Restor Dent Endod.  2024 Aug;49(3):e23. 10.5395/rde.2024.49.e23.

Can discolored dental composites be bleached in depth?

• Giachetti L
• Russo DS
• Nieri M
• Cinelli F

• KMID: 2559736
• DOI: http://doi.org/10.5395/rde.2024.49.e23

Abstract

Objectives
Previous in vitro studies determined the whitening effects of bleaching products on stained resin composite surfaces. This in vitro study aimed to verify the effectiveness of a whitening system on composite resin previously subjected to pigmentation, specifically examining the depth of whitening effectiveness within the material structure.
Materials and Methods
A commercially available nano-filled composite resin was used. Specimens were stained using a coffee-based solution and a 10% carbamide peroxide-based gel was employed as the whitening agent. The pigment’s penetration and the effect of the bleaching gel were evaluated by measuring color (CieLab values) from the outer edge to the inner part of the specimens. Color measurements were taken at 14 points, starting from 0.1 mm from the external perimeter up to 3.0 mm.
Results
Analysis of variance tests showed a statistically significant difference between the Control Group (CG), Pigmentation Group, and Whitening Group. The whitening agent was effective up to 1.5 mm in depth, with Whiteness index (W) values not statistically different from those of CG up to 0.5 mm in depth.
Conclusions
Whitening agents on nano-filled resin composite previously pigmented appear effective in restoring the W to values similar to the original, particularly in the superficial layers of the sample.

Keyword

Bleaching agents; Color; Composite resins; Food coloring agents; Tooth bleaching; Tooth discoloration

Figure

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  Figure 1 Schematic representation of specimen preparation and analysis.CG, Control Group; PG, Pigmentation Group; WG, Whitening Group.

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  Figure 2 The picture shows how the points where the color detection was made were identified.

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  Figure 3 Trend of Whiteness index (W), relative to the 3 groups analyzed, at the different depth levels. The trends of the Control Group (CG) and Whitening Group (WG) are similar. In the Pigmentation Group (PG), the stains have marked values on the surface that gradually decrease.

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