Development of Dentin Flashcards
What kind of development is dentin?
Mesodermal development
What kind of development is pulp?
Mesodermal development
Describe the general timeline of dentin development
Bud, cap, bell
Describe the general timeline of pulp development
Bud, cap, bell
What also happens during the bud stage of the enamel organ?
Toward the end, mesenchymal cells become more rounded and condensed forming dental papilla cells
What happens during the cap stage of the enamel organ?
- Dental papilla cells continue to replicate
- Cells become flattened and begin to appear at the base of the papilla, together they form the dental sac
- VAN develops
- Dental papilla determines the shape of the crown
What happens during the bell stage of the enamel organ?
Dental papilla fills in completely
When do mesenchymal cells become more rounded and condensed to form dental papilla cells?
End of the bud stage in enamel
When do dental papilla cells continue to replicate?
Cap stage of enamel
When is the dental sac formed?
Cap stage of enamel
What makes up the dental sac?
Cells at the base of the dental papilla
When do nerves and blood vessels develop in dentin?
Cap stage of enamel
When and how is the shape of the crown determined?
When: Cap stage of enamel
How: Dental papilla
When does the dental papilla fill in completely?
Bell stage of enamel
Where do odontoblasts come from?
Peripheral cells of dental papilla change shape
What happens when peripheral cells of dental papilla change shape?
They become odontoblasts
What do odontoblasts secrete?
The dentin matrix
What is the dentin matrix made of?
Mucopolysaccharide and collagen fiber matrix
What is the function of the dentin matrix?
Barrier that cuts off flow to the preameloblasts
Describe how the odontoblast travels
Inward towards the pulp
What is the tail of the odontoblast called?
Odontoblastic process
What is the odontoblastic process?
The tail of the odontoblast
Where does the odontoblastic process reach to and from?
From the DEJ to the odontoblast cell body
What is intertubular dentin?
Dentin matrix surrounding the odontoblastic process
Dentin matrix that surrounds the odontoblastic process grows, becomes calcified, and forms what?
Intertubular dentin
What is the peritubular dentin?
Highly calcified dentin that fills in the gaps between the intertubular dentin and the odontoblastic process
What happens when the odontoblastic process begins shrinking?
Peritubular dentin fills in the gap between the intertubular dentin and the odontoblastic process
What is the name of highly calcified dentin that fills in the gap between the intertubular dentin and the odontoblastic process?
Peritubular dentin
What is the dentinal tubule?
Hollow space inside the peritubular dentin
What is the hollow space inside the peritubular dentin?
Dentinal tubule
The odontoblastic process is found inside of what structure?
Dentinal tubule
What is inside the dentinal tubule?
Odontoblastic process
Where do odontoblast cell bodies lie?
Why?
Outside the calcified dentin, lining the inside of the dentin and the outside of the pulp. So that they can keep making dentin.
