Question 1

Which of the following is a part of an instrument?

Accepted Answer

All of the options (A, B, and C) are parts of an instrument. The handle is the part of the instrument that the operator uses to hold and control the instrument, the shank is the part that connects the handle to the working end, and the working end is the part that comes into contact with the tooth or tissue being treated.

Question 2

On a three-number enamel cutting instrument, the first number indicates

Accepted Answer

The first number on a three-number enamel cutting instrument typically indicates the width of the blade in tenths of millimeters.

Option A is incorrect because the angle of the blade from the long axis of the shaft is typically indicated by the second number.

Option C is incorrect because the length of the blade is typically indicated by the third number.

Option D is incorrect because the angle of the cutting edge of the blade in relation to the handle is not typically indicated on a three-number enamel cutting instrument.

Question 3

Which instrument is used to plane and cleave enamel in a cavity preparation, is used with a push motion, and has two angles for the cutting edges?

Accepted Answer

The binangle chisel is designed with two angles for the cutting edges, allowing it to plane and cleave enamel effectively in cavity preparation using a push motion.

Question 4

On a three-number enamel cutting instrument, the third number indicates

Accepted Answer

The third number in a three-number enamel cutting instrument indicates the angle of the blade from the long axis of the shaft in centigrade.

Question 5

On a three-number enamel cutting instrument, the second number indicates

Accepted Answer

In a three-number enamel cutting instrument, the second number represents the length of the blade in millimeters.

Question 6

Which instrument (or instruments) is used to plane and cleave enamel?

Accepted Answer

A straight chisel is used to plane and cleave enamel.

Question 7

Which enamel cutting instrument is used in a pull motion?

Accepted Answer

The enamel hoe is designed to be used in a pull motion to cut enamel.

Question 8

Indicate which enamel cutting instrument is used to remove decay from the cavity preparation.

Accepted Answer

Spoon excavator is the best choice for removing decay from the cavity preparation as it has a rounded scoop-like tip that is ideal for scooping out soft decayed dentin and debris without damaging the healthy enamel walls of the cavity. Enamel hatchet, hoe, Wedelstaedt chisel, and Binangle chisel are used for smoothing and shaping the cavity walls, but not for removing decay.

Question 9

If a 15-8-14 enamel hatchet is utilized in a dental procedure, what is the length of the blade of the instrument?

Accepted Answer

The second number in the 15-8-14 formula represents the length of the blade in millimeters, which is 8 mm.

Question 10

Which instrument is used to plane and cleave enamel and to form or accentuate line angles in a cavity preparation, is used with a pulling motion, and has a cutting edge or blade that is almost perpendicular to the handle?

Accepted Answer

The enamel hoe is used with a pulling motion to plane and cleave enamel and to form or accentuate line angles in a cavity preparation. Its cutting edge is almost perpendicular to the handle.

Question 11

Which of the following characteristics describe both the enamel hatchet and enamel hoe?

Accepted Answer

The answer of Which of the following characteristics describe both...

Question 12

Which of the following hand instruments is an example of a four-number instrument?

Accepted Answer

A distal gingival margin trimmer is a four-number instrument, where the numbers indicate the width of the blade, the angle of the cutting edge, the length of the blade, and the angle of the blade to the handle.

Question 13

Which instrument is used to plane and cleave enamel in a cavity preparation, is used with a push motion, has one angle for the cutting edge, and has a curved blade?

Accepted Answer

The Wedelstaedt chisel is designed for planing and cleaving enamel with a push motion, has a single angle for the cutting edge, and features a curved blade.

Question 14

The instrument used to remove carious dentin in a cavity preparation is a(n)

Accepted Answer

A spoon excavator is specifically designed for the removal of carious dentin from the cavity preparation. The hatchet and hoe are used for initial rough trimming of teeth and removal of unsupported enamel, while the angle former is used for creating proper angles in cavity preparations. The gingival margin trimmer is used to refine and smooth the gingival margins of cavity preparations.

Question 15

An angle former enamel cutting instrument would be found on which instrument tray setup?

Accepted Answer

An angle former enamel cutting instrument is typically used in restorative dentistry to shape and refine cavity preparations, making it part of a restorative tray setup.

Question 16

On a four-number enamel cutting instrument, the third number indicates

Accepted Answer

The third number in a four-number enamel cutting instrument indicates the length of the blade in millimeters.

Question 17

Used on restorative tray setups, the main function of a spoon excavator is:

Accepted Answer

The main function of a spoon excavator is to remove carious dentin, which is decayed or soft dentin that needs to be removed before placing a filling or restoration. It can also be used to remove portions of a tooth affected by caries before shaping or filling the tooth. It is not used to remove temporary crowns, temporary cement, or permanent crowns during try-in.

Question 18

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)

Accepted Answer

The mesial or distal gingival margin trimmer is specifically designed to bevel the cervical walls of the mesial and/or distal retention areas. The other instruments listed (hatchet, hoe, spoon excavator, angle former) are not designed for this specific purpose.

Question 19

The enamel cutting instrument used to accentuate line and point angles in internal outline and retention in a cavity preparation is a(n)

Accepted Answer

The angle former is specifically designed to accentuate line and point angles in cavity preparations, making it suitable for creating internal outline and retention features.

Quiz 2: Enamel Cutting Instruments