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Accuracy testing of three-dimensional digitizing systems.

E R Hewlett1, M E Orro, G T Clark

  • 1Dental Research Institute, University of California at Los Angeles.

Dental Materials : Official Publication of the Academy of Dental Materials
|January 1, 1992
PubMed
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This study developed a standard accuracy test for digital occlusal wear measurement devices. The test quantifies measurement error, revealing a linear relationship between surface slope and accuracy in microns.

Area of Science:

  • Biomaterials Science
  • Dental Technology
  • Metrology

Background:

  • Digital occlusal wear measurement devices require standardized accuracy testing.
  • Existing methods may not fully capture measurement errors related to surface topography.
  • The authors developed a novel device for digital occlusal wear assessment.

Purpose of the Study:

  • To establish a standard accuracy test for a self-designed digital occlusal wear measurement device.
  • To quantitatively determine the measurement error as a function of surface slope.
  • To assess the device's accuracy in microns.

Main Methods:

  • An accuracy test was applied to a custom-designed digital occlusal wear measurement device.
  • Trigonometric calculations determined Z-axis measurement error based on contact tip dimensions and a precision steel sphere.

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  • Point-by-point data correction was performed using calculated error values.

    • Main Results:

    • The accuracy test successfully quantified measurement error in microns.
    • A linear relationship was identified between the angle of surface slope and the measurement error.
    • Corrected data indicated the device's accuracy as a function of slope.

    Conclusions:

    • The developed accuracy test provides a quantitative measure of digital occlusal wear device performance.
    • The device exhibits a predictable error pattern related to surface inclination.
    • This standardized testing method is crucial for reliable occlusal wear assessment.