Dentinogenesis Flashcards
What is dentin made up of in what percentages?
70% Hydroxyapatite crystals
20% Collagen fibers
10% Water
What is primary and secondary dentin?
Primary: Dentin formed pre-eruption
Secondary: Dentin formed post-eruption
What is the first primary dentin formed? What kind of fibers is it made of?
Mantle dentin . Large colllagen fibers.
What is the layer just superficial to the mantle dentin? What is it made up of? What kind of dentin?
Interglobular or Globular Dentin. Made up of calcospheres (spheres that are highly calcified). Primary dentin.
What layer is just superficial to the Globular dentin? What fibers is it made up of? What kind of dentin?
Circumpulpal dentin. Made up of smaller collagen fibers. primary dentin.
What is tertiary dentin?
Dentin produced in response to stimuli.
What cells make dentin? How long do they produce it?
Odontoblasts. Functional for life.
What is predentin?
Unmineralized newly formed dentin at pulpal border.
What phases is dentin made?
- Predentin made from organic material
2. predentin mineralized to form dentin.
Which way do odontoblasts move as they lay down dentin?
Pulpally.
What is the odontoblastic process? Where does it extend? travels through?
The cellular extention of the odontoblast. Extends through the predentin, dentin, and even enamel. Travels through the future dentitial tubules.
What are enamel spindles?
Extensions of the odontoblastic process that pass into the inner enamel.
What is the peritubular dentin and intertuubular dentin?
Peritubular=hypermineralized found on outer edges of the odontoblast.
Intertubular=Primary product, lies between tubules.
Describe circumpulpal dentin mineralization vs globular?
Circumpulpal=Uniform and slow
Globular=Not unifrom, fast.
How does the dentin mineralize?
Odontoblast release matrix vesicles containing hydroxyapetite crystals. they rupture, and crystal grow and fuse with one another.
