National Dental Examining Board of Canada (NDEB) Practice Exam

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Prepare for the National Dental Examining Board of Canada (NDEB) Test. Study with flashcards and multiple choice questions, each question offers hints and detailed explanations. Achieve success in your exam!

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!

Practice this question and more.

Which area of the tooth is most sensitive during cavity preparation?

Pulpal floor
DEJ
Gingival margin
Occlusal surface

The correct answer is: DEJ

During cavity preparation, the dentist removes decayed material from the tooth. The DEJ (dental enamel junction) is the area where the enamel and dentin of the tooth meet. This area is the most sensitive to pain and discomfort during cavity preparation because it is where the nerves and blood vessels responsible for sensation are located. Option A, the pulpal floor, is the area at the bottom of the cavity that is closest to the nerves and blood vessels in the pulp of the tooth. While it can also be sensitive, it is not the most sensitive area during cavity preparation. Option C, the gingival margin, is the area where the tooth meets the gumline. It is also an important area to protect during cavity preparation, but it is not the most sensitive area. Option D, the occlusal surface, is the chewing surface of the tooth. While it may also be