Cementum
Pronunciation: suh-MEN-tum
The thin calcified tissue covering the root surface of a tooth, providing attachment for the periodontal ligament.
Full Definition
Cementum is a specialised mineralised tissue that covers the outer surface of the tooth root. It serves as the attachment point for the periodontal ligament fibres (Sharpey's fibres) that anchor the tooth within its bony socket. Cementum is softer than both enamel and dentine and can be exposed following gingival recession, making it susceptible to root caries and abrasion. Editors must not confuse cementum with cement (the restorative material) or with enamel, which covers the crown, not the root.
Usage
Usage note: Take care to distinguish 'cementum' (the biological tooth tissue) from 'cement' (the restorative luting or filling material). Both terms appear in dental records and the similarity can cause editorial errors.
In Context
- "Root caries affecting the exposed cementum was identified at the gingival margin of the lower right canine." — Clinical examination note
- "The cementoenamel junction marks the boundary between enamel and cementum." — Periodontic educational reference