Cementoenamel junction

Cementoenamel junction

Labeled molar

The CEJ is the more or less horizontal demarcation line that distinguishes the crown (A) of the tooth from root (B) of the tooth.

Anatomical terminology

The cementoenamel junction, frequently abbreviated as the CEJ, is a slightly visible anatomical border identified on a tooth. It is the location where the enamel, which covers the anatomical crown of a tooth, and the cementum, which covers the anatomical root of a tooth, meet. Informally it is known as the neck of the tooth.[1] The border created by these two dental tissues has much significance as it is usually the location where the gingiva attaches to a healthy tooth by fibers called the gingival fibers.

Active recession of the gingiva reveals the cementoenamel junction in the mouth and is usually a sign of an unhealthy condition.

There exists a normal variation in the relationship of the cementum and the enamel at the cementoenamel junction. In about 60–65% of teeth, the cementum overlaps the enamel at the CEJ, while in about 30% of teeth, the cementum and enamel abut each other with no overlap. In only 5–10% of teeth, there is a space between the enamel and the cementum at which the underlying dentin is exposed.[2]


  1. Clemente C (1987). Anatomy, A Regional Atlas of the Human Body. Baltimore: Urban & Schwarzenberg. ISBN 0-8067-0323-7.
  2. Carranza FA, Bernard GW (2002). "The Tooth-Supporting Structures". In Newman MG, Takei HH, Carranza FA. Carranza’s Clinical Periodontology (9th ed.). Philadelphia: W. B. Saunders. p. 43. ISBN 978-0721683317.

External links

This article is issued from Wikipedia - version of the 6/8/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.