Q: Which instrument type and cross-sectional shape are matched correctly?
instrumetation, instrument, explorer, universal curette, sickle, dental hygiene exam prep

Q: Which instrument type and cross-sectional shape are matched correctly?

Which instrument type and cross-sectional shape are matched correctly?

(A.) Explorer – half moon
(B.) Universal curette – circle
(C.) Sickle – triangle
(D.) Area-specific curette – rectangle

instrumetation, instrument, explorer, universal curette, sickle, dental hygiene exam prep
Mini Boards Reviews for the National + Local Anesthesia Dental Hygiene Boards

Answer: (C.) Sickle – triangle

The design of the working end and its cross-sectional shape are directly related to the function of the instrument.

  • Half-moon cross-sectional shape instrument: rounded at the back. Used subgingivally to protect the soft tissues. E.g., universal curette, area-specific curette.
  • Triangular cross-sectional shape instrument: pointed at the back. Used only supragingivally (to avoid damage to subgingival tissues). E.g., sickle.
  • Circular cross section: explorers have a circular cross section with a thin end that detects deposits.
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Written by
Claire Jeong, RDH, MS

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