Local anaesthesia: practice question

A Dentistry question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Dentistry · Local anaesthesia

Sample item

Why is a vasoconstrictor added to many dental local anaesthetics?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

D. Prolong local effect and reduce systemic absorption

Vasoconstrictors reduce local blood flow, prolonging anaesthesia and decreasing systemic absorption while also aiding haemostasis in selected patients.

Option by option

  • A. Cause immediate pulp regeneration

    Pulp does not regenerate from vasoconstrictor.

  • B. Replace aspiration technique

    Aspiration remains a separate safety step.

  • C. Sterilize the surgical field

    Sterility requires infection-control methods.

  • D. Prolong local effect and reduce systemic absorption (correct)

    Correct: reduced perfusion prolongs anaesthetic effect.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Dentistry question

What is the answer to this Dentistry question?

The best answer is D, Prolong local effect and reduce systemic absorption. Vasoconstrictors reduce local blood flow, prolonging anaesthesia and decreasing systemic absorption while also aiding haemostasis in selected patients.

Why is "Cause immediate pulp regeneration" not the answer?

Pulp does not regenerate from vasoconstrictor.

Why is "Replace aspiration technique" not the answer?

Aspiration remains a separate safety step.

Why is "Sterilize the surgical field" not the answer?

Sterility requires infection-control methods.

What concept does this question test?

It tests Local anaesthesia in Dentistry. The correct option holds because: Correct: reduced perfusion prolongs anaesthetic effect.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Local anaesthesia?

Learn the dental formula, eruption ages and tooth structure once, as tables. Then use the flashcards and the other Dentistry questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.