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5 Written Questions

5 Matching Questions

  1. Pressure
  2. Ductility
  3. Compressive stress
  4. Tensile strength for:

    a. Dental porcelain
    b. Amalgam
    c. Resin-based composite
    d. Poly
    e. Alumnia ceramic
  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
  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 ability of a material to deform physically under a <b>tensile</b> stress before it fractures
  3. c a. increases

    although ductility of the metal ↓↓
  4. d Force per unit area acting on the external surface of a material.
  5. e Ratio of compressive force to cross-sectional area prependicular to the axis of applied force.

5 Multiple Choice Questions

  1. Ultimate strength
  2. Resistance of a material to plastic deformation typically measured under an indentation load.
  3. mealibility
  4. Relative inability of material to deform plastically
  5. a. low impact

5 True/False Questions

  1. Shear stress is calculated by dividing the force by the area ________ to the force direction.

    a. perpendicular
    b. parallel
    b. parallel

    brackets for braces is a good example


  2. From mechanical property point of view, why isn't it a good idea to burnish amalgam, composites, ceramics and nonresin luting agents?because they have <b>low</b> or <b>zero</b> percent elongation.


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


  4. How does polshing of brittle material help their strength?
    by comparing the <b>area</b> underneath the elastic region.

    ↑ the area = ↑ resilience


  5. Stress vs. force
    Stress = Force / area

    stress units - MPa


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