Effects of bioflavonoid-containing mouth rinses on optical properties of tooth-coloured dental restorative materials

This study investigated differences in colour (ΔE(00)) and translucency parameter (ΔTP(00)) of nanofilled/microhybrid composites and a glass-ionomer cement following immersion in bioflavonoid (Citrox)- or chlorhexidine-based mouth rinses. Sixty disc-shaped specimens (N = 5/group) of Filtek Supreme (3M), Gradia Anterior (GC) and Fuji IX (GC) were exposed to Citrox/0.2%CHX (Perio+0.2, Curaprox), Citrox/0.09%CHX (Perio+0.09, Curaprox), 0.2%CHX (Savacol, Colgate-Palmolive) or distilled water by 2-min agitation daily for 28 days in an orbital shaker at 200 rpm at 37 °C. Colour recordings were performed using a clinical spectrophometer to obtain CIELab coordinates. General linear model, ANOVA, Tukey test (α = 0.05) and Pearson correlation test were used to analyse data. ΔE(00) ranged between 0.33 (Gradia_Savacol_T28) and 6.35 (Fuji_Savacol_T28) (p < 0.001). ΔTP(00) ranged between 0.36 (Fuji_ Perio+0.2) and 1.73 (Fuji_Savacol) (p < 0.05). Savacol resulted in higher ΔE(00) of Filtek and Fuji and ΔTP(00) of Filtek than Perio+0.09 and Perio+0.2 (p = 0.005). Perio+0.09 and Perio+0.2 resulted in higher ΔE(00) at T7 than T28 (p < 0.05). There was no correlation between ΔTP(00) and ΔE(00) (r = 0.445, p = 0.147). Generally, Perio+0.2 and Perio+0.09 mouth rinses produced similar or lower ΔE(00) and ΔTP(00) than Savacol. GIC Fuji showed higher ΔE(00) and similar or higher ΔTP(00) than composites Filtek and Gradia. ΔE(00) in all materials decreased in Perio+0.2 and Perio+0.09 over time.