MCQs on Hand Instruments and Instrumentation - Conservative Dentistry and Endodontics

# Which of the following is not true about hand instruments used in operative dentistry?
A. They are generally made of stainless steel
B. Nickel-cobalt-chromium is never used in its fabrication
C. Carbon steel is more efficient than stainless steel
D. It can be made with stainless steel with carbide inserts

# Most of the hand cutting instruments are made up of:
A. Chromium cobalt
B. Carbon steel
C. Tungsten carbide
D. Stainless steel



# Many instruments are identified by the numbering system placed on the handle. First number indicates:
A. Width of blade in mm
B. Width of blade in 1/10th of mm
C. Length of the blade in cm
D. Width of the cutting edge

# Which of the following instruments will have a four-number formula?
A. Ordinary hatchet
B. GMT
C. Jeffery hatchet
D. All of the above

# Four numbered instrument formula other than GMT is:
A. Chisel
B. Hoe
C. Angle former
D. Hatchet

# Instrument which forms a blade angle of more than 125 is likely to be:
A. Biangle chisel
B. Curette
C. Chisel
D. Angle former

# The angle former is a special type of:
A. Chisel
B. Excavator
C. Hatchet
D. Rotary instrument

# Instrument used to plane buccoproximal and linguoproximal walls in class II cavity is:
A. Enamel hatchet
B. Bibevelled hatchet
C. Chisel
D. Single sided chisel

# To remove remaining undermining enamel in class II cavity instrument used is:
A. Enamel hatchet
B. GMT
C. Tip of the probe
D. Ordinary hatchet

# __________ is used to prepare retentive points in dentin in class 3 and 5 on anterior teeth.
A. Angle former
B. Hoe
C. Ordinary hatchet
D. GMT

# Instruments are angled:
A. To increase efficiency
B. For proper balance
C. For proper distribution of the forces
D. All of the above

# For the balance of hand cutting instruments:
A. Cutting edges of the working end should be centered over the long axis of the angle
B. The cutting edge centered on a line running at right angle to the long axis of the handle
C. It should have shorter, straighter shank
D. It should have solid handle

# In contra angled instruments one of the shanks should be placed within ________ mm from the axis of the handle.
A. 2 mm
B. 3 mm
C. 5 mm
D. 6 mm

# A four-digit numbered instrument you would like to use in the distoproximal surface of the lower posterior teeth (
A. Second number in the instrument formula is greater than 90 degrees
B. Second number in the instrument formula is less than 90 degrees
C. Third number in the formula is below ten
D. The fourth number in the instrument formula is less than five

# The type of chisel with the shank and blade slightly curved is:
A. Straight chisel
B. Wedelsaedt chisel
C. Enamel hatchet
D. GMT

# Cutting instruments should be thoroughly sharpened:
A. To reduce pain
B. To effectively control the instrument
C. To create smooth surface wall
D. All of the above

# Stones mounted on a rotating instrument are used to sharpen:
A. Excavator
B. Hatchets
C. Hoes
D. Chisels

# Which one of the following operative instruments is sharpened with handpiece stones?
A. Enamel hatchets
B. Binangle chisels
C. Curved chisels
D. Spoon excavators

# Honing machine is used for:
A. CAD CAM inlay fabrication
B. Polishing restorations
C. Mechanical sharpening of instruments
D. Caries detection

# In dental burs, the angle formed between the back of the blade and the tooth surface is called:
A. Clearance angle
B. Rake angle
C. Cavosurface angle
D. Point angle

# Most of the routinely used burs in conservative dentistry have:
A. Positive rake
B. Negative rake
C. Neutral rake
D. None of the above

# Rake angle for burs is negative:
A. If rake face is ahead of radius
B. If rake face is in line with radius
C. If rake face is behind radius
D. No answer is correct

# As far as the rise of frictional heat, in using various rotary cutting instruments is concerned, which one of the following is the most kind to the pulp?
A. Stainles steel bur
B. Diamond bur
C. Carbide bur
D. Carbon steel bur

# A major factor determining the efficiency of bur is:
A. Taper angle
B. Spiral angle
C. Head length
D. Head diameter

# Efficiency of carbide bur increases by:
A. Negative or zero rake angle
B. 90 degree edge angle
C. At high speed
D. All of the above

# Which of the following burs is used for gross finishing?
A. Stainless steel bur
B. Carbide bur 12 fluted
C. Fine grit diamond bur
D. Carbide bur 16 fluted

# Which of the following burs is used for cavity preparation in pedodontics practice?
A. Doughnut bur
B. Pear shaped bur
C. Wheel bur
D. Round bur

# Cutting and grinding procedures are predominantly:

A. Two directional
B. Unidirectional
C. Three directional
D. Multidirectional

# Which of the following about grinding and cutting used in dentistry is not correct?
A. Grinding and cutting works unidirectionally
B. Carbide works by cutting and diamond by grinding
C. 16 fluted carbide causes maximum cutting and produces a coarse surface
D. None of the above

# The term 'Run-out' measures the:
A. Rake angle
B. Symmetricity of the bur head
C. Clearance angle
D. Edge angle

# The limit of eccentricity of air rotor bur is:
A. 0.01
B. 0.02
C. 0.03
D. 0.04

# For most effective cutting and long usefulness of a tungsten carbide bur, it should be:
A. Rotating slowly before contacting the tooth
B. Rotating rapidly before contacting the tooth
C. Placed in contact with tooth before starting
D. Rotating rapidly before entering into the oral cavity

# Greater the number of cutting blades on a rotary instrument:
A. Greater the cutting efficiency and smoother the surface
B. Lesser the cutting efficiency and smoother the surface
C. Greater the cutting efficiency and rougher the surface
D. Lesser the cutting efficiency and rougher the surface

# On a carbide bur, increase in a great number of cutting blades results in:
A. Less efficient cutting and a smoother surface
B. Less efficient cutting and a rougher surface
C. More efficient cutting and smoother surface
D. More efficient cutting and a rougher surface

# The hard carious dentin is removed with:
A. Excavator
B. Bur at low speed
C. Bur at high speed
D. None of the above

# The bur used to penetrate porcelain fused metal restoration is:
A. Mueller bur
B. Transmetal bur
C. Safety tip tapered diamond bur
D. LN bur

# Which of the following burs have ability to stop cutting when they reach the affected dentin?
A. Smart burs
B. Easy burs
C. Laser burs
D. Carbide burs

# Which of the following burs produce a smooth finish?
A. 8 fluted
B. 12 fluted
C. 16 fluted
D. 24 fluted