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Factors affecting tooth movement in sliding mechanics
1Department of Dental Materials Science, UMDS, London.
European Journal of Orthodontics
|June 1, 1993
Summary
This study analyzes forces in orthodontic sliding mechanics, revealing bracket binding causes. Findings show forces depend on wire rigidity, bracket dimensions, and position, impacting treatment outcomes.
Area of Science:
- Orthodontics
- Biomechanical Engineering
- Dental Mechanics
Background:
- Sliding mechanics are crucial in orthodontics for tooth movement.
- Understanding forces between brackets and wires is key to preventing binding and optimizing treatment.
- Existing models may not fully capture the complex force dynamics involved.
Purpose of the Study:
- To analytically investigate the force system between orthodontic brackets and wires during sliding mechanics.
- To elucidate the causes of bracket binding using simple beam theory.
- To provide experimental validation for the theoretical findings.
Main Methods:
- Analytical examination using simple beam theory.
- Experimental validation on an enlarged model system.
- Parametric analysis of force system variables.
Main Results:
- The restoring couple is influenced by wire flexural rigidity (EI), bracket width, span length, and bracket position.
- Bracket binding is shown to be a function of these geometric and material properties.
- A net vertical force arises during tipping, initially intrusive and becoming extrusive during retraction.
Conclusions:
- The analytical model accurately predicts forces in sliding mechanics, validated by experiments.
- Bracket position significantly affects the force system, offering insights into binding.
- Understanding these force dynamics can refine orthodontic treatment planning and appliance design.