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A laboratory investigation of orthodontic elastomeric chains
British Journal of Orthodontics
|October 1, 1985
Summary
Orthodontic elastomeric chains exhibit non-linear force and extension characteristics. Optimal force for orthodontic treatment is achieved with 50-70% extension, providing consistent and predictable results.
Area of Science:
- Biomaterials Science
- Orthodontics
- Dental Materials
Background:
- Orthodontic elastomeric chains are widely used in dental treatments.
- Understanding their force-extension properties is crucial for effective treatment planning.
Purpose of the Study:
- To characterize the force and extension behavior of 13 commercial orthodontic elastomeric chain materials.
- To identify optimal extension percentages for predictable orthodontic forces.
Main Methods:
- Tested dimensions and force/extension characteristics of 13 orthodontic elastomeric chains.
- Analyzed force-extension curves, identifying non-linear relationships and transition points.
- Measured stiffness values for two-loop and four-loop configurations.
Main Results:
- Force and extension relationship was non-linear with two transition points.
- Stiffness decreased with increased loop count (two-loop: 0.9-1.6 N/mm; four-loop: 0.6-1.1 N/mm).
- 100% extension yielded forces in the 4-5 N range for most materials.
Conclusions:
- Orthodontic elastomeric chain behavior is complex and depends on extension.
- An extension range of 50-70% is recommended for optimal and consistent orthodontic force delivery.