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5 Written questions

5 Matching questions

  1. The ability of a material to sustain considerable permanent deformation without rupture under <b>compression</b>, as in hammering or rolling into a sheet, is termed ____________.
  2. Materials with a high elastic modulus have:

    a. high strength values.
    b. low strength values.
  3. A value of 0.3 for Poisson's ratio is typical. Thus, the shear modulus is usually about ___% of the elastic modulus.
  4. A low elastic modulus and a low tensile strength suggest ___________ resistance.

    a. low impact
    b. high impact
  5. Three types of stress in dentistry:
  1. a mealibility
  2. b 1. tensile stress
    2. shear stress
    3. compressive stress
  3. c 38%
  4. d they could have either. they are independent of each other.
  5. e a. low impact

5 Multiple choice questions

  1. • 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.
  2. Ultimate strength

  3. a test for tensile strength that is only used for materials that exhibit predominantly elastic deformation and little or no plastic deformation (brittle).
  4. of enamel rod orientation.
  5. b. tensile

5 True/False questions

  1. Strain
    Change in length per unit initial length.

    Units are in %


  2. Units of Modulus of elasticityGiganewtons per square meter (GN/m²), or gigapascals (<b>GPa</b>)


  3. (T/F) Stiffness of a dental prosthesis can increase by increasing its thickness.Toughness increases with increases in strength and ductility.


  4. From mechanical property point of view, why isn't it a good idea to burnish amalgam, composites, ceramics and nonresin luting agents?Stress and/or strain


  5. 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


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