Study Examines Predictability of Transverse Expansion in Clear Aligner Therapy
Researchers investigated whether posterior tooth length and crown-root ratios affect transverse expansion efficiency in clear aligner therapy, finding that actual expansion often falls short of digital plans.
Key points
- Achieved expansion in clear aligner therapy was significantly lower than planned digital models.
- Posterior tooth length and crown-root ratios showed no significant link to expansion efficiency.
- Researchers evaluated 25 patients undergoing Invisalign treatment involving transverse expansion.
A new retrospective study published in Scientific Reports by researchers at Mersin University's Faculty of Dentistry investigated the factors influencing transverse expansion efficiency in clear aligner therapy (CAT). Evaluating 25 patients treated with Invisalign, the research team compared planned dental expansion from digital treatment setups with actual results measured on digital models. The findings indicate that achieved expansion values were significantly lower across all evaluated dental regions compared to what was initially planned, with overall expansion efficiency ranging between 80.03% and 91.08%.
The study specifically analyzed whether dental panoramic radiograph-derived posterior tooth length and crown-root ratios could serve as reliable predictors for expansion outcomes. However, correlation and multivariable regression analyses revealed no significant associations between these morphological variables and expansion efficiency. This suggests that other clinical factors beyond basic tooth length and crown-root proportions play a primary role in determining how well teeth respond to transverse movement using clear aligners.
What to know: While clear aligner therapy is widely used for dental realignment, patients should discuss realistic treatment expectations and potential discrepancies between digital simulations and clinical outcomes with an orthodontist.
Readers considering orthodontic treatments should consult a qualified dental professional for personalized medical advice and tailored treatment planning.
Source Nature Health Sciences — nature.com/articles/s41598-026-80429-w ↗
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