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1. When performing a dental prophylaxis, which of the following
instruments would be most appropriate for removing supragingival
calculus?
 A) Sickle scaler
 B) Periodontal probe
 C) Ultrasonic scaler
 D) Curette
 **Answer: A**. Sickle scalers are designed with a pointed tip ideal for
removing larger pieces of supragingival calculus.
2. Which technique is recommended to ensure complete plaque removal
when brushing teeth?
 A) Horizontal scrub
 B) Fones technique
 C) Bass method
 D) Stillman's method
 **Answer: C**. The Bass method involves angling the bristles at a 45-
degree angle towards the gumline and making small circular motions,
which is effective for plaque removal.
3. In dental hygiene practice, which of the following indices is used to
measure periodontal disease activity?
 A) Decayed, Missing, and Filled Teeth (DMFT)
 B) Oral Hygiene Index (OHI)
 C) Periodontal Screening and Recording (PSR)
 D) Community Periodontal Index (CPI)
 **Answer: C**. PSR is a quick and efficient screening tool used to
assess periodontal health and disease activity.
4. What is the primary rationale for using an interdental brush?
 A) To apply fluoride
 B) To remove interproximal plaque
 C) To massage the gums
 D) To whiten teeth
 **Answer: B**. Interdental brushes are designed to remove plaque from
between teeth where regular toothbrushes cannot reach.
5. Which of the following is a contraindication for air-polishing?
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