Polyether Properties — NDEB AFK MCQ
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Correct answer: A — Hydrophilic and rigid when set
Polyether impression material (e.g., Impregum) is inherently hydrophilic (wets moist surfaces well), making it excellent for capturing detail in a moist environment (subgingival margins). It sets to a relatively rigid/stiff consistency, which can make removal difficult in undercut areas but provides excellent dimensional stability. Its accuracy is comparable to PVS. Disadvantages include rigidity (painful removal over undercuts), moisture absorption (imbibition) causing swelling if stored in water, and bitter taste.
Reference: Anusavice – Phillips' Science of Dental Materials, 13th ed., 2022