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Related Experiment Videos

Force decay of elastomeric chain--a serial study. Part II

T C Lu1, W N Wang, T H Tarng

  • 1Department of Dentistry, Tri-Service General Hospital, Taipei, Taiwan, Republic of China.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|October 1, 1993
PubMed
Summary

This study evaluated elastomeric chain force decay over six weeks. Clear chains and longer stretches (40mm) retained more force, crucial for orthodontic tooth movement.

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Area of Science:

  • Orthodontics
  • Biomaterials Science

Background:

  • Elastomeric chains are vital in orthodontics for applying continuous force.
  • Understanding force decay is essential for effective treatment planning and predicting tooth movement.

Purpose of the Study:

  • To evaluate the force decay of elastomeric chains over six weeks.
  • To compare force decay curves based on different initial stretched lengths (30mm, 35mm, 40mm).
  • To compare the force decay between transparent and grey elastomeric chains from different manufacturers.

Main Methods:

  • Elastomeric chains were submerged in a 37°C water bath for six weeks.
  • Elastic forces were measured using a dynamometer at various time points.
  • Chains were stretched to different lengths and force decay was recorded over time.

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Main Results:

  • Longer initial stretches (40mm) of Rocky Mountain clear chains showed higher initial force but lower percentage of remaining force compared to shorter stretches.
  • American Orthodontic transparent chains demonstrated superior force retention compared to grey chains.
  • Rocky Mountain clear chains with 40mm stretch outperformed American Orthodontic chains in force retention.

Conclusions:

  • The effective force for canine retraction can be maintained for varying durations depending on the elastomeric chain type and stretch length.
  • Rocky Mountain clear chains, particularly at 40mm stretch, offer prolonged effective force for orthodontic applications.