National Dental Assisting Examining Board (NDAEB) Practice Exam

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Prepare for the National Dental Assisting Exam with comprehensive quiz questions, including multiple choice and detailed explanations. Equip yourself for success!

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What is added to local anesthetics to extend their duration of action?

A vasopressor
A vasodilator
A vasoconstrictor
A local anesthetic agent

The correct answer is: A vasoconstrictor

The addition of a vasoconstrictor to local anesthetics is a common practice aimed at extending the duration of their action. Vasoconstrictors work by narrowing blood vessels at the injection site, which reduces blood flow. This slower blood flow minimizes the systemic absorption of the anesthetic, allowing it to remain localized for a more extended period. As a result, the anesthetic can provide prolonged pain relief during dental procedures. Incorporating a vasoconstrictor can also enhance the effectiveness of the anesthetic by increasing its efficacy and reducing the likelihood of side effects associated with rapid absorption into the bloodstream. Therefore, the inclusion of a vasoconstrictor is essential in optimizing the performance of local anesthetics in dental practice.