Effect of office bleaching on the color change and roughness of leucite reinforced CAD/CAM material: In vitro study

Background Evaluation of the effect on the discoloration and surface roughness materials of daily beverages of restorative is very important for the long-term use of restorations. The this study different aim of was to investigate the effect of surface roughness of office bleaching on agent color change, translucency and leucite-reinforced Computer Aided Desing/ Computer Aided Manufacturing (CAD/CAM) material after to exposure beverages. Methods In this study, all of the IPS Empress CAD/CAM ceramic block specimens were treated with a glaze layer and then randomly divided into three groups. The samples (n = 25) in Group 1 (Control) were not treated (glaze layer was left). The glaze layer of the other samples (n = 50) was abraded by the same researcher. While the samples in Group 2 were treated with Optrafine (optrafine after glazing), those in Group 3 were subjected to surface treatment with Eve polishing kits (eve kit after glazing). The samples were then immersed in five different beverages (cola, coffee, tea, fruit juice and distilled water) and clinic-type bleaching was applied. Color measurements were recorded by spectrophotometer and surface roughness (Ra) values were recorded by profilometer. Color change (ΔE ₀₀ ) values were calculated using the CIE2000 formula. Results As a result of the analysis of variance, it was determined that the surface finishing process and the type of beverage used were very significant (p < 0.001). When partial eta squared values were examined, it was determined that the factor with the highest effect on color change was beverage and the factor with the least effect was time. It was determined that the factor with the highest effect on the translucency values was the interaction of surface finishing, beverage and time, while the factor with the least effect was the interaction of surface finishing and time. It was determined that the factor with the highest effect on the surface roughness values was the surface finish and the factor with the least effect was the interaction of surface finish and beverage. Conclusions The application of glaze surface finishing is important for the color stability and roughness of CAD/CAM ceramic samples. Bleaching agents containing high concentrations of HP should be used with caution as they may cause surface changes on dental materials. Clinical significance: Although bleaching of glass ceramic restorations with bleaching agents containing 40% hydrogen peroxide is effective to remove stains, maintaining the glaze surface finish is critical for color stability and surface integrity of CAD/CAM ceramics. As high concentrations of bleaching agents can cause surface changes, material selection and patient education should be carefully considered in clinical practice.