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Related Experiment Video

Updated: Jun 30, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

Strain development in 3-unit implant-supported CAD/CAM restorations.

Matthias Karl1, Manfred G Wichmann, Siegfried M Heckmann

  • 1Department of Prosthodontics, University of Erlangen-Nuremberg, Erlangen, Germany. karl_matthias@web.de

The International Journal of Oral & Maxillofacial Implants
|September 24, 2008
PubMed
Summary

Computer-generated fixed partial dentures (FPDs) using optical impressions show reduced strain development compared to conventional methods. This indicates a passive fit comparable to traditional techniques, improving implant-supported restorations.

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Area of Science:

  • Dental prosthetics
  • Biomaterials engineering
  • Digital dentistry

Background:

  • Achieving passive fit in implant-supported restorations is challenging with current fabrication methods.
  • Strain development during superstructure fabrication can compromise restoration longevity and implant stability.

Purpose of the Study:

  • To compare strain development in computer-aided design/computer-aided manufacturing (CAD/CAM) fixed partial dentures (FPDs) fabricated from optical impressions versus conventionally fabricated FPDs.
  • To evaluate the passive fit of CAD/CAM-generated FPDs in implant-supported restorations.

Main Methods:

  • A measurement model with two implants was used, with strain gauges placed mesially and distally.
  • Three groups of FPDs were fabricated: conventional (repositioning impression), conventional (pick-up impression), and CAD/CAM (optical impression).

Related Experiment Videos

Last Updated: Jun 30, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

  • Strain development during FPD fixation was recorded and analyzed using multivariate analysis of variance (MANOVA).

    • Main Results:

    • CAD/CAM-fabricated FPDs exhibited significantly lower strain development compared to those made from pick-up impressions (P = .01).
    • No significant difference in strain development was found between CAD/CAM FPDs and those made from repositioning impressions (P = .19).
    • Conventionally fabricated FPDs showed no significant difference in strain development between the two impression techniques (P = .07).

    Conclusions:

    • Restorations fabricated using optical impressions achieve a passive fit comparable to conventional methods.
    • CAD/CAM technology offers a promising approach to minimize strain in implant-supported FPDs.
    • This study supports the use of optical impressions for fabricating passive-fitting implant restorations.