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[How precise is the optical Cerec impression?].

C Benz1, P Schwarz

  • 1Poliklinik für Zahnerhaltung und Parodontologie der Universität München.

Deutsche Zahnarztliche Zeitschrift
|September 1, 1991
PubMed
Summary
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The Cerec device offers precise optical impressions, with surface averages accurate to within 5 microns. However, accuracy may decrease in areas parallel to the measurement direction.

Area of Science:

  • Dental Technology
  • Biomedical Engineering
  • Optical Metrology

Context:

  • The Cerec device is a CAD/CAM system used for digital dental impressions.
  • Accurate digital impressions are crucial for fabricating dental restorations.
  • Evaluating the precision of optical impression systems is essential for clinical application.

Purpose:

  • To assess the accuracy and reliability of optical impressions generated by the Cerec device.
  • To quantify the precision of z-data and surface measurements obtained from the Cerec system.
  • To identify potential sources of error or deviation in Cerec optical impressions.

Summary:

  • The Cerec device demonstrates a perfect linear correlation (r=1) between z-data and altitude, with each bit representing 49 microns.

Related Experiment Videos

  • Repeated measurements show pixel-z-data precision within +/- 49 microns.
  • Surface averages across 484 pixels achieve a precision of +/- 5 microns.
  • Deviations in precision are observed in areas parallel to the direction of measurement.

    • Impact:

    • Provides quantitative data on the precision of Cerec optical impression technology.
    • Informs dentists and dental technicians about the system's capabilities and limitations.
    • Contributes to the understanding of digital impression accuracy in restorative dentistry.
    • Highlights areas for potential improvement in optical scanning technology.