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Acceptability of shade differences in metal ceramic crowns
1Division of Fixed Prosthodontics, Faculty of Dentistry, University of Manitoba, Winnipeg, Canada.
The Journal of Prosthetic Dentistry
|April 29, 1998
Summary
Determining acceptable color differences in metal ceramic crowns is crucial. This study found that observers are more sensitive to redness variations (1.1 delta E) than yellowness variations (2.1 delta E) for restorations.
Area of Science:
- Dental Materials Science
- Color Science
- Restorative Dentistry
Background:
- Objective color measurement is vital in esthetic restorative materials research.
- Specific parameters for perceptible and acceptable color differences in metal ceramic crowns remain undetermined.
Purpose of the Study:
- To investigate the relationship between instrumental color differences (delta E) using the CIELAB system and human observer assessments in metal ceramic crowns.
- To establish thresholds for perceptibility and clinical acceptability of color differences.
Main Methods:
- Utilized the CIELAB colorimetric system for objective color difference measurement.
- Presented participants with pairs of metal ceramic crowns exhibiting varying color differences.
- Collected subjective assessments on color difference perceptibility and clinical acceptability.
Main Results:
- Instrumental and visual assessments of color differences showed discrepancies across different color dimensions.
- Acceptability thresholds for color differences were established: 1.1 delta E for red-varying crowns and 2.1 delta E for yellow-varying crowns.
- Perceptibility thresholds were significantly lower than acceptability thresholds.
Conclusions:
- Clinical acceptability of color differences is influenced by chromaticity.
- Observers exhibit heightened sensitivity and criticality towards redness variations compared to yellowness variations in metal ceramic crowns.