National Dental Examining Board of Canada (NDEB) Practice Exam

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Master your National Dental Examining Board of Canada (NDEB) exams with our comprehensive practice guide. Achieve excellence in your dental certification with expertly crafted questions and detailed explanations.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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In case of an allergy to para-amino benzoic acid derivatives, which type of LA cannot be used?

Ester
Amide
Both Ester and Amide
Neither Ester nor Amide

The correct answer is: Ester

Para-amino benzoic acid is an ingredient found in certain local anesthetics and is a common allergen. Ester-type local anesthetics such as Procaine and Tetracaine contain para-amino benzoic acid and can cause an allergic reaction in those who are allergic. Amide-type local anesthetics such as Lidocaine and Bupivacaine do not contain this ingredient and are safe to use for those with an allergy to para-amino benzoic acid derivatives. Therefore, the correct answer is A because Ester-type local anesthetics cannot be used in case of an allergy to para-amino benzoic acid derivatives.