Different biomechanical effects of clear aligners in bimaxillary space closure under two strong anchorages: finite element analysis

Progress in Orthodontics

Table 3 Vertical movement of teeth in different groups

	Anterior teeth			Posterior teeth
	1	2	3	5	6	7
Moderate anchorage group (maxilla)	1.381E	0.981E	0.339E	− 0.318I	− 0.167I	0.686E
Moderate anchorage group (mandible)	1.720E	1.264E	0.344E	− 0.342I	− 0.079I	0.827E
Indirect anchorage group (maxilla)	1.562E	1.115E	0.404E	− 0.512I	− 0.134I	0.429E
Indirect anchorage group (mandible)	1.738E	1.255E	0.323E	− 0.652I	− 0.143I	0.295E
Direct anchorage group (maxilla)	1.407E	0.849E	0.088E	− 0.272I	− 0.143I	0.581E
Direct anchorage group (mandible)	1.635E	1.086E	0.144E	− 0.275I	− 0.068I	0.684E

+ values indicate extrusion of teeth (× 10⁻² mm); − values indicate intrusion of teeth (× 10⁻² mm); E, tooth extrusion based on the occlusal plane; I, tooth intrusion based on the occlusal plane; 1, central incisor; 2, lateral incisor; 3, canine; 5, second premolar; 6, first molar; 7, second molar