Comparative Study Regarding the Colorimetric Changes of Two Composite Resins after Immersion in Several Beverages and One Antibacterial Mouthwash

摘要

The aim of the study was to assess the colorimetric changes of two composite resins immersed in five solutions as follows: saliva (control), saliva and coffee, saliva and red wine, saliva and coca-cola, saliva and Corsodyl. The study group included 200 samples of composite resins, divided in two groups (Filtek Ultimate and Filtek Z250, 3M ESPE Dental Products, St. Paul, USA), each sample with 20mm diameter and 1,5mm thickness. The pH of immersion solutions was assessed. The samples were divided in five study groups, each sample was immersed in one of the immersion solutions, at 37° C. For each group, 10 specimens have been immersed for 24 h in the storage solution and the other ten specimens have been stored for seven days. The colorimetric measurements were performed, using Lovibond Reflectance Tintometer RT, Lovibond Brand UK. The colorimetric differences (AE) defined by system CIE L *a *b * between the control group and the study group, were assessed for each immersion period. The test U Mann-Whitney was applied to compare the study groups with the control group, and test Kruskal Wallis was applied for ΔE values. The assessment of colorimetric changes (ΔE) have shown differences between the control group (saliva) and the study groups as follows: Control 1). The test U Mann-Whitney showed statistically significant differences (p = 0.0001) between the control group and the study groups for both composite resins. The test Kruskal Wallis also showed statistically significant differences for values ΔE(p< 0.05). The composite resins Filtek Ultimate and Filtek 1250 presented visible colorimetric changes after immersion in tested solutions. The most obvious changes were observed after immersion in Coca cola, coffee and red wine. Filtek Ultimate was more stable comparing with Filtek 1250 regarding colorimetric changes.