n
cervical line
The junction of the enamel of the crown and the cementum of the root of a tooth. The area above the junction corresponds to the anatomic crown of the tooth; the area apical to the junction constitutes the anatomic root of the tooth.
| Dental Dictionary: cementoenamel junction |
The junction of the enamel of the crown and the cementum of the root of a tooth. The area above the junction corresponds to the anatomic crown of the tooth; the area apical to the junction constitutes the anatomic root of the tooth.
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| Medical Dictionary: ce·men·to·e·nam·el junction |
The surface at which the enamel of the crown and the cementum of the root of a tooth are joined.
| Wikipedia: Cementoenamel junction |
The cementoenamel junction, frequently abbreviated as the CEJ, is an anatomical landmark identified on a tooth. It is the location where the enamel, which covers the crown of a tooth, and the cementum, which covers the root of a tooth, meet. 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.[1]
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