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Force decay of elastomeric chains - a mechanical design and product comparison study
David A Balhoff1, Matthew Shuldberg, Joseph L Hagan
1LSU Health Sciences Center, New Orleans, Louisiana, USA.
Journal of Orthodontics
|March 4, 2011
Summary
The 6-3 mechanical design demonstrated the least force decay in elastomeric chains for canine retraction. Ormco chains showed minimal force decay, while Unitek chains exhibited the highest, indicating design impacts efficiency.
Area of Science:
- Orthodontics
- Biomaterials Science
- Dental Mechanics
Background:
- Elastomeric chains are crucial for space closure in orthodontic treatment.
- Understanding force decay is essential for predicting treatment duration and efficacy.
- Different chain designs and manufacturers may influence mechanical properties.
Purpose of the Study:
- To compare the percentage force decay of three elastomeric chain designs during simulated canine retraction.
- To evaluate force decay differences among elastomeric chains from four distinct companies.
Main Methods:
- An in vitro laboratory study was conducted using closed, grey elastomeric chains.
- Three simulated space closure mechanisms (6-5-3, chain loop, 6-3) were tested using acrylic resin jigs.
- An electronic force gauge measured percentage force decay over 28 days.
Main Results:
- A statistically significant difference in mean percentage force decay was observed across the three mechanisms (P < 0.001).
- The 6-3 mechanical design exhibited the lowest mean percentage force decay for all companies.
- Significant differences in force decay were found among companies (P < 0.001), with Ormco showing the least and Unitek the most decay.
Conclusions:
- The 6-3 design is a more efficient mechanism for space closure using elastomeric chains due to lower force decay.
- Manufacturer variations significantly impact elastomeric chain force decay, influencing clinical performance.
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