Unit 3

Question 1

A clinician is experiencing muscle strain in his fingers and wrist. Which of the following would be most likely to reduce strain to the clinician’s fingers and wrist?

Answer 1

Large-diameter handle with raised texturing

Question 2

A clinician is holding an instrument so that the tip of working-end is facing him. With the instrument in this position, the functional shank is bent from side to side. The clinician’s instrument has _____.

Answer 2

a complex shank design

Question 3

A complex shank with long functional length is designed for posterior teeth. Extended lower shanks are ideal for supragingival use on anterior teeth.

Answer 3

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

Question 4

A cross section of a curet is _____ by design.

Answer 4

semicircular

Question 5

A cross section of an explorer is _____ by design.

Answer 5

circular

Question 6

A cross section of a sickle is _____ by design.

Answer 6

triangular

Question 7

An instrument is identified as a Gracey 11/12. The Gracey in the name indicates the _____.

Answer 7

name of the individual who originally designed the instrument

Question 8

An instrument that is flipped during patient treatment so the clinician can use the other end is a _____.

Answer 8

double-ended instrument

Question 9

Another name for the lower shank is the ____

Answer 9

terminal shank

Question 10

Instruments that are designed to remove calculus from crowns and roots of teeth are called ___

Answer 10

curets

Question 11

Instruments with flexible shanks are designed to ______.

Answer 11

enhance the tactile sensitivity for the clinician

Question 12

Tactile sensitivity is ____

Answer 12

the clinician’s ability to feel things through the instrument shank and handle

Question 13

Which of the following is an example of an assessment instrument?

Answer 13

Explorer

Question 14

Flying off the tooth at the end of a stroke is caused by _____.

Answer 14

not using enough pressure on the fulcrum finger

Question 15

In periodontal instrumentation the fulcrum finger acts as the _______.

Answer 15

pivot that supports the hand

Question 16

Instrumentation strokes are usually large movements to cover as much of the tooth surface as possible. During motion activation for calculus removal, it is best to keep the ring finger (fulcrum finger) in a curved, relaxed position.

Answer 16

Both statements are false

Question 17

“Muscle memory” is stored in your finger muscles when you practice instrumentation frequently. During the imitating stage of psychomotor skill development the learner should have smooth instrument motions.

Answer 17

Both statements are false.

Question 18

Rolling the instrument handle between the thumb and the index finger aids the clinician in maintaining adaptation of the working-end to the tooth surface. It is easier to roll the instrument handle if the thumb and index finger are overlapped on the handle.

Answer 18

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

Question 19

Wrist-rocking motion activation is a movement that is similar to _____.

Answer 19

turning a doorknob

Question 20

A collapsed finger position with hyperextended joints causes fingertips to lift off of the handle. Neutral joint position in the grasp can reduce hand stress during instrumentation.

Answer 20

Both statements are true

Question 21

A functional shank “down and around” the tooth indicates you have selected the correct working-end. Maintain your finger rest as you place a working-end on a distal tooth surface and look for visual clues.

Answer 21

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

Question 22

For successful instrumentation, correct adaptation of the working-end must be maintained throughout the instrumentation stroke. Incorrect adaptation can result in injury to gingival tissue.

Answer 22

Both statements are true.

Question 23

James is removing calculus deposits located above the gingival margin of a mandibular anterior tooth. As he works around the tooth, his instrument cuts the soft tissue of the gingiva. Which of the following is the most likely cause of the tissue trauma?

Answer 23

Adapting the middle-third of the working-end to the tooth

Question 24

The leading-third is the portion of the working-end that should be kept in contact with the tooth surface during instrumentation. On a curet, the leading-third is termed the tip-third of the working-end.

Answer 24

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

Question 25

Horizontal instrumentation strokes are most useful ___________.

Answer 25

When working around the line angles of posterior teeth