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Dentoalveolar Changes in the Premolar Region After Two Maxillary Expansion Protocols
Jaqueline Peter1, Fabiane Azeredo1, Susana Maria Deon Rizzatto1
1Department of Orthodontics, School of Health and Life Sciences (Dental Program), Pontifical Catholic University of Rio Grande Do Sul, Porto Alegre, Brazil.
Orthodontics & Craniofacial Research
|April 11, 2026
Summary
Both rapid maxillary expansion (RME) and alternate rapid maxillary expansion and constriction (Alt-RAMEC) protocols similarly affected upper first premolars, reducing alveolar bone thickness. Alt-RAMEC showed a tendency for greater tooth inclination.
Area of Science:
- Orthodontics
- Dentofacial Orthopedics
- Craniofacial Biology
Background:
- Maxillary expansion is a common orthodontic procedure.
- Understanding dentoalveolar effects is crucial for treatment planning.
Purpose of the Study:
- To compare the dentoalveolar effects of rapid maxillary expansion (RME) and alternate rapid maxillary expansion and constriction (Alt-RAMEC) on upper first premolars.
- To evaluate changes before and 6 months after treatment.
Main Methods:
- Cone-Beam Computed Tomography (CBCT) evaluated 20 patients treated with Hyrax appliance.
- Measurements included tooth length, alveolar bone level, and thickness at the premolar region.
- Statistical analyses used Shapiro-Wilk and Student's t-tests.
Main Results:
- Both RME and Alt-RAMEC significantly increased interpremolar distances (coronal and radicular).
- Greater coronal than root distance increase was observed, more pronounced with Alt-RAMEC.
- Alveolar thickness showed an average reduction of 0.54 mm post-expansion.
Conclusions:
- RME and Alt-RAMEC yielded similar effects on upper first premolars, reducing alveolar thickness.
- Alt-RAMEC showed a tendency towards greater tooth inclination and root reduction.
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