How home bleaching agents affect the color and translucency of CAD/CAM monolithic zirconia materials

To assess the effect of 10% carbamide peroxide (CP) and 6% hydrogen peroxide (HP) home bleaching agents on the translucency and color of monolithic zirconia. Ninety disc specimens were fabricated (diameter, 10 mm) from multi-layered (ML), ultra translucent multi-layered (UTML), and super translucent multi-layered (STML) zirconia blocks at three thicknesses (0.4,1,1.5 mm) (n=5). The samples were divided into two subgroups, which were treated with 6% HP (45 min per day) or 10% CP (8 h per day) for 14 days. The color of specimens was measured before bleaching (T0) and after bleaching on the third (T3), seventh (T7), and 14th (T14) day. Color (Delta E) and translucency (TP) changes were calculated. The thickness varieties used in the samples and the bleaching agent types used created statistically significant differences only in TP and Delta E00, respectively (p<0.05). Bleaching agents can affect TP and Delta E. Patients who have zirconia restorations should be careful when using home bleaching agents.

Automated summary

The effect of 10% carbamide peroxide and 6% hydrogen peroxide home bleaching agents on the translucency and color of monolithic zirconia was assessed. The study found that bleaching agents can significantly change the translucency and color of zirconia, suggesting caution should be taken when using home bleaching agents for patients with zirconia restorations.