Upper arch expansion and spontaneous upper first molar distorotation with Ni–Ti leaf springs and rapid maxillary expander compared to clear aligners

Alessandro Ugolini; Alessandro Bruni; Andrea Abate; Cinzia Maspero; Francesca Silvestrini-Biavati; Valentina Lanteri

doi:10.1007/s00056-026-00649-7

March 12, 2026Journal of Orofacial Orthopedics / Fortschritte der KieferorthopädieOpen Access

Upper arch expansion and spontaneous upper first molar distorotation with Ni–Ti leaf springs and rapid maxillary expander compared to clear aligners

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Key Points

The research aims to evaluate the effectiveness of different orthodontic appliances on dental expansion and molar rotation.
Compared dentoalveolar expansion levels between clear aligners and rapid maxillary expanders.
Assessed spontaneous molar distorotation using Ni–Ti leaf springs and compared with planned outcomes.
Utilized clinical measurements to analyze the effects of each intervention.
Dentoalveolar expansion levels were comparable between clear aligners and maxillary expanders.
Spontaneous distorotation of the upper first molar was similar with leaf springs and planned with clear aligners.
Distorotation with rapid maxillary expander was significantly less than with other methods.

Implication

Compares dental expansion and molar rotation between clear aligners and maxillary expanders, suggesting effective alternatives.

Abstract

Both CA and maxillary expanders fixed to upper primary molars produced comparable levels of dentoalveolar expansion. The spontaneous distorotation of the U6 obtained with LE was similar to the planned distorotation achieved with CA and significantly higher than that observed with RME.

Discussion

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Cite This Study

Ugolini et al. (2026) studied this question.

synapsesocial.com/papers/69b79d538166e15b153aac2b https://doi.org/10.1007/s00056-026-00649-7

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Upper arch expansion and spontaneous upper first molar distorotation with Ni–Ti leaf springs and rapid maxillary expander compared to clear aligners

Key Points

Implication

Abstract

Discussion

Cite This Study

Upper arch expansion and spontaneous upper first molar distorotation with Ni–Ti leaf springs and rapid maxillary expander compared to clear aligners

Key Points

Implication

Abstract

Discussion

Cite This Study

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