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The effects of this process include the demineralization of crystals in the enamel, caused by acids, over time until the bacteria physically penetrate the dentin. Enamel rods, which are the basic unit of the enamel structure, run perpendicularly from the surface of the tooth to the dentin. Since demineralization of enamel by caries follows the ...
The perception of tooth colour is multi-factorial. Reflection and absorption of light by the tooth can be influenced by a number of factors including specular transmission of light through the tooth; specular reflection at the surface; diffuse light reflection at the surface; absorption and scattering of light within the dental tissues; enamel mineral content; enamel thickness; dentine colour ...
The cavity-prevention effect of fluoride is partly due to these surface effects, which occur during and after tooth eruption. [17] Fluoride interferes with the process of tooth decay as fluoride intake during the period of enamel development for up to 7 years of age; the fluoride alters the structure of the developing enamel making it more ...
Enamel-dentin fracture A fracture is confined to enamel and dentin with loss of tooth structure, but exposing the pulp; Not tender upon percussion test; If tenderness is observed, evaluate the tooth for possible luxation or root fracture injury; Normal mobility; Sensibility pulp test is usually positive; Enamel-dentin loss is visible
When dentin, which normally supports enamel, is destroyed by a physiologic condition or by decay, enamel is unable to compensate for its brittleness and breaks away from the tooth easily. The effects of bruxism on an anterior tooth, revealing the dentin and pulp which are normally hidden by enamel
Secondary dentin is darker and more opaque than primary dentin. This gives the dentin an overall darker appearance. [11] At the same time, the enamel layer is gradually thinned by tooth wear processes such as attrition and acid erosion, a degree of which is considered normal. [11] Enamel also becomes less porous and phosphate-deficient.
Enamel infractions are microcracks seen within the dental enamel of a tooth. [1] They are commonly the result of dental trauma to the brittle enamel, which remains adherent to the underlying dentine. They can be seen more clearly when transillumination is used. Enamel infractions are found more often in older teeth, as the accumulated trauma is
The majority of the tooth structure is formed from dentin, and the enamel serves as the superficial layer of the crown while the cementum serves to cover the root. In the mid-1990s, however, it was discovered that a very thin layer of enamel actually exists between the dentin and cementum on the roots of adult human teeth.