Restorative & Materials · single question
An alginate impression develops wrinkles on its surface. This is due to:
Show answer and explanation
Correct answer: B. Syneresis
Syneresis — spontaneous contraction of the gel with expulsion of liquid — causes surface wrinkling. Imbibition is the opposite (swelling from water absorption).
- A. ❌ Excess water produces a weaker gel.
- B. ✅ CORRECT – Syneresis causes expulsion of fluid from the gel, leading to shrinkage and surface wrinkling.
- C. ❌ Incomplete gelation produces a soft deformed impression, not wrinkling.
- D. ❌ Imbibition causes swelling, not wrinkling.
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