Color Stability of Extrinsically Colored Monolithic Zirconia: A Narrative Review

values remaining within clinical thresholds. Mechanical surface alterations, particularly occlusal adjustments exceeding 100 μm, were identified as the most significant factor influencing discoloration. Chemical exposure to staining agents such as coffee produced moderate color changes, and while thermocycling alone had a limited impact, it affected translucency more than color stability. Extrinsically stained zirconia crowns retain satisfactory color stability and esthetic durability over time, provided that the glaze layer remains intact, and surface adjustments are limited. Their longevity depends more on clinical handling than on oral conditions.