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38 Cards in this Set
- Front
- Back
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Odontoblastic process |
Cell processes of odontoblasts extending through thickness of dentin from DEJ |
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Primary odontoblastic process |
Main cell process of odontoblasts |
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Secondary odontoblastic process |
Branches of primary odontoblastic processed at DEJ Lateral branches arising at right angles to primary odontoblastic processes |
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Dentinal tubules |
Main structural element of dentin, small channels extending from DEJ to pulp |
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Main shape of dentinal tubules |
S-curvature: Caries spread faster S-curvature pattern following tubules pulpally & apically |
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Dead tract |
A group of dentinal tubules in which the odontoblastic processes have degenerated |
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Incremental lines of von ebner |
Daily incremental lines in dentin which reflect the normal diurnal activity of odontoblasts |
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Contour lines of owen |
Accentuated dark bands in dentin which represent a disruption in normal activity of odontoblasts |
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Primary dentin |
All dentin formed during tooth development until completion of apical foramen |
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Secondary dentin |
Dentin formed throughout the life of the tooth after completion of apical foramen |
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Mantle dentin |
First few increment of dentin formed next to DEJ/CDJ during tooth development |
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Cirumpupal dentin |
All of dentin excluding mantle dentin |
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Peritubular dentin |
Dentin immediately surrounding the tubules |
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Intertubular dentin |
Main body of dentin located between the tubules |
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Globular dentin |
Zone of dentin that does not mineralize uniformly, refers to the globular appearance of the mineralizing dentin |
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Interglobular dentin |
zone of dentin that does not mineralize uniformly, refers to isolated areas of poorly mineralized dentin in mature dentin |
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Tome’s granular later |
Type of interglobular dentin in peripheral root dentin |
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Sclerotic dentin |
Areas of dentin where the tubules have mineralized by filling with HA crystals Also known as transparent dentin |
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Regular secondary dentin |
More mineralized than primary dentin Abrupt change in direction of tubules, yet neat in arrangement |
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Secondary irregular dentin |
Contains fewer tubules in an irregular arrangement Rapid response to intense stimulus (caries or trauma) Another term is tertiary or reactive dentin |
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What kind of tissue is pulp? |
Non-mineralized, specialized CT Cells, fibers, ground substance, blood vessels, nerves |
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What are two components of CT that are not found in pulp? |
Adipose tissue & elastic fibers |
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Fibroblasts |
Produce the fibrous matrix and ground substance |
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Odontoblasts |
Produce dentin |
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Mast cells |
Reside in vicinity of blood vessels, release granules of histamine |
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Macrophages |
Engulf tissue debris & microorganisms |
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wandering cells |
Leukocytes that migrate from bloodstream to defend pulp when injured |
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Stem cells |
Undifferentiated mesenchymal cells, which can be induced to specialize |
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Most nerves of the pulp are |
Myelinated sensory nerves |
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What is the name of the network of pulpal nerves located below the cell-rich zone? |
Parietal layer of Raschkow |
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What type of tooth sensations are transmitted specifically by the pulp nerves? |
Thermal |
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Five main functions of pulp |
Inductive: initiates early steps in tooth development Formative: contains cells that form tissues Nutritive: rich blood supply to nourish the dentin Sensory: external stimuli evoke a pain response in the nerves Defensive: involved defense reactions of dentin/pulp complex |
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True denticle |
Discrete modular calcifications containing dentinal tubules & having odontoblasts located on surface |
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False denticles |
Discrete modular calcifications consisting of enlarging rings of calcified tissue, no structural elements of dentin |
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Diffuse calcifications |
Small irregular interspersed mineralized areas of the pulp |
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Pulp stones |
True & false denticles |
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What is dentin made up of? |
Specialized CT with mineral component (HA crystals) Cells, fibers, ground substance Avascular |
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How does the application of a whitening agent lead to dentinal hypersensitivity? |
Removes the smear plugs that are in the dentinal tubules |
