| 词条 | Cementoenamel junction |
| 释义 |
| Name = Cementoenamel junction | Latin = | Image = Labeledmolar.jpg | Caption = Labeled molar | Image2 = The Periodontium.jpg | Caption2 = The CEJ is the more or less horizontal demarcation line that distinguishes the crown (A) of the tooth from root (B) of the tooth. | Precursor = | System = | Artery = | Vein = | Nerve = | Lymph = }} 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] References1. ^{{cite book | author = Clemente C | title = Anatomy, A Regional Atlas of the Human Body | publisher = Urban & Schwarzenberg | location = Baltimore | year = 1987 | isbn = 0-8067-0323-7 }} 2. ^{{ cite book |vauthors=Carranza FA, Bernard GW | chapter = The Tooth-Supporting Structures |veditors=Newman MG, Takei HH, Carranza FA | title = Carranza’s Clinical Periodontology | edition = 9th | location = Philadelphia | publisher = W. B. Saunders | year = 2002 | page = 43 | isbn = 978-0721683317 }} External links
3 : Dental enamel|Parts of tooth|Human mouth anatomy |
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