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Clarke- Dentin and Pulp
Dentin and Pulp
49
Anatomy
Professional
10/21/2012

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Cards

Term
What percent of dentin is mineralized? Organic? Water?
Definition
70 % mineralized
20% organic
10% water
Term
What is dentin's main job?
Definition
to protect the pulp
Term
What is dentinogenesis?
Definition
the formation of dentin
Term
What is predentin(Mantle dentin) laid down by?
Definition
odontoblasts
Term
What is predentin initially made of?
Definition
collagen fibers and ground substance
Term
What remains behind as odontoblasts retreat away from the DEJ?
Definition
a cytoplasmic extension
Term
As more dentin is made what happens to the pulp chamber?
Definition
it gets smaller
Term
What is the only sensation we have in our teeth?
Definition
pain
Term
When does mineralization or maturation of dentin occur?
Definition
soon after apposition
Term
What are the two phases of mineralization for dentin?
Definition
1.primary phase
2.secondary phase
Term
What happens in the primary phase of mineralization of dentin?
Definition
calcium hydroxyapatite crystals form as globules in the collagen fibers of the predentin, they expand and fuse
Term
What happens in the secondary phase of mineralization of dentin?
Definition
new crystals form layered on the initial crystals. They expand but don't fuse completely to one another
Term
What is globular dentin?
Definition
areas where primary and secondary mineralization occurred, complete crystalline fusion
Term
What is interglobualr dentin?
Definition
areas where only primary mineralization occurred, less mineralized
Term
What are the components of mature dentin? (4)
Definition
1.dentin tubules
2.dentinal fluid
3.odontoblastic process
4.afferent neurons
Term
What are dentin tubules?
Definition
extend from DEJ or DCJ to outer wall of the pulp
Term
What is the dentinal fluid?
Definition
tissue fluid surrounding the cell membrane of the odontoblastic process
Term
What are odontoblastic processes?
Definition
long, cellular extension of the odontoblasts cell body occupying the tubule
Term
What are afferent neurons?
Definition
associated with odontoblastic process, involved in pain sensation
Term
What are the two types of dentin?
Definition
1.peritubular dentin
2.intertubular dentin
Term
What is peritubular dentin?
Definition
highly mineralized, creates the wall of the tubules
Term
What is intertubular dentin?
Definition
found betweek the tubules, not as mineralized as the peritubular.
Term
Which type of dentin makes up the bulk of dentin?
Definition
intertubular dentin
Term
What is mantle dentin?
Definition
the 1st dentin formed, closest to enamel or cementum
Term
What is circumpulpal dentin?
Definition
dentin around the pulpal wall
Term
What is primary dentin?
Definition
forms before tooth erupts, more mineralized
Term
What is secondary dentin?
Definition
forms after eruption and throughout life, less mineralized
Term
What is reparitive(tertiary) dentin?
Definition
forms in response to injury like recession
Term
What is sclerotic dentin?
Definition
a form of tertiary dentin seen in response to chronic injusy
Term
WHat happens to odontoblastic process when sclerotic dentin is formed? What fills tubules?
Definition
it dies, substances like peritubular dentin fill the tubules
Term
What are inbrication lines of von Ebner?
Definition
incremental lines that show the daily apposition of dentin formation
Term
What are contour lines of Owen?
Definition
a number of inbrication lines that demonstrate a disturbance in formation(neonatal line)
Term
What is Tome's granular layer?
Definition
poorly calcified dentin found near the DCJ
Term
What changes in dentin as we age?
Definition
-Tubules become narrorer as deposition of peritublar dentin continues
-continued deposition of secondary dentin
-stimuli not transmitted as well when we get older
Term
What does pulp form from?
Definition
the central cells of the dental papilla
Term
What percentaage organic is pulp?
Definition
100%
Term
What is pulp's functions?
Definition
1.nourishment
2.sensory
3.protective(contains white blood cells)
4.formative(odontoblasts)
Term
What is the shape of the pulp chamber?
Definition
corresponds to the shape of the tooth
Term
Where is the coronal pulp located?
Definition
at the crown
Term
Where is the radicular pulp located?
Definition
at the root areas
Term
What is the apical foramen?
Definition
the opening at the pulp apex
Term
What are accessory canals?
Definition
extra openings
Term
How many pulp horns do teeth have?
Definition
one for every cusp
Term
What are the most numerous types of cell in the pulp? The second most? Other types?
Definition
1.fibroblasts
2.odontoblasts

also have WBC's, nerves, collagen fibers
Term
What are the microscopic zones of pulp? (4)
Definition
1.odontoblastic layer
2.cell-free zone
3.cell-rich zone
4.pupal core
Term
How does pulp change with age?
Definition
pulp fills more with collagen, decreasing the amount of water, intracelular substance, and cells
Term
What happens to the pulp chamber and canal as we age? Why?
Definition
the become smaller because of secondary dentin formation
Term
What can develop in the pulp with age?
Definition
pulp stones
Term
What are pulp stones?
Definition
dentin+tubules and odontogenic processes
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