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Related Experiment Video

Updated: Jun 15, 2026

Measuring the Complete-arch Distortion of an Optical Dental Impression
06:51

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Traditional Alginate Impressions vs Digital Optical Impressions Using Reverse-Engineering Technology: A Comparative

Manlio Santilli, Gianmaria D'addazio, Bruna Sinjari

    The International Journal of Prosthodontics
    |May 19, 2025
    PubMed
    Summary

    Digital impressions offer superior accuracy and precision compared to traditional alginate methods, even for inexperienced dental students. This study highlights the benefits of digital intraoral scanning for consistent clinical outcomes.

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    Area of Science:

    • Dental materials science
    • Digital dentistry
    • Biomedical engineering

    Background:

    • Traditional alginate impressions are prone to dimensional instability.
    • Digital intraoral scanning offers potential for improved accuracy and reproducibility.

    Purpose of the Study:

    • To compare the precision and accuracy of traditional alginate impressions versus digital optical impressions.
    • To evaluate these methods when performed by second-year dental students.

    Main Methods:

    • 128 impressions (64 alginate, 64 digital) were taken by 20 dental students.
    • Impressions were analyzed using reverse engineering software and compared to expert reference models.
    • 3D and point-by-point analyses assessed precision and accuracy.

    Main Results:

    • Digital impressions showed significantly smaller deviations from reference models.
    • Digital impressions demonstrated superior accuracy, precision, and trueness.
    • The null hypothesis of no significant difference was rejected (p < 0.05).

    Conclusions:

    • Digital impressions are more accurate and precise than alginate impressions, even with inexperienced operators.
    • Intraoral scanners enhance standardization and consistency in dental practice.
    • Integrating digital impression techniques in dental education improves proficiency and outcomes.