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Related Experiment Videos

[Clinical experiences with the torque-segmented arch (TSA)]

F G Sander1, A Wichelhaus

  • 1Abteilung Kieferorthopädie, Universität Ulm.

Fortschritte Der Kieferorthopadie
|July 1, 1995
PubMed
Summary
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This study introduces a novel torque segmented archwire for orthodontic treatment, demonstrating effective torque transfer with customizable adaptation for individual patient needs and various orthodontic techniques.

Area of Science:

  • Orthodontics
  • Biomaterials Engineering

Background:

  • Traditional orthodontic archwires often face challenges with torque control and patient-specific adaptation.
  • The development of advanced materials and designs is crucial for improving treatment efficiency and outcomes.

Observation:

  • The torque segmented archwire utilizes a combination of pseudoelastic material for anterior teeth and a steel portion for lateral teeth.
  • This design allows for individual adaptation of the anterior component and precise bending of the lateral components (first, second, and third order bends).
  • Available superelastic material dimensions (0.016 x 0.022, 0.017 x 0.025, 0.018 x 0.025) offer selectable torque options of 30 or 45 degrees.

Findings:

  • The torque segmented archwire achieved good torque transfer across all patients, with an average monthly torque change of 2.34 degrees (range: 1 to 5.5 degrees).

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  • This archwire system demonstrated problem-free adaptation to individual patient situations.
  • It is compatible with both standard edgewise and straight wire orthodontic techniques.

    • Implications:

    • Practitioners gain greater control over torque loss and incisor axial positioning, reducing reliance on traditional methods.
    • The archwire's design facilitates continuous monitoring and adjustment of transferred torque relative to the occlusal plane using a torque key.
    • This innovative archwire is suitable for segmented archwire techniques and effective for anterior retraction, offering versatility in orthodontic applications.