INBDE (Integrated National Board Dental Examination) Practice Exam

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What type of dentin is secreted before root formation?

Primary
Secondary
Tertiary
Reactionary

The correct answer is: Primary

Before root formation, the dentin that is secreted is known as primary dentin. This initial layer of dentin is produced by odontoblast cells during the development of the tooth. B Secondary dentin is formed after root formation, as a response to stress or as part of the aging process. C: Tertiary dentin is formed in response to injury or decay in the tooth, as a way to protect the pulp. D: Reactionary dentin is formed at the site of injury in the tooth, usually due to caries or trauma. None of these options refer to the initial dentin that is secreted before root formation, making A the correct answer.