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5 Written questions

5 Matching questions

  1. Which of the following has more resistence?

    a. Dental porcelain
    b. Amalgam
    c. Resin-based composite
    d. Poly
    e. Alumnia ceramic
  2. diametral compression test
  3. which tooth structure has the hgiher <b>propotional limit</b> and <b>modulus of elasticity</b>?

    a. enamel
    b. dentin
  4. Flexural strength
  5. Units of Modulus of elasticity
  1. a
    Force per unit area at the point of fracture of a test specimen subjected to flexural loading.
  2. b ????
  3. c Giganewtons per square meter (GN/m²), or gigapascals (<b>GPa</b>)
  4. d
    a test for tensile strength that is only used for materials that exhibit predominantly elastic deformation and little or no plastic deformation (brittle).
  5. e
    a. enamel

5 Multiple choice questions

  1. Stress and/or strain
  2. Proportional limit

  3. ductility
  4. a. low impact
  5. flexible

    The <b>maximum flexibility</b> is defined as the flexural strain that occurs when the material is stressed to its proportional limit.

5 True/False questions

  1. What does the straight line in the strain-stress curve represent?
    the region represents <b>reversible</b> elastic deformation, because the stress remains below the proportional limit.


  2. Why is the ultimate tensile strength sometimes less than the maximum stress?Because of the reduction in area, the force required to increase deformation actually decreases.


  3. average biting force
    Stress = Force / area

    stress units - MPa


  4. How does polshing of brittle material help their strength?
    by comparing the <b>area</b> underneath the elastic region.

    ↑ the area = ↑ resilience


  5. A _______ stress is caused by a load that tends to stretch or elongate a body.

    a. compressive
    b. tensile
    c. shear
    a. low impact


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