Table 2.

Displacement tendency of the anterior teeth in the three groups

The displacement tendency (mm)		11	12	13
Without attachment	Total	0.089	0.080	0.077
	X	0.016	0.045	0.050
	Y	0.028	0.025	0.022
	Z	0.019	0.016	0.022
With horizontal attachment	Total	0.075	0.070	0.069
	X	0.013	0.042	0.045
	Y	0.023	0.021	0.019
	Z	0.016	0.015	0.020
With vertical attachment	Total	0.075	0.071	0.069
	X	0.013	0.042	0.046
	Y	0.023	0.021	0.019
	Z	0.016	0.015	0.020

11, the central incisor; 12, the lateral incisor; 13, the canine