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2019 Annual Session Conference

One Couple and Two Couple Appliances: Controlling Side-Effects

May 4, 2019 10:55am ‐ May 4, 2019 11:25am


Conventional orthodontic appliances consisting of brackets and wires lend themselves to creative designs that can be tailored to produce desired tooth movements. It is still early in the evolution of aligner treatment so it may be more difficult at this point to avoid biomechanical side-effects. This presentation will compare one couple and two couple mechanical force systems and show examples of situations where it may be beneficial to implement one over the other. Examples of unfavorable mechanical strategies in conventional and aligner treatment will also be discussed.

Learning Objectives:

  • Use one couple and two couple mechanical strategies successfully in orthodontic treatment.
  • Recognize unfavorable tooth positions that can cause unwanted side effects unless preventive strategies are undertaken.
  • Avoid and correct unwanted side-effects that occur due to commonly-encountered geometric relationships between teeth.


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