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Related Experiment Videos

Thyroid function and root resorption

E Poumpros1, E Loberg, C Engström

  • 1UCLA.

The Angle Orthodontist
|January 1, 1994
PubMed
Summary

Thyroxine administration reduced force-induced root resorption in rats. This suggests thyroid hormone influences bone remodeling and may impact orthodontic treatment outcomes.

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Area of Science:

  • Endocrinology
  • Orthodontics
  • Periodontology

Background:

  • Bone remodeling, including resorption, is crucial in the periodontal region.
  • General bone modeling factors significantly influence degradative activities like phagocytosis and bone resorption.

Purpose of the Study:

  • To investigate the effect of thyroxine on force-induced root resorption.
  • To determine if thyroid hormone influences the process of orthodontic root resorption.

Main Methods:

  • Young male rats were divided into three groups: normal, control (appliances), and experimental (appliances + thyroxine).
  • Orthodontic force was applied to maxillary incisors to induce root resorption.
  • Alkaline phosphatase activity was measured.

Main Results:

  • Fewer force-induced root resorption lesions were observed in the thyroxine-administered group compared to the control group.
  • Alkaline phosphatase activity showed significant differences between the thyroxine group and both normal and control groups.

Conclusions:

  • Thyroxine administration appears to decrease the incidence of force-induced root resorption.
  • The observed reduction in resorptive lesions correlates with alterations in the bone modeling process, specifically affecting resorption activity.

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