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Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
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Quantitative evaluation of implemented interproximal enamel reduction during aligner therapy.

Zamira Kalemaj, Luca Levrini

    The Angle Orthodontist
    |December 18, 2020
    PubMed
    Summary

    Implemented interproximal reduction (IPR) often falls short of programmed IPR, particularly on lower canines. Using burs and measuring gauges can enhance IPR accuracy in aligner therapy.

    Keywords:
    AlignersEnamel reductionInterproximal enamel reductionInterproximal reductionInvisalignStripping

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    Area of Science:

    • Orthodontics
    • Dental Materials Science

    Background:

    • Interproximal reduction (IPR) is crucial for orthodontic tooth movement.
    • Accurate IPR is essential for predictable treatment outcomes in aligner therapy.

    Purpose of the Study:

    • To evaluate the correlation between planned (programmed) and actual (implemented) IPR in orthodontic aligner treatment.
    • To identify factors influencing the precision of implemented IPR for improved efficiency.

    Main Methods:

    • A prospective observational study included 50 patients undergoing aligner therapy with six orthodontists.
    • Data on programmed IPR, implemented IPR, and technical aspects were collected for 464 teeth.
    • Statistical analyses included Wilcoxon signed-rank test, Kruskal-Wallis, and multilevel mixed regression.

    Main Results:

    • A statistically significant mean difference of 0.15 mm was found between programmed and implemented IPR (P = .0001).
    • Lower canines and distal tooth surfaces exhibited the greatest discrepancies.
    • The use of burs and measuring gauges, along with pre-IPR tooth alignment, improved IPR precision.

    Conclusions:

    • Implemented IPR is frequently less than programmed IPR, necessitating careful execution.
    • Specific techniques, such as using burs and measuring gauges, can enhance IPR accuracy.
    • Attention to procedural details is vital for maximizing the precision of implemented IPR in clinical practice.