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In situ Compressive Loading and Correlative Noninvasive Imaging of the Bone-periodontal Ligament-tooth Fibrous Joint
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Post-treatment changes in permanent retention.

Michael Wolf1,2, U Schulte3, K Küpper4

  • 1Department of Orthodontics, University of Bonn, Welschnonnenstrasse 17, 53111, Bonn, Germany. michael.wolf@uni-bonn.de.

Journal of Orofacial Orthopedics = Fortschritte Der Kieferorthopadie : Organ/Official Journal Deutsche Gesellschaft Fur Kieferorthopadie
|October 21, 2016
PubMed
Summary
This summary is machine-generated.

Permanent lingual retainers can cause unintended tooth movement, particularly in cases of intercanine expansion and excessive overjet correction. Identifying these risk factors is crucial for preventing post-orthodontic treatment changes.

Keywords:
Lingual retainerOrthodontic retentionPreventionTooth movementTwistflex retainer

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Area of Science:

  • Orthodontics
  • Dental Biomaterials

Background:

  • Permanent retention is standard for stabilizing orthodontic outcomes.
  • Recent studies indicate post-treatment tooth movement during permanent retention.

Purpose of the Study:

  • Analyze mandibular anterior tooth changes during permanent retention.
  • Determine if these changes follow a pattern.
  • Identify risk factors for unintended tooth movement.

Main Methods:

  • 30 patients with fixed Twistflex lingual retainers (canine to canine) were studied.
  • 3D virtual models from casts (T0, T1, T2) were analyzed.
  • Posttreatment changes (T2-T1) were compared to pretreatment (T0) and treatment (T1-T0) data.

Main Results:

  • Nearly all patients showed 3D tooth movement within the retainer.
  • Rotational movements in the labio-oral direction were common, centered at the incisors.
  • Intercanine expansion and excessive overjet correction were associated risk factors.

Conclusions:

  • Permanent lingual retainers are generally safe.
  • Specific clinical situations and risk factors (intercanine expansion, overjet correction) can lead to undesired tooth movement.
  • Additional retention may be necessary in certain cases.