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Updated: Jan 30, 2026
Evaluating the Effects of Different Polishing Methods on Color Stability of Dental Restorations in Pediatric Dentistry
Published on: June 6, 2025
Effect of two whitening agents on the color of composite dental restorations
José Amengual-Lorenzo1, José-María Montiel-Company2, Carlos Bellot-Arcís3
1Associated Professor, Prosthodontics Teaching Unit, Department of Stomatology, Faculty of Medicine and Dentistry, University of Valencia (Spain).
Background:
To evaluate color changes to composite resins used to restore extracted teeth compared with composite discs after whitening with two agents: hydrogen peroxide (HP) and carbamide peroxide (CP).
Material And Methods:
Ten human molars with class V vestibular and palatine cavity preparation obturated with Vita hybrid nanocomposite were hemisected to obtain 20 specimens assigned randomly to two groups: O1 and O2. Twenty composite discs were divided into two groups: D1 and D2. The groups O1 and D1 were treated with 16% CP, while groups =2 and D2 were treated with 37.5 % HP. Chromaticity coordinates L*, a* and b* were registered using a spectrophotometer.
Results:
Statistically significant differences were found in O1 for L* and a*, in O2 for all three coordinates, and in D1 and D2 only for L*. Comparisons between groups found significant differences in ΔEe (end of treatment) between O1 and O2, between O2 and D2, and between D1 and O1.
Conclusions:
Both whitening agents produced significant decreases in the three-color components of composites used for dental restorations, while color changes to composite discs were limited to changes in luminosity. HP produced a greater color change to composite dental restorations than to composite discs. Key words:In vitro study, whitening agents, hydrogen peroxide, and carbamide peroxide, dental restorations.
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