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5 Written questions

5 Matching questions

  1. Tensile strength for:

    a. Dental porcelain
    b. Amalgam
    c. Resin-based composite
    d. Poly
    e. Alumnia ceramic
  2. Compressive stress
  3. For brittle materials that exhibit only elastic deformation and can sustain no plastic deformation, stresses at or slightly above the ________________ result in fracture.
  4. Elastic modulus
  5. Toughness increases with increases in _____ and _________.
  1. a 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
  2. b Relative stiffness of a material; ratio of elastic stress to elastic strain
  3. c Ratio of compressive force to cross-sectional area prependicular to the axis of applied force.
  4. d
    maximum elastic stress (proportional limit)
  5. e Toughness increases with increases in strength and ductility.

5 Multiple choice questions


  1. b. dentin

    dentin → 50 MPa
    enamel → 10 MPa
  2. strength
  3. 38%
  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. Giganewtons per square meter (GN/m²), or gigapascals (<b>GPa</b>)

5 True/False questions

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

          

  2. True stressRatio of applied force to the actual cross-sectional area; however, for convenience stress is often calculated as the ratio of applied force to the initial cross-sectional area.

          

  3. Maximum stress that is required to cause fracture is called _________.Ultimate strength

          

  4. Why do prostheses sometimes fail under a very small force, even though the strength of the prosthetic material is relatively high?Flaws (could be microscopic)

          

  5. Stress
    Maximum stress that a structure can withstand without sustaining a specific amount of plastic strain (yield strength) or stress at the point of fracture (ultimate strength).