Ultimate Strength Definition — MFDS Part 1 MCQ

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EasyDental MaterialsUltimate Strength DefinitionMFDS Part 1

During a uniaxial tensile test of a dental material, which property is represented by the maximum stress reached on the stress–strain curve before the specimen fails?

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Correct answer: C — Ultimate tensile strength

Explanation lettering: E = shown as A · C = shown as B · A = shown as C · B = shown as D · D = shown as E

A is correct. Ultimate tensile strength is the maximum engineering stress attained during tensile loading—the peak of the stress–strain curve. It should not be defined simply as the stress at fracture because, in a ductile material, fracture may occur after necking at an engineering stress below the maximum. The modulus of elasticity describes stiffness and is derived from the slope of the elastic region. Hardness is resistance to indentation or scratching. Resilience is the energy absorbed within the elastic range, whereas ductility is the capacity for plastic deformation before fracture.

Reference: Dos Reis-Prado AH et al. Injectable thermosensitive antibiotic-laden chitosan hydrogel for regenerative endodontics. Bioactive Materials. 2025; Figure 4: maximum stress (ultimate strength). https://pubmed.ncbi.nlm.nih.gov/39850022/