A restorative material which has a high proportional limit, compared with one with a lower proportional limit would have________________?
Correct answer: B. More resistance to permanent deformation
- A. Greater ductility
- B. More resistance to permanent deformation
- C. A higher modulus of elasticity
- D. A higher modulus of elasticity
- E. Greater toughness
Explanation
A higher proportional limit means the material can withstand greater stress before leaving elastic behaviour and undergoing permanent deformation. It therefore has more resistance to permanent deformation, without necessarily having greater toughness or stiffness.
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