Dentin and Pulp Flashcards
The dentin supports the ________ and ______.
Enamel crown and roots of teeth
Within the dentin is _______.
Pulp cavity which is the living part of the tooth (alive cells)
Highly vascularized and innervated.
In enamel, the inner portion of the enamel organ differentiates into ameloblasts. What happens for the dentin precursor?
The dental papillae differentiate into odontoblasts.
Mineralization of dentin is similar to ______ and less than _____.
What properties does this give dentin?
Bone, Enamel
Elasticity (mechanically supports harder overlying enamel)
Tight Scalloped DEJ
Cementum and DEJ is less distinct
Dentin is made of how much
Inorganic material.
Organic material
Water
70% Inorganic (mineralized calcium hydrozyapatite crystals)
20% organic material (Type 1 ,3,4 collagen and non collagenous matrix proteins)
10% Water
What is the ___% organic material of dentin made up of?
20%
Type 1 collagen: Forms scaffold for mineral
Type 3 Collagen: First Secreted to make the pre-dentin matrix
Type 4 collagen
Non-Collagenous matrix proteins
What are the 3 types of dentin?
Primary
Secondary
Tertiary
What is primary dentin?
Circumpulpal - Dentin around pulp cavity
Peritubular
Intertubular
Mantle - DEJ - First dental laid down
What is secondary dentin?
Deposited after root formation
What is tertiary dentin?
Reparative dentin formed in reaction to caries and dental procedure
What is the first dentin laid down? What is laid second?
- Mantle dentin (forms DEJ)
- Circumpulpal Dentin
These two together make up primary dentin
What is the final dentin added?
Secondary layer after root formation that can occur even after tooth is growing since roots are growing them
A majority of dentin is made of _________.
Primary Circumpulpal dentin structure with peritubular and intertubular dentin.
There are tubules in circumpulpal dentin that run from the pulp cavity up to the enamel. Within them are odontocyte processes that lead into the pulp where odontocytes live.
Peritubular dentin surrounds these odontocyte process holding tubule
Intertubular dentin fills the space between each peritubular dentin surrounded tubule.
Where do odontocytes live?
Along the secondary dentin. They SHOULD NOT be in pulp.
Primary dentin, secondary dentin and tertiary dentin all contain odontocytes/blasts. True or false
FALSE
Primary does NOT. It does contain odontoblast processes in its tubules
Peritubular and Intertubular dentin are ________ mineralized.
Where are they located?
Highly
Peritubular- Wall of tubule
Intertubular- Between tubules
Primary Dentin is made of ____________ and is formed before completion of the ________.
What it its rate of deposition and mineralization?
Circumpulpal Dentin ( Peritubular + Intertubular dentin) + Mantle Dentin (First layer of dentin ever)
Apical foramen
Rapid formation, high mineralization
Secondary dentin is formed after the ____________ and is the ______layer.
What it its rate of deposition and mineralization?
completion of apical foramen
final
slow formation, low mineralization
Tertiary dentin is found as a ____________.
What does it look like?
result of localized injury to exposed dentin
irregular course of tubules
Tertiary dentin is cellularized. True or false?
True
Remember enamel spindles from enamel lecture! Where do they come from?
Enamel spindles are actually the distal end of odontoblast processes that are protruding out of the DEJ from the pulp.
Most of the dentin matrix is made of _________.
How are odontoblast processes held together?
Intertubular dentin
Canaliculus connecting different odontoblastic processes.
Pre-dentin is secreted at a rate of about ________.
It is mineralized or unmineralized ?
What is it made of?
4 micrometers a day
unmineralized
Collage Type I ( Low 3 and 5), dentin phosphoprotein, substratum for mineralization, odontoblasts secrete collagen
What secretes collagen _____ in the predentin?
1 (3,5)
Odontoblasts
Non-collagenous Matrix Proteins
KNOW FOR EXAM
- Dentin Phosphoprotein/phosphophoryn
- Dentin sialoprotein
- Dentin glycoprotein
- Dentin matrix protein
- Osteonectin - BONE PROTEIN
- Bone sialoprotein - BONE PROTEIN
- Osteopontin - BONE PROTEIN
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