Document Detail

Color stability of dental composites as a function of shade.
MedLine Citation:
PMID:  9576308     Owner:  NLM     Status:  MEDLINE    
STATEMENT OF PROBLEM: The selection of shade of composites for restorative applications may have a significant effect on color degradation through environmental exposure. PURPOSE: This study characterized the color changes in composites as a function of shade through environmental effects such as ultraviolet light exposure. MATERIAL AND METHODS: Five shades of two composites were subjected to ultraviolet light exposure at 37 degrees C for 24 hours after initial storage for 24 hours in distilled water at 37 degrees C. The lightness and chromaticity values of color were measured both before and after ultraviolet light exposure with a Minolta Chromameter. The total color change as well as changes in the lightness and chromaticity values were measured in the CIE L*a*b* scale and analyzed to monitor color degradation, if any. RESULTS: Color degradation was a significant function of shade and occurred primarily as an increase in yellowness. Color changes increased with the lightness of the shade in both composite systems. CONCLUSION: The lighter shades of composites were likely to be subject to higher color degradation through environmental effects of ultraviolet light exposure.
H Uchida; J Vaidyanathan; T Viswanadhan; T K Vaidyanathan
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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 Apr 
Date Detail:
Created Date:  1998-06-29     Completed Date:  1998-06-29     Revised Date:  2009-08-27    
Medline Journal Info:
Nlm Unique ID:  0376364     Medline TA:  J Prosthet Dent     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  372-7     Citation Subset:  D; IM    
New Jersey Dental School, New Jersey's University of Health Sciences, Newark 07103, USA.
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MeSH Terms
Analysis of Variance
Barium Compounds / chemistry,  radiation effects
Bisphenol A-Glycidyl Methacrylate / chemistry,  radiation effects
Composite Resins / chemistry*,  radiation effects
Dental Materials / chemistry*,  radiation effects
Dental Restoration, Permanent
Environmental Exposure
Materials Testing
Methacrylates / chemistry,  radiation effects
Polycarboxylate Cement / chemistry,  radiation effects
Polyethylene Glycols / chemistry,  radiation effects
Polymethacrylic Acids / chemistry,  radiation effects
Polyurethanes / chemistry,  radiation effects
Radiation Dosage
Silicon Dioxide / chemistry,  radiation effects
Ultraviolet Rays
Reg. No./Substance:
0/Barium Compounds; 0/Composite Resins; 0/Conquest composite resin; 0/Dental Materials; 0/Methacrylates; 0/Polycarboxylate Cement; 0/Polyethylene Glycols; 0/Polymethacrylic Acids; 0/Polyurethanes; 0/barium glass filler; 109-16-0/triethylene glycol dimethacrylate; 125523-74-2/urethane dimethacrylate luting resin; 1565-94-2/Bisphenol A-Glycidyl Methacrylate; 25766-59-0/polycarbonate; 7631-86-9/Silicon Dioxide

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