In Vitro Effects of Two Topical Varnish Materials and Er:YAG Laser Irradiation on Enamel Demineralization around Orthodontic Brackets

Table 1

Multiple comparisons of microhardness values of specimens from 3 positions and 5 depths from the coronal side of bracket surface.

Distances from bracket surface	Depths	Er:YAG laser group		Control group		TCP group		ACP group		𝑃
		Mean	SD	Mean	SD	Mean	SD	Mean	SD
0 μm	10 μm	331.31	25.64	323.81	31.48	362.83	37.95	351.42	24.60	0.009*
	20 μm	335.90	26.42	323.91	20.89	378.53	23.12	355.36	20.47	0.000*
	40 μm	322.92	25.55	312.21	22.59	373.44	12.85	355.17	24.90	0.000*
	70 μm	306.69	22.51	291.20	26.20	356.37	16.32	330.87	25.43	0.000*
	90 μm	283.63	21.76	286.20	15.96	345.10	19.68	321.30	23.83	0.000*
100 μm	10 μm	358.05	14.52	350.14	17.76	393.68	11.28	364.23	6.15	0.000*
	20 μm	359.67	14.78	348.88	29.11	392.84	10.88	370.85	7.64	0.000*
	40 μm	347.35	16.69	338.79	23.86	380.27	10.51	358.81	22.92	0.000*
	70 μm	327.77	17.69	313.54	31.97	367.99	11.41	329.78	25.81	0.000*
	90 μm	311.72	23.71	302.04	31.74	352.48	12.13	318.90	24.99	0.000*
200 μm	10 μm	361.07	10.87	331.81	30.32	392.05	10.54	356.75	15.67	0.000*
	20 μm	356.66	13.52	338.37	16.48	385.45	13.96	353.79	18.20	0.000*
	40 μm	668.70	1042.84	320.36	30.06	367.85	12.02	348.08	18.67	0.002*
	70 μm	315.02	20.18	294.23	30.15	357.53	11.86	334.81	18.65	0.000*
	90 μm	289.22	34.87	276.30	28.59	344.01	13.13	318.49	24.44	0.000*

 *𝑃<0.05: significance level; SD: standard deviation.