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5 Written questions

5 Matching questions

  1. Proportional limit
  2. Three types of stress in dentistry:
  3. Why do prostheses sometimes fail under a very small force, even though the strength of the prosthetic material is relatively high?
  4. Toughness increases with increases in _____ and _________.
  5. When stress is induced in a two-unit cantilever bridge, where you would expect the tensile and compressive stress develop?
  1. a
    Maximum stress at which stress is proportional to strain and above which plastic deformation occurs.

    in this case: PL= 1020 MPa
  2. b Flaws (could be microscopic)
  3. c 1. tensile stress
    2. shear stress
    3. compressive stress
  4. d Toughness increases with increases in strength and ductility.
  5. e
    Tension would develop on the occlusal half where as compression would develop in the gingival half.

5 Multiple choice questions


  1. b. dentin

    dentin → 50 MPa
    enamel → 10 MPa
  2. The relative amount of elastic energy per unit volume released on unloading of a test specimen.
  3. Force per unit area acting on the external surface of a material.
  4. Compressive <b>stress</b> within a compression test specimen at the point of fracture.

    note: compressive stress -Ratio of compressive force to cross-sectional area perpendicular to the axis of applied force.

  5. the region represents <b>reversible</b> elastic deformation, because the stress remains below the proportional limit.

5 True/False questions

  1. Stress vs. forceForce per unit area within a structure subjected to an external force or pressure (See Pressure).

          

  2. BrittlenessRelative inability of material to deform plastically

          

  3. the stress above which stress is no longer proportional to strain.1. tensile stress
    2. shear stress
    3. compressive stress

          

  4. the restorative material should exhibit a moderately ____ elastic modulus and relatively ____ resilience, thereby limiting the elastic strain that is produced.Because of the reduction in area, the force required to increase deformation actually decreases.

          

  5. A low elastic modulus and a low tensile strength suggest ___________ resistance.

    a. low impact
    b. high impact
    b. tensile