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5 Written questions

5 Matching questions

  1. average biting force
  2. in most cases fracture occurs because of the _____ stress component.

    a. compressive
    b. tensile
    c. shear
  3. The __________ of a material is defined as the average level of stress at which a material exhibits a certain amount of initial plastic deformation or at which fracture occurs in test specimens of the same shape and size.
  4. Elastic modulus
  5. Compressive stress
  1. a 756 N
  2. b b. tensile
  3. c Ratio of compressive force to cross-sectional area prependicular to the axis of applied force.
  4. d strength
  5. e Relative stiffness of a material; ratio of elastic stress to elastic strain

5 Multiple choice questions

  1. Relative inability of material to deform plastically

  2. Tension would develop on the occlusal half where as compression would develop in the gingival half.
  3. True

    however, the <b>elastic modulus</b> is always a constant. never changes! it describes material's <b>relative</b> stiffness.
  4. 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
  5. the ratio of horizontal extension to vertical compression.

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

5 True/False questions

  1. Shear strengthMaximum shear stress at the point of fracture of a test specimen.

          

  2. the stress above which stress is no longer proportional to strain.Proportional limit

          

  3. Strength depends on what factors: (4)1. <b>strain rate</b>
    2. the shape of the test speciment
    3. the surface finish (control flaws)
    4. the environment in which material is tested

          

  4. Three types of stress in dentistry:
    a test for tensile strength that is only used for materials that exhibit predominantly elastic deformation and little or no plastic deformation (brittle).

          

  5. When a metal had been stressed beyond its proportional limit, the hardness and strength of the metal ________ at the area of deformation.

    a. increases
    b. decreases
    Proportional limit