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Progress in Orthodontics
Fig. 1 | Progress in Orthodontics

Fig. 1

From: The effect of enhanced structure in the posterior segment of clear aligners during anterior retraction: a three-dimensional finite element and experimental model analysis

Fig. 1

Three-dimensional finite element model: A, Alveolar bone; B, Periodontal ligament; C, Maxillary dentition without the first premolars; D, Clear aligner; E, The assembled research model; F–H, Clear aligner with the enhanced structure in different views; I-J, Local coordinate system for each tooth

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