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Tertiary dentin (including reparative dentin or sclerotic dentin) is a form of dentin, one of the main component materials of teeth. It forms as a reaction to stimulation, including caries , wear and fractures . [ 1 ]
Cross-section of a tooth. B is dentin. Dentin (/ ˈ d ɛ n t ɪ n / DEN-tin) (American English) or dentine (/ ˈ d ɛ n ˌ t iː n / DEN-teen or / ˌ d ɛ n ˈ t iː n / DEN-TEEN) (British English) (Latin: substantia eburnea) is a calcified tissue of the body and, along with enamel, cementum, and pulp, is one of the four major components of teeth.
Tertiary dentin can be 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 is so severe that it damages a part of the primary odontoblast layer.
In the case of reparative dentin, other cells are needed to assume the role of the destroyed odontoblasts. Growth factors, especially TGF-β, [85] are thought to initiate the production of reparative dentin by fibroblasts and mesenchymal cells of the pulp. [86] Reparative dentin is produced at an average of 1.5 μm/day, but can be increased to ...
Bankrate’s Side Hustles Survey discovered that more than one-third (36 percent) of U.S. adults earn extra money beyond their main source of income through a side hustle. While gig work, like ...
Dentin formation, known as dentinogenesis, is the first identifiable feature in the crown stage of tooth development. The formation of dentin must always occur before the formation of enamel. The different stages of dentin formation result in different types of dentin: mantle dentin, primary dentin, secondary dentin, and tertiary dentin. [31]
On a chilly day, there’s nothing more comforting than curling up under a cozy blanket with a warm cup of tea. But tea offers much more than just comfort and hydration in cold weather.
Maps and electoral vote counts for the 2012 presidential election. Our latest estimate has Obama at 275 electoral votes and Romney at 206.