11.50	7.236	0.609		18.50	7.876	0.193
	2-5	3.17	9.523	0.999		−1.42	8.863	1.000		36.00	9.646	0.006*
	2-6	1.33	9.523	1.000		−0.75	8.863	1.000		43.67	9.646	<0.001*
	3-4	−11.50	7.775	0.679		−13.17	7.236	0.462		20.67	7.876	0.109
	3-5	1.75	9.523	1.000		−3.08	8.863	0.999		38.17	9.646	0.003*
	3-6	−0.08	9.523	1.000		−2.42	8.863	1.000		45.83	9.646	<0.001*
	4-5	13.25	9.523	0.732		10.08	8.863	0.863		17.50	9.646	0.466
	4-6	11.42	9.523	0.835		10.75	8.863	0.829		25.17	9.646	0.113
	5-6	−1.83	10.996	1.000		0.67	10.234	1.000		7.67	11.138	0.983

*Significant difference P<0.05. SMH: Surface microhardness; DMZ: Demineralization; RML: Remineralization; SE: Standard error; SD: Standard deviation