Question

Choose the option that has the biomaterials arranged in order of decreasing tensile strength. (PMMA : poly-methyl-methacrylate)

• A. Human compact bone $>$ PMMA bone cement $>$ Polymer foams $>$ Graphite-epoxy
• B. Human compact bone $>$ Graphite-epoxy $>$ PMMA bone cement $>$ Polymer foams
• C. Graphite-epoxy $>$ Human compact bone $>$ PMMA bone cement $>$ Polymer foams
• D. PMMA bone cement $>$ Human compact bone $>$ Polymer foams $>$ Graphite-epoxy

Hint:

- Composites (like graphite-epoxy) are much stronger than natural or polymer materials.
- Bone is stronger than PMMA cement, and foams are the weakest.

Answer 1

The Correct Option is C

Step 1: Tensile strength ranking is based on material properties.
- Graphite-epoxy (a composite) has very high tensile strength due to carbon fibers.
- Human compact bone has moderate tensile strength, higher than polymers.
- PMMA bone cement is weaker than compact bone.
- Polymer foams have the least strength.
Step 2: Therefore, decreasing order is: \[ \text{Graphite-epoxy}>\text{Human compact bone}>\text{PMMA bone cement}>\text{Polymer foams} \] \[ \boxed{\text{Graphite-epoxy \(>\) Human compact bone \(>\) PMMA bone cement \(>\) Polymer foams}} \]