Which cells are responsible for the formation of secondary dentine?

The correct answer, odontoblasts, are specialized cells located in the dental pulp that play a crucial role in the formation of secondary dentine. Secondary dentine is produced after the initial development of primary dentine and serves to provide additional protection to the pulp as well as to adapt to changes in the environment, such as wear and trauma. Odontoblasts continuously deposit dentin throughout the life of the tooth, especially in response to factors like aging or external stimuli, ensuring the integrity and strength of the tooth structure.

Ameloblasts, on the other hand, are involved in the formation of enamel, not dentine. Cementoblasts are responsible for the formation of cementum, which helps anchor the tooth in its socket. Fibroblasts are connective tissue cells found in various tissues and play a role in the maintenance and repair of the dental pulp, but they do not directly contribute to the formation of dentin. Understanding the specific functions of these cells clarifies why odontoblasts are the key players in the production of secondary dentine.