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Ceramic bracket design: an analysis using the finite element method

J Ghosh1, R S Nanda, M G Duncanson

  • 1University of Oklahoma, Department of Orthodontics, Oklahoma City, USA.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|December 1, 1995
PubMed
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Finite element analysis revealed that ceramic orthodontic bracket design significantly impacts stress distribution. Brackets with features like an isthmus and rounded edges better withstand forces from arch wires, reducing fracture risk.

Area of Science:

  • Orthodontics
  • Biomaterials Science
  • Mechanical Engineering

Background:

  • Ceramic brackets offer aesthetic advantages over traditional metal brackets.
  • Understanding stress distribution in ceramic brackets is crucial for preventing failure.
  • Previous studies have not fully explored the impact of specific design features on ceramic bracket stress tolerance.

Purpose of the Study:

  • To create finite element models of ceramic orthodontic brackets.
  • To analyze stress distribution under simulated arch wire torsion and tipping forces.
  • To evaluate how bracket design influences stress tolerance and identify optimal designs.

Main Methods:

  • Developed 3D finite element models of six commercial ceramic brackets (one monocrystalline, five polycrystalline alumina).

Related Experiment Videos

  • Applied simulated arch wire forces (torsion and tipping) to the models.
  • Recorded and analyzed stress levels at critical points within the brackets.

    • Main Results:

    • High stress concentrations were observed at abrupt geometric changes.
    • Contour and Allure brackets showed good stress distribution due to slot/wing design.
    • Brackets with an isthmus generally resisted stress better than those without.
    • Starfire bracket exhibited high, irregular stress due to sharp angles and lack of an isthmus.

    Conclusions:

    • Finite element analysis is a valuable tool for assessing ceramic bracket stress.
    • Bracket design, including features like an isthmus and rounded edges, is critical for stress management.
    • Specific designs (Contour, Allure, Transcend, Lumina) demonstrate superior stress distribution compared to others (Starfire).