Question 315 · LDEK · Impressions and impression materials
Agents for impregnation of retraction cords, containing iron sulfate, may have adversely affect the binding process between:
- A. all elastomers.
- B. alginates.
- C. condensation silicones.
- D. addition silicones.
- E. zinc oxide eugenol compounds.
Hint
Recall which impression material relies on a platinum catalyst that is easily poisoned by sulphur-containing contaminants.
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