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Effect of Staining and External Bleaching on the Color Stability and Surface Roughness of Universal-Shade Resin-Based
AlHanouf AlHabdan1, Amal Alsuhaibani2, Lama Alomran2
1Department of Restorative Dental Sciences, King Saud University, Riyadh, Saudi Arabia.
Clinical, Cosmetic and Investigational Dentistry
|January 13, 2025
Summary
Both universal-shade and nanohybrid composites showed acceptable color changes after coffee staining and 40% hydrogen peroxide bleaching. However, staining and bleaching increased surface roughness in all tested resin-based composites.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials
Background:
- Dental composites are widely used for aesthetic restorations.
- Assessing the impact of staining and bleaching on composite properties is crucial for clinical longevity.
- Universal-shade and nanohybrid composites represent common choices for dental restorations.
Purpose of the Study:
- To evaluate the color stability of universal-shade and nanohybrid composites after staining and bleaching.
- To assess the effect of staining and bleaching on the surface roughness of these dental composites.
- To compare the performance of two universal-shade and two nanohybrid composites under simulated clinical conditions.
Main Methods:
- Four types of resin-based composites (two universal-shade, two nanohybrid) were tested.
- Specimens were subjected to coffee staining followed by in-office bleaching with 40% hydrogen peroxide.
- Color stability (L*a*b* parameters) and surface roughness (Ra) were measured at baseline and various time points.
Main Results:
- All tested composites exhibited clinically acceptable color changes after staining and bleaching.
- Both staining and subsequent bleaching significantly increased the surface roughness of the resin-based composites.
- Statistically significant differences in color and surface roughness were observed among the materials and treatment modes.
Conclusions:
- Universal-shade and nanohybrid composites demonstrate acceptable color stability when exposed to coffee staining and hydrogen peroxide bleaching.
- External bleaching and coffee staining negatively impact the surface integrity of resin-based composites, increasing roughness.
- Clinicians should consider the potential for increased surface roughness when using these materials in aesthetic zones subjected to staining and bleaching procedures.
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