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Cementum

A thin layer of mineralised tissue covering the root dentin.

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Composition

About 45–50% mineral by weight

Function

Provides attachment for the fibres of the periodontal ligament that hold the tooth in its socket.

Clinical relevance

Cementum is thinnest near the cementoenamel junction and thicker toward the apex. Its thickness is exaggerated slightly in Dental Scope so it can be seen.

Related structures

Periodontal ligament · Radicular dentin

This text is a draft and has not yet been reviewed by a dental professional. Educational reference only, not for diagnosis or treatment.