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Related Experiment Videos

Friction in perspective.

S Braun1, M Bluestein, B K Moore

  • 1Clinical Professor of Orthodontics, Vanderbilt University, Chicago, ILL, 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
|June 8, 1999
PubMed
Summary
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Dynamic oral movements significantly reduce orthodontic friction. Minute relative motions at the bracket/arch wire interface effectively minimize frictional resistance, challenging steady-state assumptions in orthodontic studies.

Area of Science:

  • Biomaterials Science
  • Orthodontics
  • Biomechanics

Background:

  • Traditional frictional resistance studies in orthodontics often use steady-state conditions, failing to replicate the dynamic oral environment.
  • Oral functions like chewing and swallowing create constant, small movements at the bracket/arch wire interface.
  • These dynamic forces influence normal forces, directly impacting frictional resistance.

Purpose of the Study:

  • To investigate the effect of dynamic oral environment simulation on frictional resistance in orthodontic appliances.
  • To determine if periodic, minute relative motions alter frictional resistance compared to static conditions.

Main Methods:

  • A pilot study simulated the dynamic conditions of the oral cavity.
  • Tested stainless steel arch wires and brackets commonly used in sliding mechanics.

Related Experiment Videos

  • Measured frictional resistance under simulated dynamic movements.

    • Main Results:

    • Frictional resistance was reduced to near zero during minute relative movements at the bracket/arch wire interfaces.
    • Factors including dental tipping, arch wire/slot clearance, and tying methods did not significantly affect dynamic frictional resistance.
    • The study highlights the ineffectiveness of static models for assessing orthodontic friction.

    Conclusions:

    • The dynamic nature of the oral environment drastically reduces orthodontic frictional resistance.
    • Static testing methods may overestimate friction, impacting treatment planning and appliance design.
    • Further research should incorporate dynamic simulations for more accurate orthodontic material assessment.