3021 Exam 1 Practice

Covers:

• Module 1: Ergonomic risks and musculoskeletal disorders

• Module 1, Part 2: Neutral clinician, patient, and equipment positioning

• Module 3: Modified pen grasp

• Module 4: Dental-mirror use

• Modules 5–7: Clock positions, finger rests, and setup sequence

• Module 8: Instrument design and classification

Part I: Fill in the Blank

1. The applied science concerned with fitting tools, tasks, and the work environment to the worker is called __________.

2. An injury that develops over time in muscles, tendons, or nerves is called a __________ disorder.

3. Positioning a joint near the middle of its full range of motion is called __________ posture.

4. A task is considered repetitive when the same fundamental movement occupies more than _____% of the work cycle.

5. Compression of the brachial nerve plexus and blood vessels can cause __________ outlet syndrome.

6. Compression of the median nerve by the pronator muscle causes __________ syndrome.

7. Compression of the median nerve at the wrist causes __________ tunnel syndrome.

8. Inflammation along the side of the wrist and base of the thumb following forceful gripping and hand twisting is called __________.

9. Periodontal instrumentation is considered a complex __________ skill because it combines mental processing and controlled movement.

10. A neutral neck position allows approximately _____ to _____ degrees of head tilt.

11. For mandibular treatment, the chair back should be raised approximately _____ to _____ degrees.

12. Maxillary treatment generally requires a __________-up patient head position.

13. The recommended grasp for holding a periodontal instrument is the __________ pen grasp.

14. In the modified pen grasp, one side of the middle-finger pad should rest lightly against the instrument’s __________.

15. The __________ finger acts as the hand’s support beam during periodontal instrumentation.

16. The dental mirror that produces the clearest undistorted image is the __________-surface mirror.

17. Directing reflected light through anterior teeth is called __________.

18. When instrumenting mandibular teeth, the clinician’s palm should generally face __________.

19. The force used to hold an instrument handle is called __________ force.

20. A shank that bends in two planes and is designed primarily for posterior teeth is called a __________ shank.

Part II: True or False

21. Dental equipment should fit the worker rather than forcing the worker to adapt to it.

22. A static posture involves maintaining a fixed position or grip for an extended period.

23. Pinch-gripping an instrument tightly is an ergonomically desirable technique.

24. Holding the elbow above waist level and the upper arm away from the body can contribute to rotator cuff tendinitis.

25. Repeated wrist bending and holding the little finger fully away from the hand can contribute to ulnar nerve entrapment.

26. A neutral hand position requires the palm to remain completely parallel to the floor.

27. Neutral seated posture includes flat feet and hips positioned slightly higher than the knees.

28. For mandibular treatment, the light should generally be positioned directly over the oral cavity.

29. Magnification loupes are required when a clinician first learns positioning, mirror use, and finger rests.

30. Overlapping the thumb and index finger makes it easier to roll an instrument.

31. The middle finger should rest on the instrument handle because its main function is to hold the instrument.

32. A split fulcrum creates a weaker grasp because the middle and ring fingers do not contact each other.

33. Gloves should fit tightly across the palm and wrist to improve muscular control.

34. Joint hypermobility may be associated with reduced proprioceptive sensitivity in the hand joints.

35. A plane or flat-surface mirror produces a clear, single image without distortion.

36. A concave mirror is recommended because its magnification never distorts the image.

37. Every dark shadow seen during transillumination must represent dental caries.

38. A right-handed clinician generally sits at 11:00–1:00 for anterior surfaces facing away.

39. After the first neutral-position check, the mirror is grasped and stabilized before the periodontal instrument.

40. A long functional shank is generally selected for subgingival instrumentation.

Part III: Multiple Choice

41. Which combination presents the greatest risk of musculoskeletal injury?

A. Neutral posture and frequent recovery
B. Repetition, force, awkward posture, and insufficient recovery
C. Relaxed gripping and properly positioned equipment
D. Occasional movement with recovery breaks

42. Which condition is associated with independently extending the fingers?

A. Thoracic outlet syndrome
B. Pronator syndrome
C. Extensor wad strain
D. Rotator cuff tendinitis

43. A clinician repeatedly extends her hand upward and downward at the wrist. Which condition is most closely associated with this movement?

A. Tendinitis
B. Tenosynovitis
C. Thoracic outlet syndrome
D. Extensor wad strain

44. Which seated position is most neutral?

A. Feet lifted and knees higher than hips
B. Feet flat, weight evenly distributed, and hips slightly above knees
C. One foot elevated and torso twisted
D. Feet flat with the shoulders raised toward the ears

45. Which setup is appropriate for maxillary treatment?

A. Chair raised 15–20° with the chin down
B. Chair nearly parallel to the floor with the chin up
C. Chair completely upright with the chin down
D. Chair nearly flat with the chin lower than the nose

46. Which setup is appropriate for mandibular treatment?

A. Chair back raised 15–20° with the chin down
B. Chair nearly flat with the chin up
C. Chair upright with the chin above the nose
D. Chair nearly flat with the nose and chin level

47. Which finger guides the working end and detects vibrations transmitted through the shank?

A. Index finger
B. Middle finger
C. Ring finger
D. Little finger

48. Which observation indicates that an instrument grasp is too tight?

A. The ring finger is straight
B. The thumb or index finger becomes blanched
C. The handle rests against the hand
D. The middle finger lightly contacts the shank

49. Which statement correctly describes the ring finger?

A. It primarily detects vibrations.
B. It has no function in the grasp.
C. It should remain straight and provide stability.
D. It should remain curved and loose.

50. Which glove fit is most appropriate?

A. Tight across the palm, wrist, and fingertips
B. Loose at the fingertips and tight at the wrist
C. Loose across the palm and wrist with a close fingertip fit
D. Extremely loose across the entire hand

51. Which dental mirror is most commonly used?

A. Concave mirror
B. Plane mirror
C. Front-surface mirror
D. Magnifying plane mirror

52. Which mirror function reflects light onto a tooth or tissue located in a dark area?

A. Retraction
B. Indirect vision
C. Indirect illumination
D. Transillumination

53. Which mirror function moves the cheek, lip, or tongue away from the treatment area?

A. Retraction
B. Transillumination
C. Indirect illumination
D. Instrument adaptation

54. A right-handed clinician is treating a posterior aspect facing away. Which clock position is recommended?

A. 8:00–9:00
B. 9:00
C. 10:00–11:00
D. 11:00–1:00

55. Which sequence is correct?

A. Instrument → mirror → patient → equipment
B. Clock position → patient’s head → equipment → neutral-position check
C. Finger rest → equipment → patient → mirror
D. Patient → begin instrumentation → equipment → self-check

56. Which handle design generally requires the least pinch force?

A. Small, heavy, smooth handle
B. Large, lightweight, textured handle
C. Heavy, solid, nontapered handle
D. Handle measuring 6 mm or less

57. When is a periodontal instrument considered balanced?

A. Its working ends curve away from the handle’s midline.
B. Its working ends align with the handle’s long axis.
C. Its handle is heavier than its working ends.
D. Its two working ends have different designs.

58. Which instrument is most appropriate for removing heavy calculus deposits?

A. Instrument with a flexible shank
B. Instrument with a rigid shank
C. Explorer with an extremely thin shank
D. Instrument with no handle texture

59. Which selection is appropriate for subgingival instrumentation of a posterior tooth?

A. Simple shank with a short functional shank
B. Simple shank with a long functional shank
C. Complex shank with a short functional shank
D. Complex shank with a long functional shank

60. Which row correctly matches the instrument with its design and function?

A. Sickle scaler — semicircular cross section — subgingival calculus removal
B. Periodontal file — blunt rod-shaped end — periodontal tissue evaluation
C. Curet — semicircular cross section and rounded toe — calculus removal
D. Explorer — triangular cross section and pointed back — heavy calculus removal

Answer Key

Fill in the Blank

1. Ergonomics

2. Musculoskeletal

3. Neutral

4. 50

5. Thoracic

6. Pronator

7. Carpal

8. Tenosynovitis

9. Psychomotor

10. 0–20

11. 15–20

12. Chin

13. Modified

14. Shank

15. Ring

16. Front

17. Transillumination

18. Down

19. Pinch

20. Complex

True or False

21. True — Equipment should be adjusted to support the worker.

22. True — Static means fixed for an extended period.

23. False — Tight pinch-gripping increases muscle effort and injury risk.

24. True — These positions place stress on the shoulder tendons.

25. True — These movements are associated with ulnar nerve entrapment.

26. False — The little-finger side should be slightly lower than the thumb side.

27. True — Feet remain flat while the hips sit slightly above the knees.

28. True — The mandibular light is generally placed over the oral cavity.

29. False — A normal field of vision can help with early self-evaluation.

30. False — Overlap makes rolling and controlling the instrument difficult.

31. False — The middle finger guides and feels vibrations from the shank.

32. True — Contact between the middle and ring fingers improves stability.

33. False — Gloves should be loose across the palm and wrist.

34. True — Hypermobility may reduce awareness of joint position.

35. False — A plane mirror produces a double or ghost image.

36. False — Concave mirrors magnify but distort the image.

37. False — Restorations may also appear as dark shadows.

38. True

39. True — The nondominant mirror hand is established first.

40. True — Long functional shanks support subgingival access.

Multiple Choice

41. B — The combination of repetition, force, awkward posture, and poor recovery creates the highest risk.

42. C — Extensor wad strain is linked to independent finger extension.

43. A — Repeated upward and downward wrist extension is associated with tendinitis.

44. B — This position provides balanced seated support.

45. B — Maxillary treatment generally uses a nearly flat chair and chin-up position.

46. A — Mandibular treatment uses a slightly raised chair and chin-down position.

47. B — The middle finger guides the working end and detects vibrations.

48. B — Blanching indicates excessive pressure.

49. C — The ring finger acts as a straight support beam.

50. C — This fit reduces restriction while preserving fingertip sensitivity.

51. C — Front-surface mirrors provide the clearest image.

52. C — Indirect illumination reflects light onto a structure.

53. A — Retraction moves soft tissue away.

54. C — Right-handed posterior aspects facing away use approximately 10:00–11:00.

55. B — Position yourself, position the patient, adjust equipment, and then self-check.

56. B — Large, light, textured handles reduce required pinch force.

57. B — Balance requires alignment with the long axis of the handle.

58. B — Rigid shanks are designed for heavier deposits.

59. D — Posterior teeth require a complex shank; subgingival access requires a long functional shank.

60. C — Curets have semicircular cross sections, rounded toes, and can remove calculus above or below the gingival margin.