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19 Cards in this Set
- Front
- Back
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channels through dentinal matrix which contains odontoblastic cell processes
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Dentinal Tubules
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10um next to DEJ (very thin, formed first)
Contains alpha or Korff’s fibers (thick collagen fibers) Induces the formation of ameloblasts (to secrete enamel) |
Mantle dentin
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Most of the dentin surrounding the pulp
Contains beta or thin collagen fibers |
Circumpulpal Dentin
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Dentin immediately surrounding the odontoblastic cell process
Hypermineralized |
peritubular dentin
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Remaining dentin
Dentin that is not directly surrounding odontoblastic cell process |
intertubular dentin
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Not a real structure
Interface or junction between peritubular & intertubular dentin |
sheath of neuman
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Daily deposition of dentinal matrix
Hypomineralized lines perpendicular to the dentinal tubules Equivalent to the rod segments of enamel |
Incremental Lines of von Ebner
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Hypomineralized
Represent major change of physiology during several days of growth Equivalent to the striae of Retzius of enamel |
Contour Lines of Owen
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Hypomineralized line caused by gestation
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neonatal line (in enamel and dentin)
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Found in the crown & root
Hypomineralized areas between globular mineralization fronts |
Interglobular Dentin
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Found in the root along the DCJ
Small hypomineralized spheres Represents the highly branched terminal ends of the odontoblastic cell process |
Granular Layer of Tomes
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Dentin Formed before eruption
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Primary
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Dentin Formed after eruption
Forms slowly throughout life |
Secondary
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Dentin Produced in response to an injury
Odontoblasts form a patch of dentin to protect the pulp Tubules are sparse, irregularly arranged - light Matrix is poorly mineralized; hypomineralized |
Reparative or tertiary
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Area of empty dentinal tubules
Generally result from bacteria invasion |
dead tracts
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Why do the cell processes retreat?
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Odontoblastic cell processes retreat because of bacterial toxins leaving empty spaces
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What is Sclerotic Dentin?
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Hypercalcified dentin directly under the dead tract
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What does Sclerotic Dentin form?
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A protective barrier, fills in hollow tubule (not found in pulp) in between secondary & tertiary dentin
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Sclerotic Dentin and Aging
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Dentinal tubules filled in by the constant production of dentin
Hypermineralized Transparent (can see through the dentin) |
