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Frictional forces when rectangular guiding arches with varying edge bevel are employed

H A Schumacher1, C Bourauel, D Drescher

  • 1Department of Orthodontics, University of Bonn, Germany.

Journal of Orofacial Orthopedics = Fortschritte Der Kieferorthopadie : Organ/Official Journal Deutsche Gesellschaft Fur Kieferorthopadie
|June 26, 1998
PubMed
Summary

Edge rounding on orthodontic wires reduces friction during canine retraction, improving sliding mechanics. Moderate rounding offers significant benefits without compromising leveling.

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Area of Science:

  • Orthodontic biomechanics
  • Dental materials science

Background:

  • Rectangular wires are standard for 3D tooth movement in orthodontics.
  • Edge-beveled wires aim to enhance sliding mechanics and patient comfort.
  • Friction significantly impacts the efficiency of orthodontic tooth movement.

Purpose of the Study:

  • To evaluate the effect of varying wire edge rounding on canine retraction friction.
  • To quantify the impact of wire design on sliding mechanics in orthodontics.

Main Methods:

  • Tested 0.016" x 0.022" steel wires (Remaloy, Remanium) in a 0.018" slot system.
  • Measured friction-induced force loss during canine retraction using the Orthodontic Measurement and Simulation System (OMSS).
  • Compared standard, moderately rounded, and sharply beveled wire configurations.

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Main Results:

  • Frictional force loss averaged approximately 50% during arch-guided canine distalization.
  • Rounded wires significantly reduced friction compared to sharp-edged wires.
  • Moderate rounding decreased frictional losses by about 10%; excessive beveling did not improve mechanics and risked leveling loss.

Conclusions:

  • Wire edge rounding is a critical factor in optimizing sliding mechanics during orthodontic canine retraction.
  • Moderate rounding effectively reduces friction, enhancing treatment efficiency.
  • Excessive edge beveling offers no additional benefit and may negatively impact leveling.