The Strength Behind Your Teeth
Dentin is a calcified tissue of the body, alongside with enamel
, cementum, and pulp. Dentin is one of the four major components that build up teeth. Typically, it is covered by the enamel on the crown and cementum on the root, and surrounds the pulp entirely. By weight, seventy percent of dentin is made up of the mineral hydroxylapatite, twenty percent is organic material, and twenty percent is pure water. Yellow in appearance, it deeply affects the color of a tooth because of the enamels translucency. Dentin, not as much mineralized and less brittle than enamel, is necessary to support enamel itself.
Dentin is comprised of dentinal tubules, a mass of microscopic tunnels which radiate outward through the dentin from the pulp, to the exterior cementum or enamel border. These tubules contain fluid and cellular structures. As a result, dentin has a degree of permeability and porosity which can increase pain sensation and the rate of dental caries.
The formation of dentin, called as dentinogenesis, begins before the formation of enamel and is initiated by the odontoblasts of the dental pulp. Unlike enamel, dentin continues to form throughout lifetime and can be initiated in response to stimuli, such as dental caries or abrasion. There are different types of dentin, characterized by appearance and stage of development.
Primary dentin, as a
dentist in Collierville would tell you, is the most prominent dentin in the tooth. It lies between the enamel and the pulp chamber. The outermost layer closest to enamel is called a mantle dentin. This layer is distinctive to the rest of primary dentin. Mantle dentin is formed by newly-differentiated odontoblasts and forms a layer which is approximately one hundred and fifty micrometers wide. Unlike primary dentin, mantle dentin lacks phosphoryn, has loosely-packed collagen fibrils, and is less mineralized. Underneath it lays the circumpulpal dentin, a more mineralized dentin which makes up most of the dentin layer and is secreted after the mantle dentin by the odontoblasts.
Secondary dentin, according to
dentists Collierville has, is formed after root formation has completed, usually after the tooth has erupted and is functional. It grows much more slowly than primary dentin, but it preserves its incremental aspect of growth. It has similar structure to that of primary dentin, though its deposition is not always even around the pulp chamber.
Tertiary dentin is dentin formed as a reaction to external factors such as caries. It is of two types, either reactionary or reparative. Tertiary dentin, according to
dentists in Collierville, is only formed by an odontoblast directly affected by stimulus, therefore architecture and structure depends on the intensity and duration of the stimulus, which is if the stimulus is a lesion, there would be extensive destruction of dentin and damage to the pulp, due to the differentiation of bacterial metabolites and toxins.
by: lawrencegilstrap
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