Optical effects of a novel opaque liquid on the masking capacity and color stability of high-translucency pre-colored zirconia

The novel opaque liquid effectively masks discolored or metallic substrates while preserving the intended shade and optical properties of HT-Zr, exhibiting controlled penetration and yielding clinically acceptable color differences. On white or tooth‑like substrates, additional masking may be unnecessary because all opaque liquids can induce perceptible shade shifts.