Lecture 2: Histology of Dentin

Less collagen and much more mineralization

Why is enamel tougher and less flexible than dentin?

False

(T/F) Odontoblast processes do not extend into enamel

True

(T/F) Odontoblast processes have lateral branches

Peritubular dentin

Name for dentin immediately surrounding the tubules

Intertubular dentin

Name for dentin not neighboring a tubule directly

Hydroxyapatite

Primary mineral crystal important for intertubular dentin structure

Tubules are wider and diameter as they get closer to the pulp

Why is adhesion better with superficial dentin?

70/20/10%

What percentages is dentin composed of inorganic (mineral), organic, and water matter (in that order)?

True

(T/F) Secondary branches of dentinal tubules connect both neighboring and distant tubules.

When contacts between antagonistic cusps are established

When does construction of secondary dentin begin?

True

(T/F) Construction of secondary dentin continues throughout life.

1. Mild stimulus

2. Low-grade inflammation

3. Odontoblast secretory activity

4. Tertiary dentin formation

What are the stages of reactionary dentinogenesis of tertiary dentin

1. Intense stimulus

2. Rapid/intense inflammation

3. Stem/progenitor cell recruitment (odontoblast damage)

4. Odontoblast-like cell differentiation

5. Odontoblast secretory activity

6. Tertiary dentin formation

What are the stages of reparative dentinogenesis of tertiary dentin

Sclerotic dentin

Dentin that has become translucent due to calcification of the dental tubules

Hybrid layer

Intermediate layer of hydrophilic resin infiltrated in demineralized dentin