National Board Dental Hygiene Examination (NBDHE) Dental Hygienist Practice Test

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Prepare for the National Board Dental Hygiene Exam. Study with flashcards and multiple-choice questions, each offering hints and explanations. Ace your exam!

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A vasoconductor does which of the following when used in conjunction with Lidocaine?

Helps the drug get into the blood stream
Helps the numbing drug work
Makes the numbness wear off
Makes the numbness last longer

The correct answer is: Makes the numbness last longer

When Lidocaine is used in conjunction with a vasoconstrictor, the primary benefit is the prolongation of the anesthetic effect. Vasoconstrictors, such as epinephrine, constrict the blood vessels in the area where the anesthetic is administered. This constriction reduces blood flow, which minimizes the absorption of the anesthetic into the bloodstream. As a result, Lidocaine remains localized at the injection site for a longer duration, allowing for more effective and extended numbing of the targeted area. This enhanced duration of numbness is particularly beneficial in dental procedures, as it allows patients to remain comfortable for an extended period while also limiting the systemic effects of the anesthetic. By decreasing the rate at which Lidocaine is metabolized and cleared from the site, the vasoconstrictor directly contributes to a longer-lasting effect.