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Angle Orthod. 2012 May;82(3):529-35. doi: 10.2319/062011-399.1. Epub 2011 Nov 11.

Influence of initial strain on the force decay of currently available elastic chains over time.

Author information

1
Orthodontic Department, University of Basel, Basel, Basel-Stadt, Switzerland.

Abstract

OBJECTIVE:

To investigate the dependence of force decay on the initial strain applied to currently available elastic chains.

MATERIALS AND METHODS:

Eight different elastic chains from eight major companies were tested for force decay over a period of 3 weeks at 50% and 100% strain. They were stored in water and thermocycled between 5°C and 55°C. An Instron 3344 was used for the force measurements.

RESULTS:

Absolute force values at 50% strain varied between 2.3 N and 4.1 N initially, and between 0.9 N and 1.6 N after 21 days. Thus, the force decay of the elastic chains varied from 37% to 75%. At 100% strain, the force values varied between 2.9 N and 4.7 N initially, and between 1.3 N and 2.1 N after 21 days of continuous strain. The force decay varied between 39% and 67%. Most force decays between 24 hours and 21 days were not significant. This information should be taken into consideration when the appropriate elastic chain is selected for clinical use.

CONCLUSION:

A wide array of elastic chains with various force levels is available. However, differences between products of greater than 100% were measured for force decay over time.

PMID:
22077188
DOI:
10.2319/062011-399.1
[Indexed for MEDLINE]

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