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Color stability of new-generation indirect resins for prosthodontic application
1School of Dental Medicine, Southern Illinois University, Alton, Ill., USA. rodougl@siue.edu
The Journal of Prosthetic Dentistry
|February 11, 2000
Summary
New indirect resins show promising color stability for dental restorations. Two ceramic-polymer systems matched porcelain stability after accelerated aging, indicating clinical acceptability for full contour restorations.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Color Science in Dentistry
Background:
- New-generation indirect resins are proposed for full contour dental restorations.
- Previous resin systems exhibited color instability, limiting their application.
Purpose of the Study:
- To evaluate and characterize the color stability of new-generation indirect resins (ceramic-polymers).
- Assess color changes after accelerated aging to determine clinical suitability.
Main Methods:
- Four indirect resin systems, one direct resin, and a dental porcelain control underwent 300 hours of accelerated aging.
- Color parameters were measured using the Commission International de l'Eclairage Lab (CIELAB) system.
- Color changes (DeltaE) were analyzed using ANOVA and least-squared means tests.
Main Results:
- Indirect resins showed color changes between 0.62 and 3.40 DeltaE units after 300 hours.
- Two products exhibited color stability comparable to the dental porcelain control.
- No significant differences in color stability were found between tested materials and the control.
Conclusions:
- All tested indirect resins demonstrated clinically acceptable color stability.
- Color shifts in ceramic-polymers were primarily due to changes in chroma, not lightness.
- New-generation indirect resins show potential for durable and aesthetically pleasing dental restorations.