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Progress in Orthodontics
Fig. 4 | Progress in Orthodontics

Fig. 4

From: The predictability of orthodontic tooth movements through clear aligner among first-premolar extraction patients: a multivariate analysis

Fig. 4

Effects of canine attachments on incisor retraction. A No attachment on canines. Before wearing aligner. B The aligner was put onto the dentition. C Due to the retraction force and the additional lingual root-torquing force, the aligner tended to move incisally. D–F Optimized attachment on canine. Due to the inadequate retention offered by optimized attachments, the aligner tended to move incisally. G–I Vertical attachment on canine. Due to the adequate retention offered by the bulky vertical attachment, the aligner was retained in position

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