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Recommendations for clear aligner therapy using digital or plaster study casts.

Hsiu-Ching Ko1, Weitao Liu2, Derek Hou2

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Digital versus plaster models did not impact clear aligner treatment recommendations. Orthodontists were less likely to recommend clear aligners for extraction or surgical cases.

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Area of Science:

  • Orthodontics
  • Dental Technology

Background:

  • Clear aligner therapy has advanced significantly over two decades.
  • Clinician experience with aligners has grown, but knowledge gaps exist regarding treatable malocclusions.
  • The impact of digital versus plaster models on aligner treatment planning remains unclear.

Purpose of the Study:

  • To determine the types of malocclusions recommended for clear aligner treatment.
  • To investigate if digital or plaster models influence treatment planning decisions for clear aligners.

Main Methods:

  • Sixteen orthodontists evaluated 20 cases at two time points, using either digital or plaster models.
  • Participants decided on Invisalign® candidacy and provided reasons for exclusion.
  • Statistical analysis included generalized estimating equations regression and logistic regression models.

Main Results:

  • No significant difference in Invisalign® recommendations was observed between digital and plaster model groups.
  • No significant difference in agreement rates was found between groups using the same versus different model formats.
  • Clear aligner recommendations were significantly lower for cases requiring extractions (15%) or surgery (29%) compared to those without.

Conclusions:

  • Digital and plaster models do not influence orthodontists' decisions regarding clear aligner recommendations.
  • Orthodontists in this study were less inclined to recommend clear aligners for complex cases, including those needing extractions or surgery.