Factors influencing the color stability of nano-filled composite resin
Essentials of Dentistry. 2022;3(1):77-83.
ABSTRACT
Objective: The impact of whitening toothpastes on the color stability of nano-filled composite resin is not known exactly. The aim of this in vitro study was to evaluate the color stability of nano-filled composite resin that was submitted to different staining solutions and daily tooth brushing simulations with conventional or hydrogen peroxide-containing whitening toothpaste.
Methods: Nano-filled composite resin (Filtek Ultimate) was used to fabricate disc-shaped specimens. The specimens were stored for 1 hour/day in 3 different staining solutions: artificial saliva (control), coffee, and red wine. The specimens were also mechanically brushed with conventional or hydrogen peroxide-containing whitening toothpaste for 30 minutes. Color changes were recorded at baseline and after exposure. Data were analyzed using 2-way analysis of variance and Tukey's honestly significant difference tests.
Results: Mechanical brushing succeeded in reducing color change values significantly (P < .05). The type of toothpaste did not significantly affect the color change values (P > .05). Red wine affected color change values the most, followed by coffee (P < .05).
Conclusion: The immersion of nano-filled composite resin in coffee and red wine caused a significant color change. As a result of mechanical brushing, color recovery was achieved within the acceptability threshold in specimens immersed in coffee.
KEYWORDS
Color change · color recovery · composite resin · discoloration · toothpaste
STUDY SUMMARY
This in vitro study measured the color stability of a nano-filled composite resin stored daily in artificial saliva, coffee or red wine and brushed with either a conventional or a hydrogen peroxide-containing whitening toothpaste. Red wine produced the greatest color change, followed by coffee, and mechanical brushing significantly reduced color change while the choice of toothpaste made no significant difference. Under the conditions tested, brushing returned specimens immersed in coffee to within the acceptability threshold.