Table 1. Average values of elements found in the enamel enamel expressed in % mass in all three groups (semi-quantitative EDX point analysis): Transbond XT Light Cure Adhesive (3M Unitek Orthodontic Products, USA) b) Heliosit Orthodontic (Ivoclar Vivadent, Schaan, Liechtenstein) c) Fuji Ortho LC (GC Corporation, Japan), bonded to metallic and ceramic brackets.

	Transbond XT						Heliosit Orthodontic						Fuji Ortho LC
	Metallic bracket			Ceramic bracket			Metallic bracket			Ceramic bracket			Metallic bracket			Ceramic bracket
	Nr.	Avg.	StD	Nr.	Avg.	StD	Nr.	Avg.	StD	Nr.	Avg.	StD	Nr.	Avg.	StD	Nr.	Avg.	StD
Group tested 1 week after bonding
Mg	13	0.09	0.03	13	0,1	0,037	12	0.1	0.1	13	0.1	0.0	10	0.1	0.05	12	0.1	0.0
Si	13	0.6	0.2	13	0,4	0,1	13	0.5	0.2	13	0.1	0.1	12	0.2	0.1	13	0.2	0.1
P	13	19.2	3.9	13	15,3	1,3	13	16.1	2.4	13	14.6	1.6	13	16.8	2.2	13	14.5	1.5
S	13	0.8	0.3	13	0,6	0,1	13	0.8	0.3	13	0.3	0.1	13	0.3	0.1	13	0.3	0.1
Ca	13	43.9	12.5	13	31.0	3,1	13	33.7	6.1	13	29.8	3.8	13	37.6	6.3	13	30.9	3.5
F	/	/	/	/	/	/	/	/	/	/	/	/	13	0.7	0.2	13	0.7	0.5
Group 2 tested 2 weeks after bonding
Mg	5	0.1	0.0	13	0,1	0,0	11	0.1	0.0	12	0.1	0.0	7	0.1	0.0	11	0.1	0.03
Si	10	0.1	0.0	11	0,2	0,2	11	0.1	0.0	13	0.1	0.0	13	0.6	1.5	13	0.5	0.1
P	13	14.7	0.9	13	15,5	1,8	13	17.9	2.03	13	17.6	1.9	13	15.7	2.3	13	15.5	3.2
S	8	0.2	0.1	10	0,1	0,042	4	0.1	0.0	7	0.1	0.0	6	0.1	0.1	13	1.05	0.3
Ca	13	30.4	2.4	13	31,1	4,6	13	37.2	4.9	13	37.0	3.9	13	34.9	6.8	13	33.4	12.5
F	/	/	/	/	/	/	/	/	/	/	/	/	12	1.0	0.4	12	0.5	0.4
Group tested 3 weeks after bonding
Mg	12	0.1	0.0	12	0,1	0,0	10	0.2	0.0	12	0.1	0.0	5	0.2	0.1	9	0.1	0.1
Si	11	0.2	0.2	12	0,1	0,1	6	0.1	0.1	10	0.2	0.07	13	0.2	0.1	13	0.1	0.04
P	13	17.1	2.2	13	17,8	1.0	10	18.6	2.7	13	15.6	1.8	13	17.0	2.2	13	16.4	2.7
S	13	0.2	0.2	13	0,1	0,1	5	0.2	0.1	11	0.2	0.1	11	0.2	0.1	9	0.1	0.1
Ca	13	38.4	9.4	13	38,1	3,2	10	39.1	8.0	13	33.7	7.6	13	40.6	8.3	13	38.2	9.7
F	/	/	/	/	/	/	/	/	/	/	/	/	9	1.5	1.1	9	1.3	0.8