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(2026 / 2027) 100% Guaranteed Pass ||Complete A+

Test Bank for Fundamentals of Periodontal Instrumentation &
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ly Advanced Root Instrumentation 8th Edition Gehrig, Sroda,
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ly Saccuzzo | All Modules (1–27) |With Questions And Revised
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ly Correct Answers &Explanations() 100% Guaranteed
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ly Pass ||Complete A+ Guide
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BestGuidesStuvia

,MODULE 1: ERGONOMICS AND PERIODONTAL ly ly ly ly




INSTRUMENTATION
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30 Multiple Choice Questions
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1. What is the primary goal of ergonomics in periodontal instrumentation?
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A) Increase speed of instrumentation
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B) Reduce risk of work-related musculoskeletal disorders
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C) Minimize patient discomfort
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D) Extend instrument sharpness
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Answer: B ly




Explanation: Ergonomics focuses on fitting the job to the worker. In dentistry, proper
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ergonomics reduces fatigue, strain, and long-term injuries (carpal tunnel, back pain)
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while maintaining clinical effectiveness. Speed or sharpness are secondary benefits, not
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primary goals.
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2. Which of the following is a common musculoskeletal disorder associated with poor
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dental operator posture?
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A) Hypertension
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B) Carpal tunnel syndrome
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C) Dental caries
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D) Gingivitis
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Answer: B ly




Explanation: Prolonged static postures, repetitive wrist motions, and forceful grips can
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compress the median nerve, causing carpal tunnel syndrome. Hypertension and caries
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are not ergonomic-related MSDs.
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3. The clinician’s line of sight should be directed ______ to the treatment area.
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A) from an oblique angle
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,B) perpendicular and direct
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C) from below the patient’s chin
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D) only through the dental mirror
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Answer: B ly




Explanation: Direct, perpendicular line of sight reduces neck twisting and maintains a
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neutral cervical spine. Over-reliance on mirrors or oblique views increases muscle
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fatigue.
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4. What is the recommended weight shift pattern for a seated right-handed clinician
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during mandibular right posterior instrumentation?
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A) Shift weight to left buttock
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B) Shift weight forward onto thighs
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C) Maintain equal weight on both buttocks
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D) Shift weight to right buttock
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Answer: A ly




Explanation: To maintain a balanced, stable position, the clinician shifts weight toward
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the side opposite the working area. For right posterior, weight shifts left; for left
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posterior, weight shifts right.
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5. The patient’s head position should be adjusted so that the occlusal plane is ______
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when working on the maxillary arch.
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A) parallel to the floor
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B) at a 45° angle to the floor
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C) vertical to the floor
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D) tilted away from the clinician
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Answer: A ly




Explanation: For maxillary instrumentation, the occlusal plane should be nearly parallel to
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the floor. This allows direct vision and neutral wrist positioning. For mandibular, the
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plane is slightly lowered.
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6. Which of the following is NOT a component of the “neutral position” for a seated
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clinician?
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, A) Thighs parallel to floor
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B) Feet flat on floor
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C) Head tilted 30° toward the patient
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D) Forearms parallel to floor
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Answer: C ly




Explanation: Neutral position requires head upright (not tilted) with cervical spine in
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alignment. Head tilting strains neck muscles. Thighs parallel, feet flat, and forearms
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parallel are correct neutral elements.
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7. The clinician’s elbow should be positioned at what angle relative to the torso?
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A) 0° (tucked close to body)
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B) 45°–60° away from torso
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C) 90° (straight out to side)
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D) 120° (above shoulder height)
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Answer: B ly




Explanation: Elbows held approximately 45–60° from the torso allow shoulder relaxation
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and efficient forearm movement. Tucked elbows restrict motion; wide angles strain
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rotator cuff.
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8. When using an indirect vision (mirror), the clinician should primarily move which joint
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to avoid neck strain?
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A) Neck vertebrae
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B) Lumbar spine
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C) Eyes only
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D) Wrist and elbow
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Answer: D ly




Explanation: Instead of craning the neck, the clinician should use wrist and elbow
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movements to adjust the mirror angle, keeping the head in a neutral position.
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9. A saddle seat stool is preferred for periodontal instrumentation because it:
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A) Forces a slouched posture
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B) Allows the thighs to be at a 90° angle to the torso
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