Abstract
Objective: The aim of this in vitro study was to evaluate the color stability of different bulk fill composite resins after extrinsic staining with coffee. Material and methods: Forty-eight disk-shaped specimens (6 mm diameter x 2 mm thick) of each composite resin were prepared for color change test. The composite resins were divided into 4 groups (n=12): one conventional composite resin (Filtek Z250) and three bulk-fill composite resins (Filtek Bulk Fill, Aura Bulk Fill, and Opus Bulk Fill). The samples were stained with 20 mL coffee solution for 7 days, with the solution being replaced every 24 h. The color change analysis was performed using a spectrophotometer, according to the CIE Lab formula. Data were analyzed using the Analysis of variance (ANOVA) and Tukey HSD tests (?=0.05). Results: The results revealed significant differences in color change among the composite resins tested (?<0.0001). The Aura Bulk Fill and Opus Bulk Fill showed the highest color change values. Conclusions: Thus, all the resins analyzed were susceptible to extrinsic staining with coffee, and the Filtek Bulk Fill showed the lowest color change value.
Highlights
Composite resins are outstanding in the dental clinic, especially for their ability to mimic the appearance of natural teeth, in addition to having good physical and mechanical properties
The experimental groups were divided into 4 groups: a conventional composite resin (Filtek Z250 - 3M ESPE, Sumaré-SP, Brazil) and three bulk-fill restorative materials used for restoring posterior teeth (Filtek Bulk Fill- 3M ESPE, Sumaré-SP, Brazil; Aura Bulk Fill- SDI, São Paulo-SP, Brazil and Opus Bulk Fill- FGM, Joinville-SC, Brazil)
The analysis of delta L showed the same behavior of the groups as was shown in the analysis of delta E, with greater differences in luminosity values for Groups AURA BULK FILL (ABF) and OPUS BULK FILL (OBF), followed by Groups Z250 and FILTEK BULK FILL (FBF)
Summary
Composite resins are outstanding in the dental clinic, especially for their ability to mimic the appearance of natural teeth, in addition to having good physical and mechanical properties Because these materials are placed in the oral environment, they may be subjected to degradation, staining, and loss of mechanical properties over time [1], directly affecting the longevity of these restorations [2]. Insertions in increments of up to 2 mm are performed at the cavity margins with the aim of reducing the stresses caused by polymerization shrinkage [4] This technique has some disadvantages, such as the total length of time taken to perform the restoration, because each increment needs to be photopolymerized individually, and the possibility of bubbles and voids forming in the restoration [5]
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