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Experimental force analysis of the contraction utility arch wire
American Journal of Orthodontics
|November 1, 1982
Summary
This study measured retraction forces on mandibular incisors using a contraction utility arch wire. Forces were optimal for tooth movement, but lateral incisors and narrow arch forms received higher forces.
Area of Science:
- Orthodontics
- Biomaterials Engineering
- Dental Mechanics
Background:
- Accurate measurement of orthodontic forces is crucial for effective treatment.
- Contraction utility arch wires are used for tooth retraction.
- Understanding force distribution is key to optimizing orthodontic outcomes.
Purpose of the Study:
- To measure the retraction force delivered by a specific contraction utility arch wire to mandibular incisors.
- To evaluate the force distribution across different incisor positions and arch forms.
Main Methods:
- An experimental apparatus with a metal framework, strain gauge, and Wheatstone bridge was employed.
- A 0.016 by 0.016 inch blue Elgiloy contraction utility arch wire was activated 1 mm.
- Retraction forces were recorded via oscilloscope deflection.
Main Results:
- Retraction forces were within an optimal range for rapid tooth movement with minimal adverse effects.
- Lateral incisor positions received significantly higher forces than central incisor positions.
- Narrow tapered arch forms delivered greater retraction force compared to ovoid arch forms.
Conclusions:
- The tested arch wire provides forces suitable for efficient orthodontic tooth movement.
- Force delivery varies significantly between central and lateral incisors.
- Arch form influences the magnitude of retraction force, with narrow tapered forms exerting more force.