Abstract
ObjectiveThis study evaluated the influence of light sources and immersion media on the color stability of a nanofilled composite resin.Material and MethodsConventional halogen, high-power-density halogen and high-power-density light-emitting diode (LED) units were used. There were 4 immersion media: coffee, tea, Coke® and artificial saliva. A total of 180 specimens (10 mm x 2 mm) were prepared, immersed in artificial saliva for 24 h at 37±1ºC, and had their initial color measured with a spectrophotometer according to the CIELab system. Then, the specimens were immersed in the 4 media during 60 days. Data from the color change and luminosity were collected and subjected to statistical analysis by the Kruskall-Wallis test (p<0.05). For immersion time, the data were subjected to two-way ANOVA test and Fisher's test (p<0.05).ResultsHigh-power-density LED (∆E=1.91) promoted similar color stability of the composite resin to that of the tested halogen curing units (Jet Lite 4000 plus - ∆E=2.05; XL 3000 - ∆E=2.28). Coffee (∆E=8.40; ∆L=-5.21) showed the highest influence on color stability of the studied composite resin.ConclusionThere was no significant difference in color stability regardless of the light sources, and coffee was the immersion medium that promoted the highest color changes on the tested composite resin.
Highlights
Color stability is an important parameter for modern resin-based filling materials
MN, USA) showed less change when compared to Jet Lite Plus 4000, which had a negative value of ΔL
The color change (ΔE) results showed that the Coke® medium was the one that least affected the composite resin color, indicating a statistically different mean value, and lower than the other mediums
Summary
Several factors influence the color stability of contemporary lightactivated materials, such as the photoinitiator system, the resin matrix, the light-curing unit used for polymerization, and the irradiation times. The phenomena of sorption and solubility may serve as precursors to a variety of chemical and physical processes that create biological concerns as well as produce deleterious effects on the structure and function of a resin matrix. The phenomena of sorption and solubility may serve as precursors to a variety of chemical and physical processes that create biological concerns as well as produce deleterious effects on the structure and function of a resin matrix24 These effects include swelling, plasticization and softening, oxidation and hydrolysis. For suitable performance, longevity and good clinical success of esthetic restorations, the material of choice should present adequate intrinsic characteristics that are specific for each procedure and that its polymerization is ideal, with this aspect directly related to the light-curing units and their use
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