Unit 13

Question 1

A closed angle is one in which the face-to-tooth surface angulation is between _____

Answer 1

0 and 40 degrees

Question 2

For successful instrumentation, correct angulation of the working-end must be maintained throughout the instrumentation stroke. Incorrect angulation can result in a burnished calculus deposit.

Answer 2

Both statements are true.

Question 3

In preparation for inserting the working-end beneath the gingival margin on the facial aspect of a molar tooth, the clinician should do which of the following?

Answer 3

Lower the hand and the instrument handle until the curet toe is pointing toward the gingival margin

Question 4

Positioning the first 1 to 2 mm of the working-end’s lateral surface in contact with the tooth” is a definition for which of the following?

Answer 4

Adaptation

Question 5

Removing subgingival calculus deposits is a challenging task since the clinician cannot see the deposits hidden beneath the gingival margin. Instrumentation zones are used to divide the root surface into a series of narrow tracts.

Answer 5

Both statements are true

Question 6

The correct face-to-root surface angulation for root debridement is:

Answer 6

60 to 70 degrees

Question 7

The objective of periodontal instrumentation is removal of calculus deposits and microorganisms. Residual calculus is not a problem for healing tissues

Answer 7

The first statement is true; the second statement is false.

Question 8

The purpose of establishing the proper degree of angulation with the instrument against the tooth, is that if the angulation is incorrect _____.

Answer 8

all of the choices are correct

Question 9

“The relationship between the face of a calculus removal instrument and the tooth surface to which it is applied” is a definition for which of the following?

Answer 9

Angulation

Question 10

The true measure of successful subgingival instrumentation is the complete removal of all calculus deposits. Periodontal health means tissues that are healed and free of inflammation.

Answer 10

The first statement is false; the second statement is true.

Question 11

To select the correct working-end for use on the distal surface of a molar tooth, the clinician should do which of the following?

Answer 11

Observe the relationship between the distal surface of the molar and the lower shank of the instrument; the lower shank should be parallel to the distal surface.

Question 12

When working beneath the gingival margin in a sulcus or pocket, a face-to-tooth surface angulation of 95 degrees would most likely result in _____.

Answer 12

tissue trauma

Question 13

Which of the following correctly describes the type of lateral pressure used with a calculus removal stroke?

Answer 13

Moderate pressure to snap deposit from the tooth

Question 14

Which of the following statements about angulation is true?

Answer 14

The face-to-tooth surface angulation for calculus removal is between 60 and 80 degrees

Question 15

A universal curet with a shorter lower shank length would be a good choice for the removal of:

Answer 15

Deposits in shallow pockets

Deposits in normal sulci

Question 16

During a calculus removal stroke with a universal curet, you can stabilize your stroke by:

Answer 16

Applying pressure with the index finger and thumb inward against the instrument handle

Question 17

Greg wants to remove a medium-sized calculus deposit located approximately 5 mm below the gingival margin. Greg’s efforts will be most successful if he selects a universal curet with which of the following design characteristics?

Answer 17

Long lower shank length

Question 18

How can you determine the correct working-end of the universal curet on a posterior tooth?

Answer 18

The lower shank is parallel to the distal surface

The outer cutting edges are farther from the instrument handle

The correct end does not show as much face when placed against the tooth surface

Question 19

Isabella is examining the working-end of a periodontal instrument. The instrument has a rounded toe, rounded back, and two cutting edges per working-end. What design classification is this instrument?

Answer 19

Universal curet

Question 20

Janel wants to remove a large ledge of supragingival calculus. Which of the following instruments would be her best choice?

Answer 20

Sickle scaler

Question 21

Malcolm is having difficulty removing a subgingival calculus deposit on the line angle region of a molar tooth with a universal curet. Which of the following techniques should be effective in removing the calculus deposit?

Answer 21

Use a horizontal stroke

Question 22

Shino wants to select the correct working-end of a double-ended universal curet for an anterior tooth. What visual clue should she look for to select the correct end?

Answer 22

Lower shank goes across the tooth surface

Question 23

Which of the following are design characteristics of a universal curet?
1) Face is perpendicular to the lower shank
2) Face off set at 70 to 80 degrees to lower shank
3) One cutting edge per working-end
4) Two cutting edges per working-end

Answer 23

1 and 4

Question 24

Which of the following correctly describes the character of the instrumentation strokes used for calculus removal with a universal curet?

Answer 24

A short biting stroke

Question 25

While working on the facial surface of a molar, you notice that the terminal shank is “down and around” the tooth. What should you do in this situation?

Answer 25

Flip the instrument and use the other end