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.

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Lower central incisors still respond to heat, cold, EPT. What pathological condition could this indicate?

Periapical abscess
Dental caries
Periapical cemento-osseous dysplasia
Acute pulpitis

The correct answer is: Periapical cemento-osseous dysplasia

Lower central incisors typically stop responding to heat, cold, and EPT after the age of 30. Therefore, if a person's lower central incisors still respond to these stimuli, it could indicate a pathological condition. Options A, B, and D are all conditions that can cause changes in tooth sensitivity, but C is the only one that specifically affects the cemento-osseous tissue surrounding the tooth. Periapical abscess and dental caries are both infections that can cause a tooth to become highly sensitive or lose sensation altogether. Acute pulpitis is an inflammation of the tooth's pulp that can cause sensitivity, but it typically affects multiple teeth and not just the lower central incisors. Periapical cemento-osseous dysplasia specifically affects the cemento-osseous tissue and can result in an increased sensitivity to thermal and electric stimuli in the affected tooth.