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Force Systems Produced by Different Cantilever Configurations during Deactivation
Malgorzata Bilinska1, Isabel Meret Golliez2, Michel Dalstra1
1Section of Orthodontics, Department of Dentistry and Oral Health, Aarhus University, Vennelyst Boulevard 9, 8000 Aarhus, Denmark.
Materials (Basel, Switzerland)
|July 27, 2022
Summary
Orthodontic intrusion arches generate different force systems based on cantilever design. Arch-formed designs provide intrusive forces, while straight designs yield extrusive forces, influencing treatment outcomes.
Area of Science:
- Orthodontics
- Biomechanical Engineering
- Dental Mechanics
Background:
- Three-piece orthodontic arches are standard for achieving tooth intrusion.
- Understanding cantilever design's impact on force systems is crucial for effective orthodontic treatment.
Purpose of the Study:
- To experimentally evaluate how different cantilever designs of three-piece intrusion arches influence the generated force systems.
- To compare the biomechanical effects of straight versus arch-formed cantilever designs.
Main Methods:
- Simulated three-piece intrusion arches with various cantilever designs (tip-back, flat curve, deep curve, utility arches) were activated.
- A hexapod system measured the generated force systems.
- Typodonts were scanned pre- and post-experiment, and data were analyzed using specialized software.
Main Results:
- Arch-formed designs (deep curve, flat curve) produced intrusive vertical forces, while straight designs generated extrusive forces.
- Deep curve and tip-back designs resulted in retrusive sagittal forces, whereas the 6 mm utility arch produced a protrusive force.
- Deep curve and tip-back designs generated medial forces, and the 6 mm utility arch produced a lateral force.
- Straight designs exhibited higher overall force levels compared to arch-formed designs.
Conclusions:
- Cantilever design significantly alters the force system generated by three-piece intrusion arches.
- Deep curve or tip-back configurations are suitable for intrusion with retraction.
- A 6 mm utility arch configuration is indicated for intrusion with protrusion.
- Treatment planning should consider specific cantilever designs to achieve desired tooth movement.
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