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Related Experiment Videos

Frictional forces in fixed appliances.

D C Tidy1

  • 1Dundee Dental Hospital.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|September 1, 1989
PubMed
Summary
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Frictional resistance during orthodontic tooth movement increases with load and decreases with bracket width. Nitinol and beta-titanium arch wires generated significantly higher friction than stainless steel wires.

Area of Science:

  • Orthodontics
  • Biomaterials Science
  • Dental Mechanics

Background:

  • Understanding friction is crucial for efficient orthodontic treatment.
  • Friction between brackets and arch wires influences the speed and predictability of tooth movement.
  • Previous studies have explored various factors affecting orthodontic friction.

Purpose of the Study:

  • To quantify frictional resistance during simulated bodily tooth movement along a continuous arch wire.
  • To investigate the impact of applied load, bracket width, slot size, arch wire dimensions, and material on friction.
  • To compare the frictional characteristics of different arch wire materials, including Nitinol, beta-titanium (TMA), and stainless steel.

Main Methods:

  • An in vitro fixed appliance was designed to mimic orthodontic tooth movement.

Related Experiment Videos

  • Systematic variations in load, bracket width, slot size, arch wire size, and material were applied.
  • Frictional forces were measured under controlled laboratory conditions.

    • Main Results:

    • Frictional resistance was found to be directly proportional to the applied load.
    • Friction decreased as bracket width increased.
    • Arch wire dimensions and bracket slot size demonstrated minimal influence on frictional forces.
    • Nitinol and beta-titanium arch wires exhibited 2x and 5x greater frictional forces, respectively, compared to stainless steel.

    Conclusions:

    • Bracket width and applied load are significant determinants of friction in orthodontic tooth movement.
    • The choice of arch wire material substantially impacts frictional resistance, with Nitinol and beta-titanium posing higher friction challenges than stainless steel.
    • These findings have implications for optimizing appliance design and material selection in orthodontics to enhance treatment efficiency.