Operative Dentistry Instruments Overview
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Questions and Answers

What is the primary use of the Ordinary Hatchet in dental procedures?

  • Planning tooth preparation walls
  • Forming line angles in Class III cavities
  • Creating grooves in enamel
  • Preparing retentive areas and sharpening internal line angles (correct)

    • Which cutting instrument has a cutting edge that is perpendicular to the axis of the handle?

  • Angle Former
  • Ordinary Hatchet
  • Hoe (correct)
  • Spoon

    • What is a common characteristic of the Angle Former?

  • Designated for creating retentive features and defining line angles (correct)
  • Used primarily for Class II cavity preparations
  • Identified by its straight cutting edge along the handle axis
  • Used for flat tooth surfaces only

    • Which cutting instrument subdivision is used primarily on anterior teeth?

    <p>Ordinary Hatchet</p> Signup and view all the answers

    How are dental instruments commonly classified?

    <p>Based on function, manner of use, or design of working end</p> Signup and view all the answers

    What is the primary function of a spoon excavator?

    <p>Carving amalgam or direct wax patterns</p> Signup and view all the answers

    How is the blade width of a straight chisel expressed?

    <p>In tenths of a millimeter</p> Signup and view all the answers

    What type of chisel is described as having a bevel on only one side?

    <p>Straight Chisel</p> Signup and view all the answers

    Which instrument is used primarily for cutting enamel?

    <p>Enamel Hatchet</p> Signup and view all the answers

    Which type of chisels is characterized by having a straight shank and a primary edge that is perpendicular to the handle axis?

    <p>Straight Chisel</p> Signup and view all the answers

    What is a distinguishing characteristic of the cleoid edge on the spoon excavator?

    <p>It is claw-like</p> Signup and view all the answers

    Which of the following tools is a combination of a gingival trimmer and a chisel?

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

    What does the first number in a four-number code for chisels represent?

    <p>Width of the blade in tenths of a millimeter</p> Signup and view all the answers

    What is the primary purpose of a gingival margin trimmer?

    <p>To bevel the gingival enamel margins properly</p> Signup and view all the answers

    Which of the following is NOT a result of using dull hand-cutting instruments?

    <p>Increased precision in tooth preparation</p> Signup and view all the answers

    What type of sharpening stone is preferred for fine sharpening of dental instruments?

    <p>Fine grit stones</p> Signup and view all the answers

    Which material is preferred for fine sharpening stones due to its properties?

    <p>Arkansas stone</p> Signup and view all the answers

    When using a stationary sharpening stone, what technique helps prevent rolling and dipping of the instrument?

    <p>Utilizing a finger rest</p> Signup and view all the answers

    What feature distinguishes mechanical sharpeners from stationary sharpening stones?

    <p>They automate the sharpening process</p> Signup and view all the answers

    Why is it important to use light strokes when sharpening instruments?

    <p>To avoid over-heating the stone</p> Signup and view all the answers

    Which of the following properties applies to silicone carbide as a sharpening material?

    <p>It is widely used as an industrial abrasive</p> Signup and view all the answers

    Which sterilization method is effective in preventing rust and corrosion of carbon steel instruments?

    <p>Dry Heat</p> Signup and view all the answers

    What is the consequence of using dull diamond burs during dental procedures?

    <p>Heat production</p> Signup and view all the answers

    Which method helps to minimize discoloration and corrosion in sterilizing instruments?

    <p>Prompt removal of instruments</p> Signup and view all the answers

    What is a purpose of using cylindrical fissure burs in dental procedures?

    <p>Retentive area refinement</p> Signup and view all the answers

    Which option is NOT a consideration in evaluating pulpal reaction?

    <p>Color of amalgam used</p> Signup and view all the answers

    What is the function of a plain steel bur used under low speed?

    <p>To cut hard tissues</p> Signup and view all the answers

    What can happen to the hardness of the alloy when using high heat sterilization?

    <p>Reduction in cutting edge retention</p> Signup and view all the answers

    Which cutting instruments are recommended for retentive area placement?

    <p>Inverted cone burs</p> Signup and view all the answers

    What is a key characteristic of diamond burs when cutting?

    <p>Do not leave a smooth surface at the cutting interface</p> Signup and view all the answers

    What method is used to control frictional heat during cutting?

    <p>Intermittent cutting with coolant use</p> Signup and view all the answers

    Which coolant is most popular among those mentioned?

    <p>Air-water spray</p> Signup and view all the answers

    What happens to pressure when the speed increases during cutting?

    <p>Pressure significantly decreases</p> Signup and view all the answers

    What is a disadvantage of using warm water as a coolant?

    <p>Visibility can be hampered and removal is needed</p> Signup and view all the answers

    What role does air coolant play during cutting?

    <p>Decreases visibility during procedures</p> Signup and view all the answers

    Which tapered bur is known to leave a rough surface?

    <p>Tapered Crosscut Fissure</p> Signup and view all the answers

    What effect does cutting at high speed have on heat production?

    <p>Decreases heat production</p> Signup and view all the answers

    What is the primary function of the head of a dental bur?

    <p>To perform desired shaping of tooth structure</p> Signup and view all the answers

    Which characteristic of a dental bur shank helps in maintaining alignment during operation?

    <p>It provides a bearing surface to control alignment</p> Signup and view all the answers

    What advantage does the combination of air and water spray provide during dental procedures?

    <p>It improves visibility and reduces water usage</p> Signup and view all the answers

    Which of the following is NOT an advantage of using rotary cutting instruments?

    <p>Improved pulp response to irritation</p> Signup and view all the answers

    What does the bur classification system refer to with respect to dental burs?

    <p>The shape and size of the bur head</p> Signup and view all the answers

    How does the proximity of the causative agents affect the pulp response during dental procedures?

    <p>Proximity influences the severity of the injury response</p> Signup and view all the answers

    Which shape is NOT one of the basic head shapes of dental burs?

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

    What type of application is recommended to minimize trauma during cavity preparation?

    <p>Light intermittent application</p> Signup and view all the answers

    Study Notes

    Operative Dentistry Instruments

    • Operative instruments are highly specialized tools used during dental procedures.
    • Categories include: operative, prophylaxis, and general surgical instruments.

    Cutting Instruments

    • Hand-cutting instruments:
      • Hatchets
      • Chisels
      • Hoes
      • Excavators
    • Rotary-cutting instruments:
      • Burs
      • Stones
      • Discs

    Condensing Instruments

    • Hand condensers
    • Mechanical condensers

    Plastic Instruments

    • Spatulas
    • Carvers
    • Cement carriers
    • Burnishers

    Finishing and Polishing Instruments

    • Rotary: Finishing burs, mounted brushes, rubber cups, impregnated disks, and wheels
    • Hand: Finishing strips, polishing points, orangewood sticks

    Isolation Instruments

    • Rubber dam frame
    • Clamps
    • Forceps
    • Punch
    • Saliva ejector
    • Cotton roll holders
    • Evacuation tips & equipment

    Miscellaneous Instruments

    • Mouth mirrors
    • Explorers
    • Probes
    • Scissors
    • Pliers
    • Lubricant

    Hand Cutting Instrument Design

    • Blade/Nib: Functional end of the instrument (point or head)
    • Handle (Shaft): Connects the blade to the shank. Early models were large and heavy, while modern ones are smaller and lighter.
    • Shank: Connects the handle to the working end, the purpose of the shank is to balance the instrument. This is accomplished by adjusting the angulation of the shank so the cutting edge of the blade does not deviate from the axis more than 1-2 mm.

    Cutting Instrument Bevels

    • Excavator:

      • Ordinary Hatchets
      • Hoes
      • Angle forcer
      • Spoons

    • Chisels:

      • Straight
      • Slightly Curved
      • Enamel Hatchets
      • Gingival margin trimmers
      • Bin angle

    • Instrument Names: Classifications are based on function, manner of use, and working end design.

    • Examples: Scalers, excavators, spoon excavators, sickle scaler.

    Sharpening Instruments

    • Stationary Stones (Oilstones): Coarse, medium, and fine grit stones used for sharpening.
    • Mechanical Sharpener: Honing machine that uses reciprocating motion with interchangeable honing tools.

    Principles of Sharpening

    • Clean and sterilize the instrument before sharpening.
    • Establish the correct bevel angle.
    • Apply light pressure to the stone.
    • Minimize metal removal.
    • Lightly hone the unexposed side of the blade.
    • Resterilize the instrument.

    Rotary Equipment

    • Handpieces: Hold rotary instruments, power them, and position them intraorally. Categorized by speed: low, medium, and high/ultra.

    Classification of Dental Burs

    • Steel, Tungsten carbide, and Diamond: Differ in durability and efficiency at various speeds. Categorized by shape (round, inverted cone, straight, tapered).

    Pulp Reaction to Rotary Cutting Instruments

    • Heat generation during cutting may lead to pulp irritation.
    • Instruments should be applied with care to minimize heat.
    • Pulp response can be classified as mild irritation or severe injury.

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    Operative Dentistry Instruments PDF

    Description

    This quiz covers the various types of operative dentistry instruments used in dental procedures. It includes categories such as cutting instruments, condensing instruments, plastic instruments, finishing and polishing instruments, isolation instruments, and miscellaneous tools. Test your knowledge on these essential dental tools!

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