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Finite element analysis reveals biomechanical advantages of attachment positioning in maxillary expansion, indicating improved crown displacement and torque control.
Maxillary arch expansion with clear aligners is primarily achieved by buccal inclination of the posterior teeth. The configuration combining buccal attachments with palatal pressure ridges demonstrates biomechanical advantages, including enhanced crown displacement, better torque control, and favorable stress distribution.
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Zheng et al. (2026) studied this question.
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