The impression with the least dimensional change upon disinfection is_______________?
Correct answer: A. Addition poly silicone
- A. Addition poly silicone
- B. Agar-agar
- C. Polysulphide
- D. Polyether
Explanation
Addition silicone has excellent dimensional stability because it produces no volatile alcohol by-product during setting. Condensation silicone releases alcohol and therefore shows greater shrinkage, especially if pouring is delayed.
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