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5 Written questions

5 Matching questions

  1. Units of Modulus of elasticity
  2. ___________represents the ability of a material to sustain a large permanent deformation under a <b>tensile</b> load before it fractures.
  3. Elastic strain
  4. Plastic deformation occurs when the ______________ within the prosthesis is exceeded.
  5. Three types of stress in dentistry:
  1. a Giganewtons per square meter (GN/m²), or gigapascals (<b>GPa</b>)
  2. b 1. tensile stress
    2. shear stress
    3. compressive stress
  3. c Deformation that is recovered upon removal of an externally applied force or pressure.
  4. d Plastic deformation occurs when the <b>elastic stress limit (proportional limit)</b> within the prosthesis is exceeded.
  5. e

5 Multiple choice questions

  1. b. dentin is tougher!

    the more flexible material is the tougher it is. enamel is brittle
  2. Force per unit area acting on the external surface of a material.

  3. • The <b>stress</b> at which a test specimen exhibits a specific amount of plastic strain (0.2%)

    • The YS at 0.2% strain offset from the origin is 1536 MPa in this case.

  4. maximum elastic stress (proportional limit)
  5. 38%

5 True/False questions

  1. Poisson's ratiothe ratio of horizontal extension to vertical compression.

    Most engineering materials have values of approximately <b>0.3</b>


  2. Shear stressMaximum shear stress at the point of fracture of a test specimen.


  3. Tensile strength for:

    a. Dental porcelain
    b. Amalgam
    c. Resin-based composite
    d. Poly
    e. Alumnia ceramic
    a. Dental porcelain → 50-100 MPa
    b. Amalgam → 27-55 MPa
    c. Resin-based composite → 30-90 MPa
    d. Poly → 60 MPa
    e. Alumnia ceramic → 120 MPa


  4. the stress above which stress is no longer proportional to strain.Force per unit area of a material subjected to flexural loading.


  5. Strength depends on what factors: (4)
    Area or point of significantly higher stress associated with a structural discontinuity such as a crack or pore or a marked change in dimension of a structure.


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