In large Class III and IV cases, OMNICHROMA may experience shade-matching interference due to a lack of surrounding dentition. BLOCKER is a supplementary material to be used in conjunction with OMNICHROMA as a lingual layer to prevent shade-matching interference in these cases. BLOCKER can also be used to mask slight staining, or to reconstruct a highly opaque tooth. Features: Specially formulated to prevent shade-matching interference for large anterior cases when used with OMNICHROMA. Excellent handling, strength, and polishability. Includes: (20) .2g PLT Blocker