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Updated: Mar 31, 2026

Measuring the Complete-arch Distortion of an Optical Dental Impression
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Analysis of Different Impression Techniques and Materials on Multiple Implants Through 3-Dimensional Laser Scanner.

Francesco Pera1, Paolo Pesce, Marco Bevilacqua

  • 1*Lecturer, Department of Fixed and Implant Prosthodontics (DISC), University of Genoa, Genoa, Italy. †Lecturer, Department of Fixed and Implant Prosthodontics (DISC), University of Genoa, Genoa, Italy. ‡Research Fellow, Department of Fixed and Implant Prosthodontics (DISC), University of Genoa, Genoa, Italy. §Assistant Professor, Department of Fixed and Implant Prosthodontics (DISC), University of Genoa, Genoa, Italy.

Implant Dentistry
|October 31, 2015
PubMed
Summary

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Stiff impression materials like plaster or rigid polyether are most accurate for full-arch implant impressions. Splinting impression copings did not enhance accuracy in this study.

Area of Science:

  • Dental prosthetics
  • Biomaterials science
  • Clinical dentistry

Background:

  • Accurate impressions are crucial for fabricating well-fitting full-arch implant prostheses.
  • Various impression techniques and materials exist, each with potential impacts on accuracy.
  • Evaluating these techniques is essential for optimizing clinical outcomes in implant dentistry.

Purpose of the Study:

  • To compare the accuracy of seven distinct impression techniques for full-arch implant restorations.
  • To determine which impression materials and methods yield the most precise results.

Main Methods:

  • Seven impression techniques were evaluated on a master cast with four implants.
  • Techniques included open and closed tray methods with polyether (Impregum, Ramitec) and impression plaster.

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  • A 3D laser scanner measured deviations from the master cast for 35 realized casts.

    • Main Results:

    • Open tray impression with Impregum (OTI) and splinted open tray impression with Impregum (OTSI) showed statistically significant differences.
    • Impression plaster (OTP) and closed tray with Ramitec (CTR) exhibited minimal deviations, close to zero.
    • Splinting impression copings did not significantly improve accuracy across techniques.

    Conclusions:

    • Rigid impression materials, such as impression plaster and stiff polyether, provide superior accuracy for multiple implant impressions in full-arch rehabilitations.
    • The accuracy of impression techniques for full-arch implant prostheses is material-dependent.
    • Splinting impression copings is not a beneficial factor for enhancing impression accuracy.