Provisional Crown Materials — NDEB AFK MCQ
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Correct answer: A — Polymethyl methacrylate (PMMA) or bis-acryl composite resin
Polymethyl methacrylate (PMMA, e.g., Jet acrylic) and bis-acryl composite resins (e.g., Protemp, Luxatemp) are the two most commonly used materials for chairside fabrication of provisional (interim/temporary) crowns. PMMA is an auto-polymerising acrylic resin — economical but exothermic. Bis-acryl composites set via dual-cure, generate less heat, shrink less, and provide better marginal adaptation. Both provide adequate aesthetics and strength for the provisional period.
Reference: Shillingburg – Fundamentals of Fixed Prosthodontics, 4th ed., 2012