Question 113 · LDEK · Dental laboratory technology
In the fabrication of a metal-porcelain crown or bridge, the working cast must be made of:
- A. model plaster, type II.
- B. dental stone, type III.
- C. high-strength dental stone, type III.
- D. dental stone, type IV.
- E. high-strength dental stone, type V.
Hint
Dies for fixed work must resist abrasion and stay dimensionally accurate — which gypsum type combines high strength with low setting expansion?
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