Document Detail

Acceptability of shade differences in metal ceramic crowns.
MedLine Citation:
PMID:  9553875     Owner:  NLM     Status:  MEDLINE    
STATEMENT OF PROBLEM: Application of technology that quantify color and color differences is currently used in esthetic restorative materials research. However, parameters for the size of perceptible and acceptable color differences in metal ceramic crowns have not been determined. PURPOSE: The CIELAB colorimetric system was used to study the relationship between instrumentally measured color differences (delta E) and human observer assessment of color differences in metal ceramic crowns. MATERIAL AND METHODS: Subjects were shown pairs of metal ceramic crowns whose color difference varied from indistinguishable to obvious. The subjects attempted to discern a difference in each pair's color and indicated the clinical acceptability of the shade difference between the crown pairs. RESULTS: Correlations between instrumental and visual assessment of color differences in these crown pairs did not agree in all dimensions of color space. Thresholds acceptability of color differences were 1.1 delta E units for red-varying crowns and 2.1 delta E units for yellow-varying crowns. Thresholds for perceptibility judgments were significantly lower than thresholds for acceptability judgments. CONCLUSIONS: Acceptability thresholds were found to be dependent on chromaticity. Observers were more sensitive and critical of crowns whose color differed in redness as opposed to crowns whose color differed to the same extent in yellowness.
R D Douglas; J D Brewer
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of prosthetic dentistry     Volume:  79     ISSN:  0022-3913     ISO Abbreviation:  J Prosthet Dent     Publication Date:  1998 Mar 
Date Detail:
Created Date:  1998-05-26     Completed Date:  1998-05-26     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0376364     Medline TA:  J Prosthet Dent     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  254-60     Citation Subset:  D; IM    
Division of Fixed Prosthodontics, Faculty of Dentistry, University of Manitoba, Winnipeg, Canada.
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MeSH Terms
Chi-Square Distribution
Color / standards*
Color Perception
Consumer Satisfaction
Differential Threshold
Linear Models
Metal Ceramic Alloys*
Observer Variation
Prosthesis Coloring / standards*
Reg. No./Substance:
0/Metal Ceramic Alloys

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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