title: Interaction between staining and degradation of a composite resin in contact with colored foods.
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.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, Brazil.
authors.forename: Debora
authors.initials: D
authors.lastname: Soares-Geraldo
authors.forename: Taís
authors.initials: T
authors.lastname: Scaramucci
authors.forename: Washington
authors.initials: W
authors.lastname: Steagall
authors.forename: Sheila Regina Maia
authors.initials: SR
authors.lastname: Braga
authors.forename: Maria Angela Pita
authors.initials: MA
authors.lastname: Sobral
mesh_terms: D000704:Analysis of Variance; D003124:Colorimetry; D003188:Composite Resins / Q000737:chemistry*; D005505:Food Coloring Agents / Q000737:chemistry*; D006245:Hardness Tests; D008422:Materials Testing; D017797:Prosthesis Coloring; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003188:Composite Resins; D005505:Food Coloring Agents