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Related Experiment Video

Updated: Mar 9, 2026

Measuring the Complete-arch Distortion of an Optical Dental Impression
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Digital vs. conventional full-arch implant impressions: a comparative study.

Sarah Amin1, Hans Peter Weber1, Matthew Finkelman2

  • 1Division of Postgraduate Prosthodontics, Tufts University School of Dental Medicine, Boston, MA, USA.

Clinical Oral Implants Research
|January 1, 2017
PubMed
Summary

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Digital full-arch implant impressions using the True Definition scanner and CEREC Omnicam demonstrated superior accuracy compared to conventional methods. The True Definition scanner yielded significantly fewer deviations, offering enhanced precision in dental restorations.

Area of Science:

  • Digital Dentistry
  • Implantology
  • Prosthodontics

Background:

  • Accurate full-arch impressions are crucial for successful implant-supported prostheses.
  • Conventional impression techniques can be time-consuming and prone to inaccuracies.
  • Digital intraoral scanners offer a potential alternative for capturing full-arch implant data.

Purpose of the Study:

  • To compare the accuracy of digital full-arch implant impressions using CEREC Omnicam and True Definition scanners against conventional splinted open-tray impressions.
  • To evaluate the hypothesis that conventional impressions would be more accurate than digital ones.

Main Methods:

  • A master cast of an edentulous mandible with five strategically angled implant analogs was created.
  • Conventional impressions (n=10) were made using a splinted open-tray technique with polyether material.
Keywords:
dental implantsdigital dentistrydigital implant impressionsedentulousfull-arch implant impressions

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  • Digital impressions (n=10 per scanner) were captured using CEREC Omnicam and 3M True Definition scanners with scan bodies. All casts were digitized, and STL files were analyzed for 3D deviations (root-mean-square error) against the master cast.

    • Main Results:

    • Conventional impressions (Group I) showed a mean deviation of 167.93 μm.
    • CEREC Omnicam (Group II) digital impressions had a mean deviation of 46.41 μm.
    • True Definition (Group III) digital impressions exhibited the lowest mean deviation at 19.32 μm. All groups showed statistically significant differences (P < 0.001).

    Conclusions:

    • Digital full-arch implant impressions using both True Definition and Omnicam scanners are significantly more accurate than conventional splinted open-tray impressions.
    • The True Definition scanner demonstrated significantly higher accuracy with fewer 3D deviations compared to the Omnicam scanner.
    • Digital impression techniques, particularly with the True Definition scanner, represent an advancement in achieving precise full-arch implant restorations.