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Related Experiment Videos

Orthodontic latex elastics: a force relaxation study.

Christiana Gioka1, Spiros Zinelis, Theodore Eliades

  • 1Department of Biomaterials, School of Dentistry, University of Athens, 2 Thivon Street Goudi, Athens, GR 11527, Greece.

The Angle Orthodontist
|April 28, 2006
PubMed
Summary

Latex elastics experience about 25% force relaxation within 24 hours, with most occurring in the first 3-5 hours. The extension needed varies significantly, from 2.7 to 5 times the original length.

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Area of Science:

  • Biomaterials Science
  • Orthodontic Materials

Background:

  • Latex elastics are crucial in orthodontics for applying controlled forces.
  • Understanding their force decay (relaxation) is essential for treatment efficacy.

Purpose of the Study:

  • To quantify the force relaxation of latex elastics over 24 hours.
  • To determine the extension required to achieve target forces.

Main Methods:

  • Five latex elastic specimens from different manufacturers were tested.
  • A custom setup monitored force levels in real-time over 24 hours.
  • Statistical analysis (ANOVA, Tukey test) was performed.

Main Results:

  • Latex elastics exhibited approximately 25% force relaxation within 24 hours.

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  • The majority of force relaxation occurred within the initial 3-5 hours.
  • Required elastic extension ranged from 2.7 to 5 times the original length.

    • Conclusions:

    • Latex elastic force significantly decreases within 24 hours, primarily in the first few hours.
    • The extension needed to achieve a specific force is highly variable.
    • These findings impact orthodontic treatment planning and appliance design.