What is Circumpulpal dentin?
What is Circumpulpal dentin?
Circumpulpal dentin is formed before the root formation is completed. Newly secreted dentin is unmineralized and is called predentin. It is easily identified in hematoxylin and eosin stained sections since it stains less intensely than dentin. It is usually 10-47μm and lines the innermost region of the dentin.
What is mineralization of dentin?
A thick dentin layer forms the bulk of dental mineralized dental tissues. Dentin is capped by a crown made of highly mineralized and protective enamel, and in the root, it is covered by cementum, a structure implicated in the attachment of the teeth to the bony socket.
What is Interglobular dentin and how does it form?
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.
What are the 4 main types of dentin?
Dentin classification. Dentin includes primary, secondary, and tertiary dentin. Based on structure, primary dentin is composed of mantle and circumpulpal dentin.
What is reactionary dentin?
Reactionary dentin is formed in response to a carious decay, to excessive abrasion, or to the cytotoxic effects of monomers released by a restorative material. This is how the pulp limits undesirable noxious effects.
When is reparative dentin formed?
Unlike reactionary dentin, which is formed by existing odontoblasts, reparative dentin is formed by odontoblast-like cells presumably differentiated from DPSCs when the pulp becomes exposed and the existing odontoblastic layers are breached.
Why is Interglobular dentin formed?
Interglobular dentin formation, as described in textbooks of dental histology,’ 2 is the result of normal matrix formation but failure of complete fusion of the calcospherites during the calcification period that follows.
Where is Interglobular dentine found?
Typical interglobular dentine was present in coronal dentine in most of the teeth. In the radicular dentin, position and size of the interglobular dentine was different among the teeth examined. Most of the teeth had the interglobular dentine in the cervical part of the roots (type A).
What type of tissue is dentin?
Dentine. Dentine is a yellowish avascular tissue that forms the bulk of a tooth. It is a tough and compliant composite material, with a mineral content of 70% dry weight (largely crystalline hydroxyapatite with some calcium carbonate) and 20% organic matrix (type I collagen, glycosaminoglycans and phosphoproteins).