Document Detail

The effects of manipulative variables on the color of ceramic metal restorations.
MedLine Citation:
PMID:  3050048     Owner:  NLM     Status:  MEDLINE    
Certain variables were tested for their influence on the color of ceramic metal restorations. The variables included firing temperature, condensation technique, modeling liquid, and brand of porcelain. In addition, the color of different nominal shades was compared. The color was measured with a Minolta CR-121 small-area colorimeter. The small (7 mm2) measuring area enabled readings to be made on actual crown specimens rather than disks. The results were expressed in the CIELAB color system enabling comparisons to be made related to visual perception. The following conclusions can be drawn from the study. 1. The small-area colorimeter is able to detect statistically significant and perceivable color differences between shades of porcelain. The variation in color parameters associated with making replications of a restoration is significantly greater than the error associated with making repeated color measurements of the same restoration. 2. Restorations made with the different brands of porcelain studied have noticeably different colors despite having the same nominal shade. 3. Color changes caused by the choice of modeling liquid were not statistically significant in this study. If the mean color differences are truly representative, using Rainbow or Carv-eze modeling liquids with Vita VMK porcelain may produce color changes that are just barely detectable. 4. The manipulative variables of firing temperature and condensation have little influence on the color of the restorations.
S F Rosenstiel; W M Johnston
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of prosthetic dentistry     Volume:  60     ISSN:  0022-3913     ISO Abbreviation:  J Prosthet Dent     Publication Date:  1988 Sep 
Date Detail:
Created Date:  1988-11-23     Completed Date:  1988-11-23     Revised Date:  2000-12-18    
Medline Journal Info:
Nlm Unique ID:  0376364     Medline TA:  J Prosthet Dent     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  297-303     Citation Subset:  D; IM    
Section of Restorative and Prosthetic Dentistry, Ohio State University, College of Dentistry, Columbus.
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MeSH Terms
Dental Alloys*
Dental Porcelain*
Denture Design
Gold Alloys
Reg. No./Substance:
0/Dental Alloys; 0/Gold Alloys; 12001-21-7/Dental Porcelain; 7440-05-3/Palladium

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

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