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Arch expansion with the Invisalign system: Efficacy and predictability.

Ignacio Morales-Burruezo1, José-Luis Gandía-Franco2, Juan Cobo3

  • 1Orthodontics Teaching Unit, Department of Stomatology, Faculty of Medicine and Dentistry, University of Valencia, Valencia, Spain.

Plos One
|December 10, 2020
PubMed
Summary
This summary is machine-generated.

The updated Invisalign SmartTrack system effectively expands arches, though planned expansion often exceeds actual results. Overcorrection during virtual planning is recommended for optimal outcomes in orthodontic treatment.

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Area of Science:

  • Orthodontics
  • Dental Materials Science

Background:

  • Skeletal crossbite in adults necessitates combined surgical and orthodontic treatment.
  • Dentoalveolar crossbite can be treated with fixed or removable appliances, including clear aligners.
  • Previous studies on Invisalign predictability used older appliances; this study evaluates the updated SmartTrack system.

Purpose of the Study:

  • To assess the predictability of arch expansion using the Invisalign SmartTrack system.
  • To compare planned expansion measurements with actual outcomes in patients with transverse malocclusion.

Main Methods:

  • 114 patients with transverse malocclusion were treated with SmartTrack aligners.
  • Clincheck software predictions were compared to actual measurements of canine, premolar, and molar widths, rotations, and inclinations.
  • Three data sets were analyzed: initial (T1), predicted (T2), and post-treatment (T3).

Main Results:

  • Significant arch width increases were observed across all measured teeth.
  • Planned expansion consistently overestimated actual expansion, particularly for canines and premolars.
  • The system's predictions were significantly higher than actual outcomes, except for the second molar.

Conclusions:

  • Clear aligners, including SmartTrack, are effective for arch expansion, with greater efficacy in the premolar region.
  • The predictability of expansion movement is reasonable, but overcorrection in virtual planning is advised.
  • Clincheck software predictions require adjustment for optimal treatment outcomes.