Thixotropy — NDEB AFK MCQ
Instant feedback + full explanation. One question, done properly.
Educational content. Not a substitute for clinical judgement or local policy.
Reveal the answer and explanation
Correct answer: D — Elastomeric impression materials (PVS) — light body
Thixotropy is the property where a material has high viscosity at rest but becomes less viscous (flows more readily) when agitated, stressed, or loaded (e.g., during syringing). Light-body elastomeric impression materials (PVS, polyether) are designed to be thixotropic — they remain in place when dispensed on a tray but flow into fine detail when pressed against prepared teeth under the pressure of tray seating. This property allows accurate capture of subgingival margins and fine surface detail.
Reference: Anusavice – Phillips' Science of Dental Materials, 13th ed., 2022