During setting of alginate impression materials________________?
Correct answer: A. Trisodium phosphate reacts with calcium sulphate
- A. Trisodium phosphate reacts with calcium sulphate
- B. Trisodium phosphate reacts with sodium alginate
- C. Colloidal changes to sol
- D. Material in contact with soft tissues sets last
Explanation
Trisodium phosphate is a retarder that preferentially reacts with calcium sulfate, delaying formation of calcium ions until the retarder is consumed. Calcium sulfate then reacts with sodium alginate to form insoluble calcium alginate gel.
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