Dental Amalgam — ORE Part 1 MCQ
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Correct answer: A — Compressive strength and wear resistance
Explanation lettering: D = shown as B · E = shown as C · C = shown as D · B = shown as E
Dental amalgam is particularly suitable for large posterior restorations because of its exceptional compressive strength (>400 MPa) and superior wear resistance. These mechanical properties allow amalgam to withstand the substantial occlusal forces in the posterior dentition and maintain longevity (15+ years in high stress-bearing applications). Fluoride release (B) and adhesion (C) are properties of glass ionomer and resin-composite systems, not amalgam. Aesthetics (D) is a recognised limitation of amalgam's metallic color. Thermal expansion (E) is mischaracterised; amalgam has low thermal expansion, which is an advantage but does not match enamel's expansion coefficient. This item tests understanding of why specific materials are selected for specific clinical demands.
Reference: Dental materials science consensus documented in peer-reviewed literature (US Patents 3,980,472; 11,065,182; 6,384,106; 6,979,702) and Scottish Dental Clinical Effectiveness Programme (SDCEP) guidance on dental amalgam (2018; sdcep.org.uk). Evidence directly supports the mechanical superiority of amalgam in large, load-bearing posterior restorations, consistent with UK and international practice. https://www.sdcep.org.uk/published-guidance/dental-amalgam/