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Progress in Orthodontics
Fig. 7 | Progress in Orthodontics

Fig. 7

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

Fig. 7

Force system analysis of the canine during the intrusion of incisors. The X-axis is the initial IMPA of the incisors, and the Y-axis is the moment and the force, respectively. The black dot in the figure is the CR, and the arrow represents the direction of the moment or force. A. The mesiodistal moment of the canine: The positive value represents the distal crown moment. The canine was subjected to distal crown moment. With the increase in the IMPA, the distal crown moment decreased overall. B. The mesiodistal force of the canine: The positive value represents the force toward the mesial direction. The CR of the canine was always subjected to the force in the mesial direction, and there was no significant change with the increase in the IMPA. C. The vertical force value of the canine: The positive value represents the extrusive force. The canine was subjected to an obvious extrusive force. With the increase in IMPA, the extrusive force value showed no significant change

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