Abstract
Composite resins might be susceptible to degradation and staining when in contact with some foods and drinks. This study evaluated color alteration and changes in microhardness of a microhybrid composite after immersion in different colored foods and determined whether there was a correlation between these two variables. Eighty composite disks were randomly divided into 8 experimental groups (n = 10): kept dry; deionized water; orange juice; passion fruit juice; grape juice; ketchup; mustard and soy sauce. The disks were individually immersed in their respective test substance at 37 ºC, for a period of 28 days. Superficial analysis of the disk specimens was performed by taking microhardness measurements (Vickers, 50 g load for 45 seconds) and color alterations were determined with a spectrophotometer (CINTRA 10- using a CIEL*a*b* system, 400-700 nm wavelength, illuminant d65 and standard observer of 2º) at the following times: baseline (before immersion), 1, 7, 14, 21 and 28 days. Results were analyzed by ANOVA and Tukey's test (p < 0.05). Both variables were also submitted to Pearson's correlation test (p < 0.05). The passion fruit group underwent the greatest microhardness change, while the mustard group suffered the greatest color alteration. Significant positive correlation was found between the two variables for the groups deionized water, grape juice, soy sauce and ketchup. Not all color alteration could be associated with surface degradation.
Highlights
In the era of the tooth-colored dental restorations, color stability has become one of the major requirements of restorative materials
The long-term color changes in composite restorations can occur due to surface and marginal staining, microleakage, wear-dependent surface changes, and internal material deterioration, which may compromise the visual acceptability of these restorations and result in additional expenses for replacement.[2]
In modern societies diet includes a wide range of colored foods and drinks, which can affect the natural color of composite restorations to different degrees
Summary
In the era of the tooth-colored dental restorations, color stability has become one of the major requirements of restorative materials. Surface staining of a composite is mainly related to the absorption or adsorption of coloring substances,[4,5,6,7] such as those found in the patient’s diet. There are some other important colored foods that are very common in the patient’s diet, such as ketchup and mustard, and yet, the effects of these foods on the color of composites have received little attention. Fontes et al.[10] advised additional studies to investigate the color stability of composite resin-based materials
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