Chapter 02: Enamel Cutting Instruments
Boyd: Dental Instruments, 6th Edition
MULTIPLE CHOICE
1. On a three-number enamel cutting instrument, what does
... [Show More] the third number indicate?
a. Angle of the cutting edge of the blade in relation to the handle in millimeters
b. Angle of the blade from the long axis of the shaft in millimeters
c. Width of the blade in tenths of millimeters
d. Length of the blade in millimeters
ANS: B
On a three-number cutting instrument, the numbers on the handle indicate width, length, and
angle of the blade. The third number indicates the angle of the blade.
REF: Page 17 TOP: CDA, GC, II. Chairside Dental Procedures
2. On a four-number enamel cutting instrument, what does the third number indicate?
a. Angle of the cutting edge of the blade in relation to the handle in millimeters
b. Angle of the blade from the long axis of the shaft in millimeters
c. Width of the blade in tenths of millimeters
d. Length of the blade in millimeters
ANS: D
On a four-number instrument, the numbers represent the width of the blade, the angle of the
cutting edge, the length of the blade, and the angle of the blade. The third number indicates
the length of the blade in milNlimUeRteSrsI.NGTB.COM
REF: Page 19 TOP: CDA, GC, II. Chairside Dental Procedures
3. On a three-number enamel cutting instrument, what does the first number indicate?
a. Angle of the cutting edge of the blade in relation to the handle in millimeters
b. Angle of the blade from the long axis of the shaft in millimeters
c. Width of the blade in tenths of millimeters
d. Length of the blade in millimeters
ANS: C
On a three-number cutting instrument, the numbers on the handle indicate width, length, and
angle of the blade. The first number indicates the width of the blade in tenths of millimeters.
REF: Page 17 TOP: CDA, GC, II. Chairside Dental Procedures
4. On a three-number enamel cutting instrument, what does the second number indicate?
a. Angle of the cutting edge of the blade in relation to the handle in millimeters
b. Angle of the blade from the long axis of the shaft in millimeters
c. Width of the blade in tenths of millimeters
d. Length of the blade in millimeters
ANS: DDental Instruments 6th Edition Boyd Test Bank
On a three-number cutting instrument, the numbers on the handle indicate width, length, and
angle of the blade. The second number on the handle indicates the length of the blade in
millimeters.
REF: Page 17 TOP: CDA, GC, II. Chairside Dental Procedures
5. Which enamel cutting instrument is used to accentuate line and point angles in internal outline
and retention in a cavity preparation?
a. Hatchet
b. Angle former
c. Straight chisel
d. Binangle chisel
e. Gingival margin trimmer
ANS: B
The angle former is used to accentuate line and point angles in internal outline and retention
in a cavity preparation. The hatchet is used to clean and smooth cavity preparation walls. The
binangle chisel and straight chisel are used to plane and cleave enamel in a cavity preparation.
The gingival margin trimmer bevels the cervical walls of mesial and distal retention areas.
REF: Page 31 TOP: CDA, GC, II. Chairside Dental Procedures
6. The instrument used specifically to bevel the cervical walls (floor) of the mesial and/or distal
retention areas of the internal walls of a cavity preparation is a(n)
a. hoe.
b. hatchet.
c. angle former.
d. spoon excavator.
e. mesial or distal gingival margin trimmer.
ANS: E
The gingival margin trimmer bevels the cervical walls of mesial and distal retention areas. An
enamel hoe is used to clean and smooth the floor and walls. The hatchet is used to clean and
smooth cavity preparation walls.The angle former is used to accentuate line and point angles
in internal outline and retention in a cavity preparation. A spoon excavator is used to remove
caries.
REF: Page 33 TOP: CDA, GC, II. Chairside Dental Procedures
7. The instrument used to remove carious dentin in a cavity preparation is a(n)
a. hoe.
b. hatchet.
c. angle former.
d. spoon excavator.
e. mesial or distal gingival margin trimmer.
ANS: D [Show Less]