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March 7, 2026American Journal of Orthodontics and Dentofacial Orthopedics0 citationsOpen Access

Stability of transverse changes with clear aligners and hyrax expanders from the mixed to the permanent dentition

ATAndrew TsaiHSHeeyeon SuhSTSandra Khong Tai

Key Points

  • To evaluate the stability of transverse changes in the maxillary and mandibular arches during the transition from mixed to permanent dentition.
  • Comparison of maxillary arch expansion from clear aligners (IFS) and hyrax expanders.
  • Assessment of mandibular arch changes and their stability over time.
  • Evaluation of longitudinal effects on dental structure.
  • Both IFS and hyrax produced consistent maxillary arch expansion throughout the transition period.
  • IFS also resulted in stable mandibular arch expansion, indicating its effectiveness for mild crowding.
  • No long-term vertical effects were noted with the use of IFS.

Abstract

Both IFS and hyrax produced maxillary arch expansion that was maintained throughout the transition from mixed to permanent dentition. The IFS also showed stable mandibular arch expansion, supporting its use for mild crowding or transverse deficiencies without long-term vertical effects.

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Cite This Study

Tsai et al. (2026) studied this question.

synapsesocial.com/papers/69abc0de5af8044f7a4e9752https://doi.org/10.1016/j.ajodo.2026.01.017
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