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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Which factor increases a local anesthetic's effectiveness?

Pupil dilation
High temperature
Vasoconstrictor addition
Increased gauge of the needle

The correct answer is: Vasoconstrictor addition

The effectiveness of a local anesthetic is enhanced by the addition of a vasoconstrictor. Vasoconstrictors, such as epinephrine, are often incorporated into local anesthetic solutions to constrict blood vessels in the area where the anesthetic is administered. This constriction limits blood flow, which helps to keep the anesthetic in the targeted area for a longer duration, thereby prolonging the anesthetic's effect and reducing the likelihood of systemic absorption. Furthermore, the use of a vasoconstrictor can also minimize bleeding in the surgical site, which improves visibility for the dental professional and enhances patient safety during procedures. Overall, the addition of a vasoconstrictor significantly boosts the local anesthetic's overall effectiveness and efficiency in pain management during dental procedures.