Dimensional stability of hydrocolloid impressions may be achieved by_________________?

Correct answer: D. Using humidor

A. Using less water powder ratio
B. Storing the impression under water
C. Prolonged manipulation
D. Using humidor

Explanation

Hydrocolloid impressions lose or gain water easily, so a delay before pouring is best managed in a humid environment. A humidor limits water exchange, whereas storage in water can distort the impression.

Submitted by a TestUstad contributor and published by the TestUstad editorial teamLast updated 18 September 2026

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