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Progress in Orthodontics
Fig. 4 | Progress in Orthodontics

Fig. 4

From: The effect of space arrangement between anterior teeth on their retraction with clear aligners in first premolar extraction treatment: a finite element study

Fig. 4

The stress distribution pattern of the individual incisors. A The arrows indicate the direction of movement of the central incisor (left) and lateral incisor (right). B The pattern of stress distribution of the coronal tips between groups with and without spaces. The red area represents the stress concentration sites. C Individual displacement of the crown and root of the central and lateral incisors. The red bar represents the crown, and the blue bar represents the root. D Comparison of tipping of the central and lateral incisors. The red column represents the central incisor, and the blue column represents the lateral incisor. E Comparison of tipping of the central and lateral incisors under the same sagittal displacement. The red column represents the central incisor, and the blue column represents the lateral incisor. The degree of tipping = (crown − root)/[(crown + root)/2]

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