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A Finite Element Approach for Locating the Center of Resistance of Maxillary Teeth
Published on: April 8, 2020
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Facemask application with fixed orthodontic appliances: 3-dimensional finite element stress analysis
Başak Arslan Avan1, Cumhur Tuncer1
1Gazi University, Faculty of Dentistry, Department of Orthodontics, Ankara, Turkiye.
Journal of Stomatology, Oral and Maxillofacial Surgery
|December 12, 2024
Summary
Facemask (FM) therapy using fixed orthodontic appliances can cause stress on craniofacial structures. This analysis reveals significant stress in the anterior maxilla and sutures, with maxillary rotation and arch narrowing observed.
Area of Science:
- Orthodontics
- Craniofacial Biology
- Biomechanical Engineering
Background:
- Facemask (FM) therapy is a common orthopedic treatment for maxillary retrognathia.
- This study investigates the biomechanical effects of tooth-supported FM application using fixed orthodontic appliances.
Purpose of the Study:
- To assess the stress distribution and displacement patterns in craniofacial structures during tooth-supported facemask therapy.
- To evaluate the impact on maxillary bones, sutures, and dentition using finite element stress analysis.
Main Methods:
- A 3D finite element model of the maxilla with fixed orthodontic appliances was created.
- Facemask (FM) forces (350g at 30° to occlusal plane) were applied to evaluate stress and displacement.
- Analysis focused on craniofacial bones, sutures, intraoral anchoring units, and maxillary teeth.
Main Results:
- High stress concentrations were identified in the anterior maxilla, pterygomaxillary region, and zygomatic bone.
- Significant stress was observed in the zygomaticotemporal, zygomaticofrontal, and pterygomaxillary sutures.
- Maxillary displacement, counterclockwise rotation, and transversal dental arch narrowing were noted.
Conclusions:
- Tooth-supported facemask (FM) therapy generates considerable stress on craniofacial structures, particularly the anterior maxilla and sutures.
- Observed displacements include maxillary rotation and dental arch narrowing, necessitating careful clinical application.
- Consideration of rigid archwires or auxiliary support mechanics like transpalatal arches is recommended for optimal FM therapy outcomes.
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