INBDE (Integrated National Board Dental Examination) Practice Exam

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What type of dentin is secreted after root formation?

  1. Primary

  2. Secondary

  3. Tertiary

  4. Reparative

The correct answer is: Secondary

After root formation, the dentin that is produced is referred to as secondary dentin. This type of dentin is formed continuously throughout a person's lifetime and is responsible for reducing the size of the pulp chamber. Primary dentin is formed during tooth development and is not produced after the tooth is fully formed. Tertiary dentin is formed in response to injury or disease and is not specifically related to root formation. Reparative dentin is also formed in response to injury, but is found specifically at the site of injury and is not associated with root formation. Therefore, B is the correct answer.