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The dentinoenamel junction is thought to be of a scalloped structure which has occurred as an exaptation of the epithelial folding that is undergone during ontogeny. This scalloped exaptation has then provided stress relief during mastication and a reduction in dentin-enamel sliding and has thus, not been selected against, making it an ...
The lightish boundary between them is the dentinoenamel junction. From this can be seen enamel tufts growing towards the top right. Enamel tufts are hypomineralized ribbon-like structures that run longitudinally to the tooth axis and extend from the dentinoenamel junction (DEJ) one fifth to a third into the enamel. [1]
Enamel spindles are "short, linear defects, found at the dentinoenamel junction (DEJ) and extend into the enamel, often being more prevalent at the cusp tips." [1] The DEJ is the interface of the enamel and the underlying dentin.
The dentinal tubules extend from the dentinoenamel junction (DEJ) in the crown area, or dentinocemental junction (DCJ) in the root area, to the outer wall of the pulp. [9] From the outer surface of the dentin to the area nearest the pulp, these tubules follow an S-shaped path. The diameter and density of the tubules are greatest near the pulp.
The dentinoenamel junction is the surface at which the enamel and the dentin of the crown of a tooth are joined. [ 7 ] The existing ectomesenchyme around the outside of the cap of the enamel organ then condenses into the dental sac.
Tooth development begins at week 6 in utero, in the oral epithelium. The process is divided into three stages: Initiation; Morphogenesis and; Histogenesis [2]; At the end of week 7 i.u., localised proliferations of cells in the dental laminae form round and oval swellings known as tooth buds, which will eventually develop into mesenchymal cells and surround the enamel organ.
Amelogenesis is the process of forming tooth enamel, the hard, protective outer layer of teeth. [1] This process begins during tooth development after the initial formation of dentin (dentinogenesis), the layer beneath the enamel. [2]
The dentinocemental junction (DCJ) is formed because of the apposition of cementum over the dentin. [6] [7] This interface is not as defined, either clinically or histologically, as that of the dentinoenamel junction (DEJ), given that cementum and dentin are of common embryological background, unlike that of enamel and dentin. [3]