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What defines primary dentin in tooth development?

  1. Dentin that is formed after tooth eruption

  2. Dentin formed from calcification until tooth eruption

  3. Dentin present in primary teeth only

  4. Dentin that secures the dental pulp

The correct answer is: Dentin formed from calcification until tooth eruption

Primary dentin is characterized as the dentin formed during the time of tooth development, specifically from the onset of mineralization until the completion of tooth eruption. This type of dentin is crucial as it constitutes the bulk of the tooth structure before the tooth becomes functional. The maturation of primary dentin occurs before the tooth emerges into the oral cavity, which is what sets it apart from secondary dentin, which is formed after eruption. Understanding primary dentin is essential for grasping tooth anatomy and the timeline of tooth development in dental studies.