Search results
Results from the WOW.Com Content Network
The dental lamina is a band of epithelial tissue seen in histologic sections of a developing tooth. [1] [2] The dental lamina is first evidence of tooth development and begins (in humans) at the sixth week in utero or three weeks after the rupture of the buccopharyngeal membrane. It is formed when cells of the oral ectoderm proliferate faster ...
This mineralized phase occurs very early around the 3rd or 4th month of pregnancy. This marks the first appearance of enamel in the body. Ameloblasts make enamel at the location of where the cusps of the teeth are located. Enamel grows outwards, away from the center of the tooth. [citation needed]
The enamel on primary teeth has a more opaque crystalline form and thus appears whiter than on permanent teeth. The large amount of mineral in enamel accounts not only for its strength but also for its brittleness. [6] Tooth enamel ranks 5 on Mohs hardness scale (between steel and titanium) and has a Young's modulus of 83 GPa. [4]
Plane-form enamel hypoplasia is a dental condition that is distinguished by defects in the teeth enamel, that can occur due to genetic and/or environmental factors. It is common for the disease to occur during the developmental stages of the teeth, and childhood illnesses, such as respiratory infections, are often linked to disturbance of the enamel formation [5] [6].
Although tooth eruption occurs at different times for different people, a general eruption timeline exists. The tooth buds of baby teeth start to develop around 6 weeks of pregnancy. Adult teeth buds start forming around 4 months of pregnancy. The entire tooth will start to form from the crown down to the root. [8]
Enamel appears to be comparable to dentine in its radiodensity on radiographs. Type 3 - Hypocalcified Enamel defect due to malfunction of enamel calcification, therefore enamel is of normal thickness but is extremely brittle, with an opaque/chalky presentation. Teeth are prone to staining and rapid wear, exposing dentine.
The cap stage is the second stage of tooth development and occurs during the ninth or tenth week of prenatal development. Unequal proliferation of the tooth bud forms a three-dimensional cap shape. Overlying this cap structure is the ectomesenchyme , which is attached to the mesodermal tissue known as the dental papilla superiorly, and lies ...
Enamel hypoplasia is a developmental defect of enamel that occurs during tooth development, mainly pre-natal or during early childhood. Teeth affected by enamel hypoplasia are at a higher risk of caries since there is an increased loss of minerals and therefore the tooth surface is able to breakdown more easily in comparison to a non ...