Operative Dentistry: Hand Instruments
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Questions and Answers

What is the primary purpose of balance contra-angling in dental instruments?

  • To provide a comfortable grip for the operator
  • To increase the cutting edge of the blade
  • To allow for the concentration of force onto the blade without causing rotation (correct)
  • To facilitate the classification of instruments according to shank angles
  • What is the maximum deviation from the axis that is allowed for the blade edge in an optimally designed instrument?

  • 1 to 5 mm
  • 1 to 2 mm (correct)
  • 5 to 10 mm
  • 0.5 to 1 mm
  • What is the primary function of the secondary cutting edges in single-beveled instruments?

  • To provide additional cutting capacity (correct)
  • To extend the length of the blade
  • To prevent rotation of the instrument
  • To form the primary cutting edge
  • What is the unit of measurement used to express the width of the blade or length of the cutting edge in an instrument formula?

    <p>Tenths of a millimeter (0.1 mm)</p> Signup and view all the answers

    What is the purpose of the additional number on the handle of some instruments?

    <p>To assist in cataloging and ordering</p> Signup and view all the answers

    What is the term used to describe instruments with two bevels that form the cutting edge?

    <p>Bi-beveled instruments</p> Signup and view all the answers

    What is the direction in which the primary cutting edge angle is measured in an instrument formula?

    <p>Clockwise centigrade</p> Signup and view all the answers

    What does the angle in the instrument code represent?

    <p>The angle of the blade relative to the handle</p> Signup and view all the answers

    What is the unit of measurement for the blade length in the instrument code?

    <p>Millimeters</p> Signup and view all the answers

    What is the purpose of chisels in instrument application?

    <p>Cutting enamel</p> Signup and view all the answers

    Which type of excavator is used for refinement of internal parts of the preparation?

    <p>Spoon excavators</p> Signup and view all the answers

    What is the purpose of angle-formers in instrument application?

    <p>Forming angles in the tooth preparation</p> Signup and view all the answers

    What is the characteristic of a bin-angle chisel?

    <p>It has a bin-angle shape</p> Signup and view all the answers

    What is the purpose of enamel hatchets in instrument application?

    <p>Cutting enamel</p> Signup and view all the answers

    What is the purpose of gingival margin trimmers in instrument application?

    <p>Trimming the gingival margin</p> Signup and view all the answers

    What is the primary purpose of the shank in a hand instrument?

    <p>To connect the handle to the working end</p> Signup and view all the answers

    What is a characteristic of a handle in a hand instrument?

    <p>It is small in diameter (5.5 mm) and light in weight</p> Signup and view all the answers

    What type of cutting instrument uses electric or compressed air power?

    <p>Rotary cutting instrument</p> Signup and view all the answers

    What is the name of the instrument that is used for diagnosis?

    <p>Mirror</p> Signup and view all the answers

    What is the term for the cutting edge of a hand instrument?

    <p>Blade</p> Signup and view all the answers

    What is the purpose of the eight-sided or knurled handle?

    <p>To facilitate control</p> Signup and view all the answers

    What is the term for the type of instrument that is used for manipulation, packing, or condensation and shaping of restorative materials?

    <p>Restorative instrument</p> Signup and view all the answers

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