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Progress in Orthodontics
Fig. 1 | Progress in Orthodontics

Fig. 1

From: Stress and movement trend of lower incisors with different IMPA intruded by clear aligner: a three-dimensional finite element analysis

Fig. 1

Changes in the relationship between the root and the alveolar bone during the intrusion of mandibular incisors. Rectangular attachments were set on the labial surface on the lower canines. Four mandibular incisors were simultaneously intruded. The CBCT images of the mandibular left lateral incisor are displayed. A The movement data from top to bottom are extrusion (E) or intrusion (I), labial movement (B) or lingual movement (L), mesial movement (M) or distal movement (D), mesial rotation (M) or distal rotation (D), mesial inclination (M) or distal inclination (D), labial inclination (B) or lingual inclination (L). B Before intrusion, although the alveolar bone on the root labial surface was thin, the root was located in the alveolar bone. The designed direction of intrusion was basically along the tooth axis. C After the intrusion of 2.2 mm, the root moved to the labial side and separated from the alveolar bone

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