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

Progress in Orthodontics

Table 7 Significant tipping movement of teeth in different anchorage groups

Tooth	Anterior teeth			Posterior teeth
Tooth	1	2	3	5	6	7
Moderate anchorage group (maxilla)	− 14.440L	− 13.186L	12.962D	− 7.356 M	− 5.895 M	− 4.956 M
Moderate anchorage group (mandible)	− 23.441L	− 18.700L	13.800D	− 5.423 M	− 4.190 M	− 3.725 M
Indirect anchorage group (maxilla)	− 16.201L	− 14.733L	14.452D	− 6.728 M	− 3.818 M	− 3.127 M
Indirect anchorage group (mandible)	− 25.876L	− 20.421L	15.198D	− 4.986 M	− 2.172 M	− 1.755 M
Direct anchorage group (maxilla)	− 15.828L	− 13.789L	13.951D	− 6.326 M	− 4.995 M	− 4.207 M
Direct anchorage group (mandible)	− 25.605L	− 20.155L	14.913D	− 4.551 M	− 3.482 M	− 3.053 M
150 g elastic force group (maxilla)	− 1.308L	− 0.842L	1.294D	1.602D	1.349D	1.220D
150 g elastic force group (mandible)	− 1.476L	− 1.236L	1.109D	1.491D	1.202D	1.220D

+ Values indicate the tipping movement in the buccal or distal direction (× 10⁻² mm); − values indicate the lingual or mesial direction (× 10⁻² mm); the direction is also marked after the value. B, buccal movement; L, lingual movement; M, mesial movement; D, distal movement. 1, central incisor; 2, lateral incisor; 3, canine; 5, second premolar; 6, first molar; 7, second molar. The calculation of buccal/lingual and mesial/distal tipping change is described in the Methodology section