Table 1.

Calcium and phosphorus contents (percentage) of the enamel in the five groups

Element	Groups	Mean Difference	Std. Error	Sig.	95% confidence interval
					Lower bound	Upper bound
Ca	Fluoride	16.41	3.42	0.001	5.98	26.84
	Blue Laser	2.32	3.42	0.983	-8.10	12.74
	Er:YAG laser	4.50	3.42	0.775	-5.92	14.93
	Fluoride + Blue laser	-0.32	3.42	1.000	-10.75	10.89
	Fluoride + Er:YAG laser	3.84	3.42	0.869	-6.58	14.27
P	Fluoride	3.07	2.56	0.834	-4.73	10.89
	Blue Laser	-2.00	2.56	0.969	-0.81	5.80
	Er:YAG laser	-2.05	2.56	0.965	-9.86	5.75
	Fluoride + Blue laser	-1.66	2.56	0.986	-9.47	6.14
	Fluoride + Er:YAG laser	1.21	2.56	0.997	-6.60	9.02