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Interglobular dentine (IGD) is an area of poorly mineralized dentine matrix. It has been reported that there is an association between the retraction of odontoblast processes (OP) and the formation of IGD. A variation of the extent of OP has been described depending on the region of the tooth and age.
Tubules are lined with peritubular (intratubular) dentin consisting of a layer of highly mineralized matrix material made primarily of apatite crystals.
Dentin includes atubular peripheral dentin (the mantle dentin in the crown and Hopewell-Smith and/or Tomes’ granular layers in the root) and tubular circumpulpal dentin. After the formation of primary dentin, secondary dentin is formed during the entire life of the functioning tooth.
Unlike enamel, dentin may be demineralized and stained for histological study. Dentin consists of microscopic channels, called dentinal tubules, which radiate outward through the dentin from the pulp to the exterior cementum or enamel border.
If you’re experiencing sensitivity or pain due to exposed dentin, talk to your dentist. They may suggest treatment options that range from changing your toothpaste to using a mouthguard or even in-office procedures such as fluoride treatments and gum therapy. Choose Heritage Dental Centre for your dental care.
Dentin includes primary, secondary, and tertiary dentin. Based on structure, primary dentin is composed of mantle and circumpulpal dentin. Examples of these classifications are given in Fig. 8-1, A.
There are three different types of dentin which include primary, secondary and tertiary. Secondary dentin is a layer of dentin which is produced after the tooth’s root is completely formed. Tertiary dentin is created in response to a stimulus, such the presence of tooth decay or wear.
Deep to the mantle dentin is the layer of dentin around the outer wall of pulp, which makes up the bulk of the dentin in a tooth.
Thus, unlike enamel, dentin starts forming in the surface closest to the outside of the tooth and proceeds inward. Cytoplasmic extensions are left behind as the odontoblasts move inward. The unique, tubular microscopic appearance of dentin is a result of the formation of dentin around these extensions.
Tooth enamel is incapable of self-repairing whereas dentin and cememtum can regenerate with limited capacity.
Odontoblasts are specialized cells that produce dentin and exhibit unique morphological characteristics; i.e., they extend cytoplasmic processes into dentinal tubules.
However, judging from the measured hardness values, enamel was considered harder than dentin. Therefore, enamel has higher wear resistance, making it suitable for grinding and crushing foods, and dentin has higher force resistance, making it suitable for absorbing bite forces.
With some variation, most mammalian species have an outer mantle dentin layer, 15–30mm thick, at the periphery of the tooth in the coronal region., , This is mainly an atubular layer, having few thin and curved tubules. .
Circumpulpal dentin. Dentin is produced continuously in adults (4 μm/day) formed by regularly spaced Von Ebner lines appearing as incremental lines, and every 20–24 μm an Owen line is more prominent, implicating the dentin that includes four to six Von Ebner lines.
Tooth enamel is the hardest tissue in the body. Problem is, it’s not living tissue, so it can’t be naturally regenerated. Unfortunately, you can’t regrow it artificially, either — not even with those special toothpastes.