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Related Experiment Videos

[Enamel damage depending on the method of bracket removal]

H Fischer-Brandies1, L Kremers, C Reicheneder

  • 1Klinik für Kieferorthopädie, Christian-Albrechts-Universität, Kiel.

Fortschritte Der Kieferorthopadie
|April 1, 1993
PubMed
Summary

Bracket removal methods significantly impact enamel damage. Torsion causes deeper, more extensive lesions, while bending results in fewer, superficial enamel defects, highlighting clinical relevance.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Orthodontic Research

Background:

  • Orthodontic treatment involves bracket placement and removal.
  • Bracket removal can cause iatrogenic damage to tooth enamel.
  • Understanding the mechanisms of enamel damage is crucial for minimizing harm.

Purpose of the Study:

  • To compare enamel lesions resulting from two bracket removal methods: torsion and bending.
  • To analyze the characteristics and extent of enamel damage caused by each removal technique.

Main Methods:

  • Extracted human molars (n=19 per group) with metal brackets attached using the concise etching technique were used.
  • Bracket removal was performed using a standardized testing machine with modified torsion and bending mechanisms.

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  • Enamel surfaces were analyzed using scanning electron microscopy.

    • Main Results:

    • Torsion method resulted in enamel lesions covering 48.3% of the adhesive-free surface, often reaching deeper enamel layers.
    • Bending method produced less frequent, primarily superficial enamel lesions, concentrated in pressure zones.
    • Mechanical models confirmed stress distribution correlating with observed enamel lesions.

    Conclusions:

    • The method employed for bracket removal is clinically significant concerning the degree of enamel damage.
    • Bending appears to be a less destructive method for bracket removal compared to torsion.
    • Minimizing enamel damage during bracket removal is essential for patient outcomes.