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Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires
Published on: July 24, 2018
Perceived vs measured forces of interarch elastics.
Larry J Oesterle1, Justin M Owens2, Sheldon M Newman3
1Professor, chair, and program director, Department of Orthodontics, School of Dental Medicine, University of Colorado, Aurora, Colo.
Summary
Orthodontists show significant variation in prescribing latex elastic forces for Class II and Class III malocclusions. Elastics should be selected with higher initial forces due to decay during treatment.
Area of Science:
- Orthodontics
- Biomaterials Science
Background:
- Orthodontic treatment relies on clinical experience for optimal force prescription.
- Interarch latex elastics are crucial for correcting malocclusions.
Purpose of the Study:
- To survey practicing orthodontists regarding prescribed interarch latex elastic forces.
- To analyze force prescriptions across different malocclusion types and wire systems.
Main Methods:
- Thirty orthodontists evaluated four clinical scenarios (Class II/III, edgewise/light wires).
- Prescribed elastic sizes and locations were recorded.
- Measured forces were compared to actual forces using a testing machine.
Main Results:
- Significant variation in prescribed forces was observed across all scenarios.
- Mean forces ranged from 183g (Class II, light wires) to 290g (Class III, edgewise wires).
- Light wire forces were statistically lower than edgewise wire forces.
Conclusions:
- Considerable variability exists in orthodontists' elastic force prescriptions.
- Prescribed forces generally fell within one standard deviation of the mean, with exceptions.
- Higher initial elastic forces are recommended to compensate for decay during treatment.
