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[Cervical headgear with angled outer arms. A biomechanically comprehensible system?]
M Breier1, C Bourauel, D Drescher
1Poliklinik für Kieferorthopädie, Universität zu Köln.
Fortschritte Der Kieferorthopadie
|May 1, 1995
Summary
The angulated face bow generates unintended forces and moments, challenging ideal rigid system assumptions. Outer bow deflection significantly impacts force components, especially with longer headgear, indicating a non-linear relationship.
Area of Science:
- Orthodontics
- Biomechanics
- Dental Materials
Background:
- The application of angulated face bows in orthodontics can lead to unintended vertical and transversal forces.
- Clinical analysis often assumes a rigid face bow system, simplifying moment calculations.
Purpose of the Study:
- To investigate the actual force components and moments generated by angulated face bows.
- To evaluate the validity of the rigid system assumption in clinical face bow analysis.
Main Methods:
- Experimental analysis of forces and turning moments during headgear use.
- Varying the length and angulation of the outer bow to assess its influence on force components.
Main Results:
- Angulated face bows generate unintended vertical and transversal forces alongside distalization moments.
- The assumption of a rigid face bow system does not fully represent reality.
- Deflection of the outer bow leads to a non-linear correlation between force and moment in the mesio-distal direction.
Conclusions:
- The geometric model of a rigid face bow is an oversimplification.
- Outer bow length critically influences the resulting forces and moments, with longer bows exhibiting more pronounced effects.
- Clinical force system analysis requires consideration of headgear deflection effects.