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A new concept: impulse in orthodontics
1Vanderbilt University Medical Center and University of Illinois at Chicago, USA.
Summary
Extraoral appliances can effectively balance forces from intraoral appliances like space closure springs. Proper force and timing ensure anchorage preservation, even with part-time wear.
Area of Science:
- Orthodontics
- Biomechanical Engineering
Background:
- Intraoral appliances, such as space closure springs, exert continuous forces on teeth.
- Extraoral appliances are often used intermittently to counteract these forces and preserve anchorage.
Purpose of the Study:
- To provide a rational explanation for the effectiveness of part-time extraoral appliance wear in balancing intraoral forces.
- To establish a theoretical basis for achieving anchorage control in three dimensions.
Main Methods:
- Equating the impulse (force x time or moment x time) of extraoral appliances to that of intraoral appliances.
- Analyzing the role of force magnitude and application timing in energy transfer to anchorage teeth.
Main Results:
- Clinical evidence suggests part-time extraoral appliance wear can suffice for anchorage control.
- The impulse-based approach provides a framework for understanding and achieving desired anchorage outcomes.
Conclusions:
- Clinicians can achieve adequate anchorage by carefully adjusting the force/moment magnitude and application time of extraoral appliances.
- This approach allows for precise control of energy levels for three-dimensional anchorage.