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inner part of the tooth...usually not visible
dentin pulp complex
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composition of dentin
- 70% inorganic matter
- 20% organic (cells)
- 10% water
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induce outer cells of dental papilla to differentiate into odontoblast
preameloblasts
-
begin secreting predentin(dentinogenesis)
odontoblasts
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T/F: the odontoblasts move away from the DEJ depositing layers of predentin
true
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____covers most of the crown and root
dentin
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T/F: only some afferent fibers to a tooth are pain fibers
false: all afferent fibers to a tooth are pain fibers
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during what stage is the mineral content increased in the dentin
maturation
-
dentin that is more heavily mineralized
Globular
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dentin that is less mineralized
interglobular dentin
-
cellular extensions of the odontoblast
odontoblastic process
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? extend form DEJ or CEJ to the pulp chamber
contain odontoblastic process(makes the tubules)
may contain afferent axon
dentinal tubules
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channels that carry axons(nerve fibers) To the brain
afferent
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channels that carry axons(nerve fibers) away form the brain
motor nerves
efferent
-
cellular extension of odontoblast
odontoblastic process
-
8 types of dentin
- 1. peritubular dentin
- 2. intertubular dentin
- 3. mantle dintin
- 4. circumpulpal dentin
- 5. primary dentin
- 6. secondary dentin
- 7. tertiary dentin
- 8. sclerotic dentin
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highly mineralized and forms the walls sof the dentinal tubules
pertubular dentin
-
fills in the space between the tubules and is less mineralized than peritubular dentin
intetubular dentin
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the first layer of dentin to form, it is more tubular than the inner dentin,and more heavily mineralized than inner dentin(circumpupal dentin)
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found adjacent to the pulp, forms after mantle dentin most of the dentin in a tooth is this type
circumpupal dentin
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formed BEFORE the completion of the apical foramen
primary dentin
-
formed AFTER the completion of the apical foramen-makes pulp chamber smaller over time
secondary dentin
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reparative dentin
tertiary dentin
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formed in response to injury and is more irregular than primary or secondary dentin
tertiary dentin
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formed in response to chronic caries-the odontoblastic processes die and the tubles fill in with dentin-it has a dark smooth and shiny appearance
sclerotic dentin
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this dentin is rare
sclerotic dentin
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tiny hole at the end of the root of a tooth
apicla foramen
-
growth lines of dentin
dark lines or bands
correspond to growth rings
imbrication lines of Von Ebner
-
formed when several imbrication lines adjoin
neonatal line is most pronounced
demonstrates disturbances in metabolism
contour lines of owen
-
this is found adjacent to the DCJ
only appears granular
only on root surface
tome's Granular layer
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T/F: tubules become filled in over time
true-as one ages the pulp chamber gets smaller
-
provides support maintenance and formation of the dentin
pulp
-
this pulp is with in the crown
coronal pulp
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this pulp is within the root
radicular pulp
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opening at root tip where nerves and vessels enter
apicla foramen
-
secondary openings into the pulp chamber along the lateral surface of the root
accessory canals
-
these make RCT very difficult
accessory canal
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features of the pulp-componets of connectve tissue(cells)
- fibroblast
- odontoblasts
- mesenchymal
- red blood
- white blood
-
contains mostly collagen fibers
pulp
-
has extensive vascular supply,
has a rudimentary lymphatic system
pulp
-
most numerous cells of the pulp
fibroblast
-
2nd most numerous cells of the pulp
odontoblasts
-
masses of dentin within the pulp chamber
pulp stones
-
-
microscopic zones in the pulp
- odontoblastic zone
- cell free zone(some cells)
- cell rich zone(tons of cells)
- pupal core(center of pulp)
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T/F: the pulp becomes less cellular, more fibrotic, smaller and has less capacity to repair itself
true
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