Tertiary Dentin: Reactionary/Response and Reparativ
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Tertiary Dentin: Reactionary/Response and Reparativ (osteodentin) oral histology
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Tertiary Dentin: Reactionary/Response and Reparativ
- 1. 悋愆惆悋惆 惶悋忰 惺惡惆悋 悴惆 惺惡惆悋 : 悋悋愕 Tertiary Dentin: Reactionary/Response And Reparativ Reparative or tertiary dentin results from pulpal stimulation And forms only at the site of odontoblastic activation. Whether The formation is the result of attrition, abrasion, caries, or re-Storative procedures, this dentin is deposited underlying only Those stimulated areas (Figs. 8-6 and 8-7). It may be deposited Rapidly, in which case the resulting dentin appears irregular With sparse and twisted tubules and possible cell inclusions (Fig. 8-6B to E). Odontoblasts, fibroblasts, and blood cell Have been found in this type of dentin. In contrast, if it is formed slowly because of fewer stimuli, the dentin appears More regular, much like primary or secondary dentin (Figs. 8-6 And 8-7A). Reparative dentin at times resembles bone more Than dentin and is then termed osteodentin (Fig. 8-7C); It is the type of dentin that is formed under an exposure That has a hard-set calcium hydroxide as the pulp capping Medicament. It can also appear as a combination of several Types (Fig. 8-7E). Recent terminology suggests that the term Reactionary/response dentin be used when the original odonto-Blasts function in deposition and that reparative dentin be Used when newly recruited (replacement) odontoblasts begin Depositing dentin. The latter case occurs with a more severe Injury to the tooth, such as a pulp exposure, which then neces-Sitates recruitment of progenitor cells that then differentiate Into new odontoblasts. It is interesting to speculate why the Newly recruited odontoblasts do not recapitulate development And produce mantle dentin but instead produce various other Types of dentin,
- 2. including osteodentin initially and at a much Later time during the pulpal healing sequence, tubular dentin. Perhaps this is because of the urgency of protecting the pulp From further damage and thereby forming a scar,which then Seals the pulp during dentin bridge formation.