Table 1. The Mean and Standard Deviation of the Microhardness of Samples in Different Groups at Different Depths .

Groups	0 µ		50 µ		100 µ		150 µ
	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Saliva	402.39	32.38	379.27	45.48	384.56	31.48	340.45	30.45
Control	417.69	20.15	391.51	49.63	359.54	43.29	333.45	40.43
MI Paste Plus	393.64	11.23	390.98	11.51	361.48	14.20	349.60	11.75
Laser	409.65	27.17	397.00	34.06	373.45	28.11	364.76	22.29
Laser + MI Paste Plus	446.44	30.50	435.53	21.86	421.78	25.07	420.15	31.71
P value	0.001		<0.0001		<0.0001		<0.0001