Test Bank for Fundamentals of Periodontal Instrumentation &
Advanced Root Instrumentation 8th Edition Gehrig, Sroda,
Saccuzzo | All Modules (1–27) |With Questions And Revised
Correct Answers &Explanations() 100% Guaranteed
Pass ||Complete A+ Guide
Geniusexpert stuvia
,MODULE 1: ERGONOMICS AND PERIODONTAL
INSTRUMENTATION
30 Multiple Choice Questions
1. What is the primary goal of ergonomics in periodontal instrumentation?
A) Increase speed of instrumentation
B) Reduce risk of work-related musculoskeletal disorders
C) Minimize patient discomfort
D) Extend instrument sharpness
Answer: B
Explanation: Ergonomics focuses on fitting the job to the worker. In dentistry, proper
ergonomics reduces fatigue, strain, and long-term injuries (carpal tunnel, back pain)
while maintaining clinical effectiveness. Speed or sharpness are secondary benefits, not
primary goals.
2. Which of the following is a common musculoskeletal disorder associated with poor
dental operator posture?
A) Hypertension
B) Carpal tunnel syndrome
C) Dental caries
D) Gingivitis
Answer: B
Explanation: Prolonged static postures, repetitive wrist motions, and forceful grips can
compress the median nerve, causing carpal tunnel syndrome. Hypertension and caries
are not ergonomic-related MSDs.
3. The clinician’s line of sight should be directed ______ to the treatment area.
A) from an oblique angle
,B) perpendicular and direct
C) from below the patient’s chin
D) only through the dental mirror
Answer: B
Explanation: Direct, perpendicular line of sight reduces neck twisting and maintains a
neutral cervical spine. Over-reliance on mirrors or oblique views increases muscle
fatigue.
4. What is the recommended weight shift pattern for a seated right-handed clinician
during mandibular right posterior instrumentation?
A) Shift weight to left buttock
B) Shift weight forward onto thighs
C) Maintain equal weight on both buttocks
D) Shift weight to right buttock
Answer: A
Explanation: To maintain a balanced, stable position, the clinician shifts weight toward
the side opposite the working area. For right posterior, weight shifts left; for left
posterior, weight shifts right.
5. The patient’s head position should be adjusted so that the occlusal plane is ______
when working on the maxillary arch.
A) parallel to the floor
B) at a 45° angle to the floor
C) vertical to the floor
D) tilted away from the clinician
Answer: A
Explanation: For maxillary instrumentation, the occlusal plane should be nearly parallel
to the floor. This allows direct vision and neutral wrist positioning. For mandibular, the
plane is slightly lowered.
6. Which of the following is NOT a component of the “neutral position” for a seated
clinician?
, A) Thighs parallel to floor
B) Feet flat on floor
C) Head tilted 30° toward the patient
D) Forearms parallel to floor
Answer: C
Explanation: Neutral position requires head upright (not tilted) with cervical spine in
alignment. Head tilting strains neck muscles. Thighs parallel, feet flat, and forearms
parallel are correct neutral elements.
7. The clinician’s elbow should be positioned at what angle relative to the torso?
A) 0° (tucked close to body)
B) 45°–60° away from torso
C) 90° (straight out to side)
D) 120° (above shoulder height)
Answer: B
Explanation: Elbows held approximately 45–60° from the torso allow shoulder relaxation
and efficient forearm movement. Tucked elbows restrict motion; wide angles strain
rotator cuff.
8. When using an indirect vision (mirror), the clinician should primarily move which joint
to avoid neck strain?
A) Neck vertebrae
B) Lumbar spine
C) Eyes only
D) Wrist and elbow
Answer: D
Explanation: Instead of craning the neck, the clinician should use wrist and elbow
movements to adjust the mirror angle, keeping the head in a neutral position.
9. A saddle seat stool is preferred for periodontal instrumentation because it:
A) Forces a slouched posture
B) Allows the thighs to be at a 90° angle to the torso
Advanced Root Instrumentation 8th Edition Gehrig, Sroda,
Saccuzzo | All Modules (1–27) |With Questions And Revised
Correct Answers &Explanations() 100% Guaranteed
Pass ||Complete A+ Guide
Geniusexpert stuvia
,MODULE 1: ERGONOMICS AND PERIODONTAL
INSTRUMENTATION
30 Multiple Choice Questions
1. What is the primary goal of ergonomics in periodontal instrumentation?
A) Increase speed of instrumentation
B) Reduce risk of work-related musculoskeletal disorders
C) Minimize patient discomfort
D) Extend instrument sharpness
Answer: B
Explanation: Ergonomics focuses on fitting the job to the worker. In dentistry, proper
ergonomics reduces fatigue, strain, and long-term injuries (carpal tunnel, back pain)
while maintaining clinical effectiveness. Speed or sharpness are secondary benefits, not
primary goals.
2. Which of the following is a common musculoskeletal disorder associated with poor
dental operator posture?
A) Hypertension
B) Carpal tunnel syndrome
C) Dental caries
D) Gingivitis
Answer: B
Explanation: Prolonged static postures, repetitive wrist motions, and forceful grips can
compress the median nerve, causing carpal tunnel syndrome. Hypertension and caries
are not ergonomic-related MSDs.
3. The clinician’s line of sight should be directed ______ to the treatment area.
A) from an oblique angle
,B) perpendicular and direct
C) from below the patient’s chin
D) only through the dental mirror
Answer: B
Explanation: Direct, perpendicular line of sight reduces neck twisting and maintains a
neutral cervical spine. Over-reliance on mirrors or oblique views increases muscle
fatigue.
4. What is the recommended weight shift pattern for a seated right-handed clinician
during mandibular right posterior instrumentation?
A) Shift weight to left buttock
B) Shift weight forward onto thighs
C) Maintain equal weight on both buttocks
D) Shift weight to right buttock
Answer: A
Explanation: To maintain a balanced, stable position, the clinician shifts weight toward
the side opposite the working area. For right posterior, weight shifts left; for left
posterior, weight shifts right.
5. The patient’s head position should be adjusted so that the occlusal plane is ______
when working on the maxillary arch.
A) parallel to the floor
B) at a 45° angle to the floor
C) vertical to the floor
D) tilted away from the clinician
Answer: A
Explanation: For maxillary instrumentation, the occlusal plane should be nearly parallel
to the floor. This allows direct vision and neutral wrist positioning. For mandibular, the
plane is slightly lowered.
6. Which of the following is NOT a component of the “neutral position” for a seated
clinician?
, A) Thighs parallel to floor
B) Feet flat on floor
C) Head tilted 30° toward the patient
D) Forearms parallel to floor
Answer: C
Explanation: Neutral position requires head upright (not tilted) with cervical spine in
alignment. Head tilting strains neck muscles. Thighs parallel, feet flat, and forearms
parallel are correct neutral elements.
7. The clinician’s elbow should be positioned at what angle relative to the torso?
A) 0° (tucked close to body)
B) 45°–60° away from torso
C) 90° (straight out to side)
D) 120° (above shoulder height)
Answer: B
Explanation: Elbows held approximately 45–60° from the torso allow shoulder relaxation
and efficient forearm movement. Tucked elbows restrict motion; wide angles strain
rotator cuff.
8. When using an indirect vision (mirror), the clinician should primarily move which joint
to avoid neck strain?
A) Neck vertebrae
B) Lumbar spine
C) Eyes only
D) Wrist and elbow
Answer: D
Explanation: Instead of craning the neck, the clinician should use wrist and elbow
movements to adjust the mirror angle, keeping the head in a neutral position.
9. A saddle seat stool is preferred for periodontal instrumentation because it:
A) Forces a slouched posture
B) Allows the thighs to be at a 90° angle to the torso
