The aim of this in vitro study was to evaluate the color variation of a nanohybrid composite resin (GrandioSO, VOCO), a flowable composite (GrandioSO Flow, VOCO), a heavy flow composite (GrandioSO Heavy flow, VOCO) and a sealant (Grandio Seal, VOCO) submersed in three different staining solutions (red wine, coffee, cola drink) for 14 days. Twenty samples from each tested material were prepared and divided into 4 groups, according to the materials employed. Each group was then divided into 4 subgroups, according to the submersion solutions: Subgroup “Saliva” – artificial saliva (AFNOR, Biochemazone™) as a control subgroup; Subgroup “Red Wine” – dry red wine (Negru de Purcari Wine), Subgroup “Cola” – Pepsi-cola Company, Subgroup “Coffee” – Nescafe Brasero. The samples were submersed in solutions for 14 days and stored in an incubator at 37 °C. A portable spectrophotometer NR10QC 3NH was used for color assessment after 1, 7 and 14 days of submersion, using the CIE L*a*b* system. Paired t-test, Repeated Measures ANOVA and post-hoc Bonferroni tests were used for statistical analysis. The highest value of color variation was recorded by group C after 14 days of submersion in red wine solution (ΔE=4.76), while the lowest values were shown by group B after 14 days of submersion in cola solution (ΔE=0.48). In group B, differences were observed between subgroups saliva and cola (p=0.046) after 14 days. In group C, differences were recorded after 7 days between subgroups saliva and red wine (p=0.00), after 14 days between subgroups saliva and red wine (p=0.00), and between subgroups saliva and coffee (p=0.007). In group D, differences were observed after 7 days between subgroups saliva and red wine (p=0.001) and subgroups saliva and coffee (p=0.00). Fourteen days of continuous contact with cola beverage affects the color stability of the heavy flow composite resin, while red wine or coffee consumption influences the color of the resin-based sealant. The nanohybrid composite resin and the resin-based sealant show color variations after seven days of continuous contact with red wine.
Keywords:- color stability
- composite
- nanohybrid