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Updated: Jul 11, 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 finite element analysis of craniofacial skeleton protraction at medium position]
Min Hou1, Chun-ming Liu, Hai-zhong Zhang
1Department of Orthognathic Surgery, Tianjin Stomatological Hospital, Tianjin 300041, China.
Zhonghua Zheng Xing Wai Ke Za Zhi = Zhonghua Zhengxing Waike Zazhi = Chinese Journal of Plastic Surgery
|October 12, 2007
Summary
Midface skeleton protraction at its medium position advances the maxilla en bloc, reducing counterclockwise rotation and palatal constriction. This method offers improved biomechanical changes compared to traditional orthopedic protraction.
Area of Science:
- Craniofacial biomechanics
- Orthodontic research
- Finite element analysis
Context:
- Midface hypoplasia is a common condition requiring orthopedic intervention.
- Traditional protraction methods can lead to undesirable side effects.
- Optimizing protraction force application is crucial for predictable outcomes.
Purpose:
- To investigate the biomechanical effects of midface skeleton protraction at its medium position.
- To compare these effects with traditional protraction methods using three-dimensional finite element analysis (FEM).
Summary:
- A three-dimensional FEM model was created from CT scans to simulate protraction forces applied at the first molar, full maxillary arch, and floor of aperture piriformis.
- Protraction at the floor of aperture piriformis resulted in greater anterior maxillary movement with less vertical and lateral displacement compared to tooth or denture loading.
- This approach reduced compressive stress on the radix nasi.
Impact:
- Midface skeleton protraction at its medium position enables en bloc maxillary advancement.
- It decreases counterclockwise maxillary rotation and anterior palatal constriction.
- This offers a potentially more effective approach for correcting midface deficiencies.
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