Shade matching potential of one-shade resin composites used for restoration repair

To evaluate shade matching ability of one-shade composites used for repair of different resin-based restorative materials. Two one-shade composites or one layering composite of 1 mm thickness were placed over non-aged or aged 3 different base materials of 1 mm thickness to simulate repair. Two millimeters thick base samples were prepared and used for reference (n=12). Shade measurements of reference and repair groups were performed with dental spectrophotometer and color difference (ΔE₀₀) were calculated according to CIEDE2000. Data were analyzed using three-way ANOVA followed by Tukey's test (α=0.05). Regardless of aging and base materials, repairing with layering composite yielded lower ΔE₀₀ than repair of one-shade composites (p<0.05). Repair of non-aged and aged GrandioDisc with any repair composite led to higher ΔE₀₀ values than repair of other base materials (p<0.05). Shade matching performance of one-shade composites for repair of different non-aged or aged resin-based material was not clinically acceptable.