Restorative & Materials · single question
Among restoration materials, which has the HIGHEST flexural strength?
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Correct answer: D. Metal (metal alloy)
✓ D) Metal alloy has the highest flexural strength.
Flexural strength hierarchy: Metal alloys (gold, base metal) ≈ 400–700 MPa → Zirconia (~900–1200 MPa for Y-TZP, actually highest among ceramic-based materials) → Lithium disilicate (~400 MPa) → feldspathic porcelain (~60–70 MPa) → PMMA (~60–70 MPa). Note: If the question specifically compares metal vs ceramics: metal > ceramics. Zirconia is the strongest ceramic. For subgingival finish lines with high flexural demands: metal-ceramic or zirconia are preferred.
Flexural strength hierarchy: Metal alloys (gold, base metal) ≈ 400–700 MPa → Zirconia (~900–1200 MPa for Y-TZP, actually highest among ceramic-based materials) → Lithium disilicate (~400 MPa) → feldspathic porcelain (~60–70 MPa) → PMMA (~60–70 MPa). Note: If the question specifically compares metal vs ceramics: metal > ceramics. Zirconia is the strongest ceramic. For subgingival finish lines with high flexural demands: metal-ceramic or zirconia are preferred.
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