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[The lateral and transverse forces with indirect headgear and its modifications]
M Breier1, D Drescher, C Bourauel
1Poliklinik für Kieferorthopädie, Rheinische Friedrich-Wilhelms-Universität Bonn.
Fortschritte Der Kieferorthopadie
|April 1, 1993
Summary
Indirect headgear produces significant side effects, including unwanted transversal and lateral forces. This study used 3D sensors to measure these forces, revealing clinically relevant magnitudes and potential for minimizing adverse outcomes.
Area of Science:
- Orthodontics and Dental Biomechanics
- Craniofacial Growth and Development
Background:
- Indirect headgear is widely used in orthodontics, but its application generates unintended transversal and lateral forces.
- Clinical measurement of these forces is challenging, limiting understanding of their effects.
Purpose of the Study:
- To quantify the in vitro sagittal and transversal forces produced by various indirect headgear modifications.
- To assess the clinical relevance of these forces and explore methods for minimizing adverse effects.
Main Methods:
- Utilized 3D force sensors for precise in vitro measurement of forces generated by different headgear configurations.
- Analyzed both symmetrical and asymmetrical headgear designs.
Main Results:
- Transversal and lateral forces from indirect headgear reach clinically significant magnitudes.
- Symmetrical headgear produced expansive forces up to 20% of distal force.
- Expansion/compression headgear generated forces exceeding therapeutic limits.
- Asymmetric headgear produced lateral forces potentially causing scissor or cross bites.
Conclusions:
- Indirect headgear generates clinically relevant forces that can lead to undesirable outcomes.
- A method for minimizing lateral forces from asymmetric headgear was proposed.