Comment: Osteodentin is formed after injury to the pulp or displacement of odontoblasts. If a tooth fractures, the pulp chamber will fill with this material in order to seal it off.

What are dentinal tubules made of?

The dentinal tubules contain the cytoplasmic extensions of odontoblasts that once formed the dentin and maintain it. The cell bodies of the odontoblasts are aligned along the inner aspect of dentin against a layer of predentin where they also form the peripheral boundary of the dental pulp.

How is primary dentin formed?

Dentin formation is initiated by the odontoblasts of the pulp. Dentin comes from the dental papilla of the tooth germ. Unlike enamel, dentin forms throughout your life. The growth of dentin can be initiated from stimuli, such as tooth decay or attrition.