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Related Concept Videos

Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.
Instrument Calibration01:12

Instrument Calibration

Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...
Accuracy and Precision01:52

Accuracy and Precision

Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.  Highly accurate measurements...
Uncertainty in Measurement: Reading Instruments02:46

Uncertainty in Measurement: Reading Instruments

Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...
Random and Systematic Errors01:20

Random and Systematic Errors

Scientists always try their best to record measurements with the utmost accuracy and precision. However, sometimes errors do occur. These errors can be random or systematic. Random errors are observed due to the inconsistency or fluctuation in the measurement process, or variations in the quantity itself that is being measured. Such errors fluctuate from being greater than or less than the true value in repeated measurements. Consider a scientist measuring the length of an earthworm using a...

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Related Experiment Video

Updated: May 25, 2026

Measurement of Carotenoids in Perifovea using the Macular Pigment Reflectometer
09:35

Measurement of Carotenoids in Perifovea using the Macular Pigment Reflectometer

Published on: January 29, 2020

Repeatability of color-measuring devices.

Karl Martin Lehmann1, Alessandro Devigus, Christopher Igiel

  • 1Department of Prosthetic Dentistry, University Medical Center, Mainz, Germany. karl.lehmann@unimedizin-mainz.de

The European Journal of Esthetic Dentistry : Official Journal of the European Academy of Esthetic Dentistry
|January 13, 2012
PubMed
Summary
This summary is machine-generated.

Dental shade measurements show high repeatability within the same device but vary significantly between different devices. This means results from different color-measuring instruments are not comparable for accurate dental shade matching.

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Evaluating the Effects of Different Polishing Methods on Color Stability of Dental Restorations in Pediatric Dentistry
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Evaluating the Effects of Different Polishing Methods on Color Stability of Dental Restorations in Pediatric Dentistry

Published on: June 6, 2025

Area of Science:

  • Dental Materials Science
  • Colorimetry
  • Clinical Dentistry

Background:

  • Accurate dental shade matching is crucial for aesthetic restorations.
  • Color-measuring devices aim to provide objective shade assessment.
  • Understanding device repeatability is essential for reliable clinical application.

Purpose of the Study:

  • To assess the intra- and inter-device repeatability of three dental color-measuring devices.
  • To evaluate repeatability across different regions of the maxillary anterior teeth (cervical, body, incisal).
  • To determine the clinical acceptability of color differences (ΔE) for repeatability.

Main Methods:

  • Three devices (VITA Easyshade compact, DeguDent Shadepilot, X-Rite ShadeVision) were used.
  • Shade measurements (CIE Lab values) were taken on 15 patients by one investigator.
  • Intraclass correlation coefficients (ICCs) and color differences (ΔE) were analyzed.

Main Results:

  • All three devices demonstrated high intra-device repeatability for all tooth regions (ICC > 0.516-0.986, ΔE < 3.03).
  • Inter-device repeatability was significantly lower across all tooth regions (ICC = 0.010-0.922, ΔE = 4.06-16.04).

Conclusions:

  • High intra-device repeatability confirms consistency when using a single color-measuring device.
  • Low inter-device repeatability indicates that results from different devices are not comparable.
  • Clinical decisions based on shade measurements require careful consideration of the specific device used.