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Updated: May 17, 2026
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Finite Element Analysis Model for Assessing Expansion Patterns from Surgically Assisted Rapid Palatal Expansion
Published on: October 20, 2023
[Three-dimensional changes of maxilla after rapid maxillary expansion]
1Department of Stomatology, People's Hospital of Shenzhen, Shenzhen Guangdong 518020, China.
Summary
Rapid maxillary expansion (RME) causes significant three-dimensional changes in the maxilla. Spiral CT imaging effectively visualizes these complex skeletal alterations, aiding in treatment evaluation.
Area of Science:
- Dentistry
- Orthodontics
- Craniofacial Imaging
Background:
- Rapid maxillary expansion (RME) is a common orthodontic treatment to widen the constricted maxilla.
- Understanding the three-dimensional (3D) skeletal changes induced by RME is crucial for effective treatment planning and outcome assessment.
Purpose of the Study:
- To investigate the detailed 3D volumetric and positional changes of the maxilla following RME treatment.
Main Methods:
- Utilized spiral computed tomography (CT) scans for precise 3D analysis.
- Established a 3D reference framework to accurately measure maxillary displacements and rotations.
- Included ten patients who underwent RME therapy.
Main Results:
- Observed downward and forward displacement of key maxillary landmarks (ANS, PNS).
- Noted clockwise rotation of the mid-sagittal plane (ANS-PNS plane), while the true maxillary position remained stable in this plane.
- Demonstrated a spindle-shaped expansion of the mid-palatal suture, wider centrally and tapering at the ends.
- Revealed rotation of the maxillary halves in the frontal plane.
Conclusions:
- RME treatment induces complex 3D skeletal alterations in the maxilla.
- Spiral CT is a valuable tool for the comprehensive 3D evaluation of maxillary changes after RME.
