Unit 3 Flashcards
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?
Large-diameter handle with raised texturing
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 _____.
a complex shank design
A complex shank with long functional length is designed for posterior teeth. Extended lower shanks are ideal for supragingival use on anterior teeth.
The first statement is true; the second statement is false.
A cross section of a curet is _____ by design.
semicircular
A cross section of an explorer is _____ by design.
circular
A cross section of a sickle is _____ by design.
triangular
An instrument is identified as a Gracey 11/12. The Gracey in the name indicates the _____.
name of the individual who originally designed the instrument
An instrument that is flipped during patient treatment so the clinician can use the other end is a _____.
double-ended instrument
Another name for the lower shank is the ____
terminal shank
Instruments that are designed to remove calculus from crowns and roots of teeth are called ___
curets
Instruments with flexible shanks are designed to ______.
enhance the tactile sensitivity for the clinician
Tactile sensitivity is ____
the clinician’s ability to feel things through the instrument shank and handle
Which of the following is an example of an assessment instrument?
Explorer
Flying off the tooth at the end of a stroke is caused by _____.
not using enough pressure on the fulcrum finger
In periodontal instrumentation the fulcrum finger acts as the _______.
pivot that supports the hand
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.
Both statements are false
“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.
Both statements are false.
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.
The first statement is true; the second statement is false.
Wrist-rocking motion activation is a movement that is similar to _____.
turning a doorknob
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.
Both statements are true
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.
The first statement is false; the second statement is true.
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.
Both statements are true.
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?
Adapting the middle-third of the working-end to the tooth
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.
The first statement is true; the second statement is false.
Horizontal instrumentation strokes are most useful ___________.
When working around the line angles of posterior teeth
