The main ingredient in dental plaster in_______________?
Correct answer: B. Calcium sulphate hemihydrate
- A. Calcium phosphate
- B. Calcium sulphate hemihydrate
- C. Calcium anhydrate
- D. Calcium sulphate dihydrate
Explanation
Dental plaster is mainly calcium sulphate hemihydrate, which reacts with water to form calcium sulphate dihydrate. Calcium sulphate dihydrate is the set product, not the main ingredient before mixing.
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