The effect of water storage and light exposure on the color and translucency of a hybrid and a microfilled composite

Statement of Problem. Internal discoloration may occur with the intraoral use of resin-based restoration materials. Water storage and light exposure influence the color properties of microfilled and hybrid composites. Purpose. The purpose of this study was to determine color and translucency changes in a hybrid and a microfilled composite after light exposure with and without water storage. Material and Methods. A hybrid (Tetric) and a microfilled composite (Silux Plus) were subjected to artificial daylight with and without water storage. Tristimulus Yxy values were determined colorimetrically against a black or a white background. Differences from baseline were calculated as ΔE*ab for up to 1 month. After 1 month, ΔL*, Δa*, Δb*, and the contrast ratio ΔC were calculated. Data were analyzed with 2-way analysis of variance (P