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Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
Published on: February 23, 2024
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Finite element analysis on pushing the molar backwards using invisible aligner with different migration displacement
Jiwu Zhang1, Lili Ma2, Yuzhongxiu Ren3
1Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, China.
Acta of Bioengineering and Biomechanics
|February 5, 2024
Summary
A 0.2 mm displacement aligner is more effective for initial tooth movement than a 0.3 mm one. This invisible aligner technique study shows less periodontal ligament stress with smaller displacements.
Area of Science:
- Biomechanical analysis of orthodontic tooth movement.
- Finite element method (FE) simulations in dental mechanics.
Background:
- Invisible aligners are increasingly used in orthodontic treatments.
- Understanding the biomechanical forces is crucial for effective tooth movement.
Purpose of the Study:
- To investigate the biomechanical mechanisms of tooth movement using invisible aligner techniques.
- To compare the effects of different aligner displacements on tooth and periodontal ligament (PDL) behavior.
Main Methods:
- Simulated tooth movement of the maxillary second molar using the finite element (FE) method.
- Designed two aligner models with different displacements: 0.2 mm (Model A) and 0.3 mm (Model B).
Main Results:
- Maximum stress concentration observed on the distal and palatal surfaces of the PDL.
- Model B (0.3 mm displacement) exhibited higher PDL stress compared to Model A (0.2 mm displacement).
- The second molar displacement in Model A was 44.9% less than in Model B, with a displacement of 0.027 mm.
Conclusions:
- Aligners providing 0.2 mm displacement are more suitable for initial distal molar movement.
- Tooth displacement is greater at the crown than the root, decreasing apically.
- The study analyzed tooth displacement and rotation during orthodontic treatment.
