Effect of home and over the contour bleaching on stainability of CAD/CAM esthetic restorative materials

Objective To determine the effect of home and over the counter bleaching on the stainability of CAD/CAM restorative materials, and to correlate the surface roughness with discoloration. Material and Methods Specimens were fabricated from feldspathic ceramic, an hybrid ceramic, a resin nano‐ceramic, and lithium disilicate‐reinforced glass ceramic. After baseline surface roughness (Ra1) and color measurement, each material was randomly divided into three groups according to bleaching regimen as Opalescence PF and; Opalescence Go; control. Then, the second color and surface roughness (Ra2) measurements were made. Thereafter, all specimens were immersed in a coffee solution for 12 days and the third color measurement was made. Color and whiteness change (CIELAB— ΔEab, CIEDE2000—ΔE00, whiteness index—ΔWID) were calculated after bleaching (ΔE1;ΔE001;ΔWID1) and immersion in the coffee solution (ΔE2;ΔE002;ΔWID2). Results According to both CIELAB, CIEDE 2000 and WID formulas, the highest mean ΔE1, ΔE2, ΔWID1, ΔWID2 values were observed for LAVA Ultimate groups while the lowest values were measured for e.max CAD groups. The findings also showed that there was a positively significant relationship between Ra2, and ΔE2 and ΔWID2. Conclusions Type of restorative materials and bleaching agents had an impact on color change after bleaching and immersion in coffee. Clinical Significance Home and over‐the‐counter bleaching agents may cause an increase in susceptibility of restorative materials to staining.