Restorative & Materials · single question
Which gypsum type is used for fabricating dies for crowns, with least porosity and lowest gauging water?
Show answer and explanation
Correct answer: D. Type IV – Die stone
Type IV – Die stone has the least porosity, lowest gauging water, highest strength, and best abrasion resistance — ideal for precision crown die fabrication.
- A. ❌ Type III (dental stone) is intermediate; used for casts and RPD models.
- B. ❌ Type II (model plaster) is more porous; used for study models.
- C. ❌ Type I (impression plaster) has the most porosity and sets very quickly; lowest quality.
- D. ✅ CORRECT – Type IV die stone: highest strength, least porosity, lowest expansion, best for crown dies.
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