In dental anatomy , the cementoenamel junction ( CEJ) 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. The border created by these two dental tissues has much significance as it is usually the location where the gingiva (gums) attaches to a healthy tooth by fibers called the gingival fibers .
11-472: [REDACTED] Look up cej in Wiktionary, the free dictionary. CEJ may refer to: Cementoenamel junction Central European Jamboree Chernihiv Shestovitsa Airport Coastal Engineering Journal , a publication by World Scientific CE Johansson AB, the parent firm established by Carl Edvard Johansson Cotton-Eyed Joe Topics referred to by
22-461: A thin layer of intermediate cementum are fundamental for the onset of cementogenesis . If Hertwig's epithelial root sheath is not fragmented, there will be enamel deposition and it will be transformed into reduced epithelium, thus preventing cementum deposition on its surface. The shape and location of the cementoenamel junction (CEJ) on each tooth surface should be considered. CEJs differ from tooth to tooth in terms of their anatomy. The curvature of
33-563: A vital pulp (invasive cervical root resorption) and external apical root resorption. Mesial This is a list of definitions of commonly used terms of location and direction in dentistry . This set of terms provides orientation within the oral cavity, much as anatomical terms of location provide orientation throughout the body. Most of the principal terms can be combined using their corresponding combining forms (such as mesio- for mesial and disto- for distal ). They provide names for directions (vectors) and axes; for example,
44-399: Is caused by tooth resorption, which occurs in 5 to 10 percent of the population. The clinical location of CEJ which is a static landmark, serves as a crucial anatomical site for the measurement of probing pocket depth (PPD) and clinical attachment level (CAL). The CEJ varies between subjects, but also between teeth from the same person. There exists a normal variation in the relationship of
55-439: Is different from Wikidata All article disambiguation pages All disambiguation pages Cementoenamel junction Active recession of the gingiva reveals the cementoenamel junction in the mouth and is usually a sign of an unhealthy condition. The loss of attachment is considered a more reliable indicator of periodontal disease . The CEJ is the site of major tooth resorption . A significant proportion of tooth loss
66-940: The CEJ is greatest on anterior teeth due to the narrow profile of these teeth. On the anteriors, the distal aspect's curvature is usually one mm lower than the mesial aspect. Posterior teeth have flatter CEJ curvatures on the inter-proximal surfaces in comparison to the anteriors. Root resorption often starts at cementoenamel junction (CEJ) in teeth. Types of tooth resorption include internal resorption and external resorption. There are two types of internal resorption - root canal (internal) replacement resorption and internal inflammatory resorption. External resorption can be classified into four categories by its clinical and histologic manifestations: external surface resorption, external inflammatory root resorption, replacement resorption, and ankylosis . External inflammatory root resorption can be further categorized into cervical resorption with or without
77-407: 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. In the tooth bud, regions where enamel formation is completed,
88-513: The coronoapical axis is the long axis of a tooth. Such combining yields terms such as those in the following list. The abbreviations should be used only in restricted contexts, where they are explicitly defined and help avoid extensive repetition (for example, a journal article that uses the term "mesiodistal" dozens of times might use the abbreviation "MD"). The abbreviations are ambiguous: (1) they are not specific to these terms; (2) they are not even one-to-one specific within this list; and (3) some of
99-421: The enamel organ gives rise to Hertwig's epithelial root sheath, composed of two epithelial layers derived from the external and internal epithelia. The sheath is irregularly fragmented in time and space as it promotes cementum deposition on the newly formed dentin. After this fragmentation, Hertwig's epithelial root sheath also participates in cementogenesis and formation of the periodontal ligament , giving rise to
110-491: The epithelial rests of Malassez. This irregular fragmentation of Hertwig's epithelial root sheath yields an equally irregular limit of cervical enamel and an irregular onset of formation and deposition of cementum. Consequently, the relationship between cementum and enamel at the CEJ presents an irregular contour, as observed during scanning electron microscope (SEM) analysis of the primary teeth. Fragmentation of Hertwig's epithelial root sheath and exposure of dentin covered by
121-402: The same term [REDACTED] This disambiguation page lists articles associated with the title CEJ . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=CEJ&oldid=740864860 " Category : Disambiguation pages Hidden categories: Short description
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