Impression Materials — NDEB AFK MCQ
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Correct answer: E — Addition silicone (polyvinyl siloxane)
Polyvinyl siloxane (addition silicone, PVS) is considered the gold standard impression material for fixed prosthodontics. It provides excellent dimensional accuracy, fine detail reproduction (20 μm), long-term dimensional stability, and predictable elastic recovery. It is hydrophobic in its unset state (hydrophilic modifiers are added to newer formulations). Alginate lacks sufficient accuracy and dimensional stability for crown and bridge work.
Reference: Anusavice – Phillips' Science of Dental Materials, 13th ed., 2022