Elasticity — NDEB AFK MCQ

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Which property describes a material's ability to return to its original shape after removal of an applied force without permanent deformation?

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Correct answer: E — Elasticity

Elasticity (elastic behaviour) is the ability of a material to return to its original dimensions after the applied stress is removed, without any permanent deformation. The elastic modulus (Young's modulus) quantifies stiffness — the ratio of stress to strain within the elastic region. Beyond the elastic limit (proportional limit), the material undergoes permanent (plastic) deformation. Dental impression materials must have high elastic recovery to accurately reproduce tooth/soft tissue anatomy.

Reference: Anusavice – Phillips' Science of Dental Materials, 13th ed., 2022