Instruments In Operative Dentistry Short Question and Answers

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Instruments Short Answers

Instruments In Operative Dentistry.

Question 1. Slow speed.

Answer:

Range:

  • 5002500 rpm

Bur Used:

  • Steel bur

Uses:

  • Polishing
  • Finishing
  • Drilling holes
  • Implants
  • Excavation of caries

Advantages:

  • Good tactile sense

Disadvantages:

  • Inefficient
  • Operator fatigue
  • Patient discomfort

Question 2. 245 bur.

Answer:

  • It is nonstandard carbide bur
  • Designed to combine rounded corners with flat ends
  • ADA size number 330L
  • ISO size number 008
  • Head diameter 0.80 mm
  • Head length 3 mm
  • Shape pear, elongated

Question 3. Enamel Hatchet.

Answer:

  • Paired instrument
  • Blade angle 4590°
  • Bevel Unibevel/Bibeveled

Conservative And Operative Dentistry Instruments Hatchet

Use:

  • Unibevelled instrument
  • Cleaving of enamel
  • Planning of dentinal walls

1. Bibevelled:

  • Use in a chopping motion
  • Refine line and point angle

Question 4. AngleFormer.

Answer:

  • Type of excavator, mono-angled instrument
  • Cutting edge angle 8085°
  • Paired instrument
  • Blade Beveled on sides as well as at the end
  • Manner of using Push or pull motion
  • Use Establish retention form in DFG restoration
  • Planning the gingival cavosurface margin

Question 5. High Speed.

Answer:

  • Speed 20,000 1,20,000 RPM
  • Burs used diamond burs with lubricant

Uses:

  • Tooth preparation
  • Refining tooth preparation
  • Refining occlusion

Advantages:

  • Fine tactile sense
  • Minimum over cutting

Disadvantages:

  • Heat production
  • Not fit for larger preparation
  • Operator fatigue

Question 6. Dental Bur.

Answer:

Definition:

It is defined as a rotary cutting instrument with cutting heads of various shapes and two or more sharp-edged blades, used as a rotary grinder

Classification:

1. According to their mode of attachment to handpiece

  • Latch type
  • Friction grip type

2. According to their composition

  • Stainless steel
  • Tungsten carbide
  • Combination

3. According to their motion

  • Right bur Revolves clockwise
  • Left bur Revolves anticlockwise

4. According to the length of their head

  • Long
  • Short
  • Regular

5. According to their use

  • Cutting burs
  • For finishing and polishing

6. According to their shapes

  • Round
  • Pear shaped
  • Inverted cone
  • Wheel shaped
  • Tapering fissure
  • Straight fissure

Question 7. Grasps are used with Hand Instruments.

Answer:

1. Modified Pen Grasp:

  • Middle finger pad placed over shank
  • Index finger Bend over middle phalanges and placed over the middle finger
  • Thumb Placed on the opposite side of the instrument

Advantages:

  • Creates tripod effect
  • Enhances instrument control stabilizers instru¬ment

Uses:

  • Commonly used in mandibular teeth

2. Inverted Pen Grasp:

  • Similar to a modified pen grasp
  • Palm faces toward the operator

Uses:

  • Lingual surface of maxillary anterior
  • Occlusal surface of maxillary posteriors

3. Palm and thumb grasp:

  • The shaft placed on the palm of the hand and grasped by four fingers
  • The thumb is free to control movements

Use:

  • Holding handpiece
  • Cutting incisal retention for Class 3

4. Modified Palm and Thumb Grasp:

  • Provides more control to avoid slipping of instrument
  • Used for maxillary anterior

Question 8. Speed in operative Density

Answer:

Conservative And Operative Dentistry Instruments Speed in operative density

Question 9. Rake angle.

Answer:

  • It is the angle between the rake face and the radial line
    • Positive Rake Angle Radial line is ahead of rake face
    • Negative Rake Angle Rake face is ahead of radial line
    • Zero Rake Angle Rake face and radial line coincide

Conservative And Operative Dentistry Instruments Three types of rake angles

Question 10. Wedel Staedt Chisel.

Answer:

  • Have slightly curved shanks
  • Used on anterior teeth
  • It is a single plane, unibevel instrument
  • Used for cleaving undermined enamel

Conservative And Operative Dentistry Instruments Wedelestaedt chisel

Question 11. Balancing of Hand Instrument.

Answer:

  • Balancing is achieved by providing angles in the shank of the instrument so that the cutting edge is within 23 mm of the long axis of the instrument
  • It provides better access
  • It is also called contra angling

Conservative And Operative Dentistry Instruments Blacing of an instrument

Question 12. Spoon Excavator.

Answer:

  • It is a modified hatchet
  • Double ended instrument
  • BladeSpoon, claw or disk-shaped
  • Use Removal of caries and debris
  • Manner of use Scooping motion

Question 13. Advantages and Disadvantages of Burs.

Answer:

Advantages:

  • Precise
  • Easy to control
  • Tactile perception
  • Removal of debris

Disadvantages:

  • Pain
  • Vibration
  • Noise production
  • Pulpal damage
  • Over cutting

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