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Related Experiment Videos

Friction does not increase anchorage loading.

Thomas E Southard1, Steve D Marshall, Nicole M Grosland

  • 1Department of Orthodontics, University of Iowa, Iowa City, Iowa 52246, USA. tom-southard@uiowa.edu

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|March 10, 2007
PubMed
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Orthodontic sliding mechanics do not require extra force to overcome friction. Reduced-friction brackets are unnecessary for preventing anchorage loss, challenging conventional beliefs in canine retraction.

Area of Science:

  • Orthodontics
  • Biomechanics
  • Dental Materials

Background:

  • Conventional orthodontic wisdom posits that increased force is needed to overcome friction during canine retraction (sliding mechanics).
  • This is believed to result in higher anchorage loading and potential anchorage loss.
  • The biomechanical implications of this friction on both canine retraction and molar protraction are often debated.

Purpose of the Study:

  • To re-evaluate the biomechanical principles of friction during canine retraction in orthodontics.
  • To determine if reduced-friction brackets are necessary to mitigate anchorage loading.
  • To challenge the conventional understanding of force application in sliding mechanics.

Main Methods:

  • Theoretical biomechanical analysis of forces during canine retraction.

Related Experiment Videos

  • Examination of the interaction between archwire, canine bracket, and anchor molar.
  • Evaluation of the principles of action-reaction in orthodontic mechanics.

    • Main Results:

    • Frictional force during canine retraction exerts an equal and opposite force on the anchor molar.
    • The retarding force on the canine is matched by a protracting force on the molar due to friction.
    • The premise that additional force is required to overcome friction is biomechanically flawed.

    Conclusions:

    • Emphasis on reduced-friction brackets for sliding mechanics is not supported by biomechanical principles.
    • Posterior anchorage loading is not inherently increased by friction in a way that necessitates special brackets.
    • The biomechanics of canine retraction suggest friction's effect is self-balancing, not an impediment requiring special solutions.