Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Can discolored dental composites be bleached in depth?

  • Luca Giachetti (Department of Experimental and Clinical Medicine, Unit of Dentistry, University of Florence) ;
  • Daniele Scaminaci Russo (Department of Experimental and Clinical Medicine, Unit of Dentistry, University of Florence) ;
  • Michele Nieri (Department of Experimental and Clinical Medicine, Unit of Dentistry, University of Florence) ;
  • Francesca Cinelli (Department of Experimental and Clinical Medicine, Unit of Dentistry, University of Florence)
  • Received : 2024.01.22
  • Accepted : 2024.05.16
  • Published : 2024.08.31
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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.

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References

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