Dentinogenesis

Dentinogenesis

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  Dentinoge nesis AhmedAbdulwahab UG: 1330095
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  Dentinogenesis The formation ofdentin Odontoblasts Mantle dentin Primary dentin Secondary dentin Tertiary dentin
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  Formation of mantledentin • Begin by secreting an organic matrix around the area directly adjacent to the IEE • The organic matrix contains collagen fibers with large diameters (0.1-0.2 μm in diameter) • Forming an extension called the odontoblast process. • The secretion of hydroxyapatite crystals and mineralization of the matrix. • This area is known as mantle dentin , a layer usually about 20-150 μm thick.
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  Formation of primarydentin • Odontoblasts increase in size • The larger odontoblasts cause collagen to be secreted in smaller amounts, which results in more tightly arranged mineralization. • Root dentin is consideed different from dentin found in the crrown of the toot, because of the different orientation of collagen fibers.
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  Formation of secondarydentin • Formed after root formation is finished and occurs at a much slower rate. • Forms faster along sections closer to the crown of a tooth. • This development continues throughout life.
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  Formation of tertiarydentin • Forms in reaction to stimuli, such as attrition or dental caries. • Divided into reactionary or reparative dentin. • Reactionary dentin is formed by odontoblasts when the injury does not damage the odontoblast layer. • Reparative dentin is formed by replacement odontoblasts when the injury damages a part of odontoblast layer.
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