Table 2.

Descriptive statistics (in MPa) of shear bond strengths of the 6 groups tested (each group consisted of 20 specimens).

Group	Appliance	Contamination	Mean	SD	Min	Median	Max	Tukey*
1	Orthodontic bracket	Dry environment	14.65	3.21	7.34	13.78	21.11	A
2	Orthodontic bracket	Water contamination	3.33	1.53	1.34	3.28	5.78	B
3	Orthodontic bracket	Saliva contamination	3.12	1.01	1.14	3.02	5.34	B
4	Disinclusion button	Dry environment	14.04	2.23	9.98	14.55	20.43	A
5	Disinclusion button	Water contamination	5.89	1.21	3.95	5.96	7.94	C
6	Disinclusion button	Saliva contamination	5.78	0.97	4.07	5.88	7.03	C

*Tukey grouping: means with the same letter are not significantly different.