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Color stability of composite resins
Y G Chang1, M L Swartz, B K Moore
1Department of Operative Dentistry, School of Dentistry, Kaohsiung Medical College, Taiwan, Republic of China.
Gaoxiong Yi Xue Ke Xue Za Zhi = the Kaohsiung Journal of Medical Sciences
|October 1, 1990
Summary
Visible light-cured and chemically-cured composite resins showed varying color stability. Photocured resins demonstrated better color stability when stored in water, while UV light caused significant color changes across brands.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Color Science
Background:
- Composite resins are widely used dental restorative materials.
- Color stability is a critical aesthetic and clinical performance factor.
- Exposure to environmental factors like UV light and moisture can affect resin color.
Purpose of the Study:
- To investigate the color stability of visible light-cured and chemically-cured composite resins.
- To evaluate the impact of UV light irradiation and aqueous storage at elevated temperatures on resin color.
Main Methods:
- Seven visible light-cured and three chemically-cured composite resins were tested.
- Specimens were subjected to UV light irradiation and storage in water at 37°C.
- Color change was assessed using both visual evaluation and colorimetric measurements.
Main Results:
- A significant correlation was observed between visual color assessment and colorimetric data.
- Photocured composite resins exhibited considerable brand-to-brand variation in color change under UV light.
- Chemically-cured resins showed less color shift than photocured resins under UV light but within a similar range.
- Photocured resins displayed superior color stability compared to chemically-cured resins when stored in water at elevated temperatures.
Conclusions:
- Composite resin color stability is influenced by curing method and environmental exposure.
- Photocured resins offer better color stability in aqueous, elevated temperature conditions.
- UV light exposure can induce significant color alterations in visible light-cured composite resins, with notable inter-brand differences.