Cementum: Structure, Types and Functions

Cementum is a hard layer of calcified mesenchymal tissues which forms the outer covering of the anatomical root. It is also called as substantia ossea.

Cementum extends from the cementoenamel junction to the apex of tooth. It forms a covering on root surface, which seals the open dentinal tubules of root dentin and provides an attachment for periodontal ligament that holds the tooth in its socket.

It was first microscopically demonstrated by two pupils of Purkinje in 1835.

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