Question 275 (part 2) · LDEK · Impressions and impression materials
Silicone additive materials release hydrogen during binding, that is why casting working model:
- A. should be performed immediately after the release of the impression.
- B. it does not matter.
- C. should be performed not earlier than 30 min after.
- D. it should be cast up to 20 min.
- E. these materials do not release hydrogen.
Hint
Hydrogen gas released from the impression surface would create bubbles in the gypsum if the cast were poured too soon.
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