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histology chapter 13
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inner part of the tooth...usually not visible
dentin pulp complex
composition of dentin
70% inorganic matter
20% organic (cells)
10% water
induce outer cells of dental papilla to differentiate into odontoblast
preameloblasts
begin secreting predentin(dentinogenesis)
odontoblasts
T/F: the odontoblasts move away from the DEJ depositing layers of predentin
True
False
true
____covers most of the crown and root
dentin
T/F: only some afferent fibers to a tooth are pain fibers
True
False
false: all afferent fibers to a tooth are pain fibers
during what stage is the mineral content increased in the dentin
maturation
dentin that is more heavily mineralized
Globular
dentin that is less mineralized
interglobular dentin
cellular extensions of the odontoblast
odontoblastic process
? extend form DEJ or CEJ to the pulp chamber
contain odontoblastic process(makes the tubules)
may contain afferent axon
dentinal tubules
channels that carry axons(nerve fibers) To the brain
afferent
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
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
the first layer of dentin to form, it is more tubular than the inner dentin,and more heavily mineralized than inner dentin(circumpupal dentin)
mantle dentin
(covering)
found adjacent to the pulp, forms after mantle dentin most of the dentin in a tooth is this type
circumpupal dentin
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
reparative dentin
tertiary dentin
formed in response to injury and is more irregular than primary or secondary dentin
tertiary dentin
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
this dentin is rare
sclerotic dentin
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
T/F: tubules become filled in over time
True
False
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
this pulp is within the root
radicular pulp
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
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
2 types of pulp stones
attached
unattached
microscopic zones in the pulp
odontoblastic zone
cell free zone(some cells)
cell rich zone(tons of cells)
pupal core(center of pulp)
T/F: the pulp becomes less cellular, more fibrotic, smaller and has less capacity to repair itself
True
False
true
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Author
tigermom23
ID
13847
Card Set
histology chapter 13
Description
histo chapter 13
Updated
2010-04-27T02:39:30Z
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