Anatomy & Histology of the Gingival Unit and Basic Oral Hygiene
Glossary

Before beginning the study of the gingiva and oral hygiene procedures it is necessary to define several terms commonly used.

apical – Towards the root.

cementoenamel junction (CEJ) – Junction of cementum (root) and enamel (crown).

coronal – Towards the chewing surface of the tooth.

gingival margin – Portion of the free gingiva that is located at the CEJ.

histology – The study of tissues.

interdental papilla – Gingiva extending between two adjacent teeth.

pellicle – Thin film made of saliva, cells, and bacteria that starts the plaque formation process.

periodontium – Collective term for the structures that support the teeth.