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Progress in Orthodontics
Fig. 8 | Progress in Orthodontics

Fig. 8

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

Fig. 8

Stress distribution of the canine when the incisors were intruded by 0.2 mm. I. von Mises stress distribution of the canine: The stress was concentrated around the cusps, distal labial inclined planes, and attachments. The stress of the root was concentrated in the mesial cervical 1/3 area of the labial surface. With the increase in the initial IMPA, the stress did not change significantly, II. The maximum principal stress distribution of the canine (when the IMPA was 100°): The tensile stress was widely distributed in the cervical 1/2 of all the root surfaces. The maximum principal stress on the labial and lingual surfaces was basically symmetrical. The maximum principal stress on the distal surface was greater than that on the mesial surface. III. The maximum principal stress distribution in the PDL of the canine (when the IMPA is 100°): The maximum principal stress on the mesial, labial and distal surfaces was the same as that of the root. However, on the lingual surface, tensile stress was concentrated in the apical 1/2 of the PDL

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