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Direct versus indirect loading of orthodontic miniscrew implants-an FEM analysis.
C Holberg1, P Winterhalder, N Holberg
1Department of Orthodontics, University of Munich, Goethestrasse 70, 80336, Munich, Germany, cholberg@med.uni-muenchen.de.
Clinical Oral Investigations
|November 1, 2012
Summary
Indirect miniscrew anchorage reduces bone loading and risk of implant loss compared to direct anchorage. Integrating more teeth into the anchorage block enhances this protective effect, crucial for demanding orthodontic cases.
Area of Science:
- Orthodontics
- Biomaterials Engineering
- Dental Implantology
Background:
- Mesializing lower molars presents significant orthodontic anchorage challenges.
- Miniscrew implants offer effective anchorage, utilized either directly or indirectly.
- Understanding biomechanical differences is key to optimizing miniscrew stability.
Purpose of the Study:
- To analyze biomechanical differences between direct and indirect miniscrew anchorage.
- To evaluate the impact of these anchorage types on miniscrew implant primary stability.
Main Methods:
- Utilized CAD-CAM models from patient CT data.
- Generated four 3D FEM models incorporating miniscrews, brackets, and arches.
- Defined material properties, boundary conditions, and force parameters for simulations.
Main Results:
- Direct anchorage resulted in greater compact bone loading near the miniscrew.
- Indirect anchorage showed reduced peri-implant bone loading.
- Increased integration of anchor teeth in indirect anchorage further decreased bone loading.
Conclusions:
- Indirect miniscrew anchorage is a reliable method to reduce peri-implant bone stress and miniscrew loss risk.
- Integrating more teeth into the anchorage block amplifies the protective benefits of indirect anchorage.
- Indirect anchorage is recommended for clinical situations demanding substantial orthodontic forces to minimize miniscrew failure.
