Agent used as a die hardener

# Which of the following agents is used as a die hardener?
A. Cyanoacrylate
B. Nail polish
C. Volatile relief agents
D. Composite resin

The correct answer is A. Cyanoacrylate.

Gypsum dies are sometimes modified to (1) make them more abrasion-resistant, (2) change the dimensions of the dies, (3) increase the refractoriness of the dies, or (4) produce a combination
of these effects. Several means are used to increase the abrasion resistance, including silver plating, coating the surface with cyanoacrylate adhesive, and adding a die hardener to the gypsum.

Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, Anusavice, Shen, Rawls, 12th Edition, Page No: 211

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