During eruption of permanent premolars, resorption occurs in which structures?

• A. Interradicular dentin
• B. Pulp chamber
• C. Coronal dentin
• D. All of the above

Answer: (D)

During eruption, the path for the permanent premolar is cleared by resorbing the deciduous predecessor. This resorption isn’t confined to a single tissue; odontoclasts can digest dentin and cementum in several regions of the tooth that lie in the eruption path. Interradicular dentin between the roots of the deciduous tooth is a primary site as the root is resorbed to allow eruption. As eruption advances, resorption can extend to coronal dentin near the crown, and if activity continues deeply, it can involve tissue near the pulp chamber. Therefore, resorption can occur in interradicular dentin, coronal dentin, and even the pulp chamber, making all of the above the best answer.