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35 Cards in this Set

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Stage 1 Dentinogenesis
Lays down organic matrix (pre-dentin)

Thickest pre-dentin is formed at the beginning, near DEJ

Formation always starts at the most coronal part
Stage 2 Dentinogenesis
Mineralization of pre-dentin

Crystals get deposited along direction of collagen fibers
What two proteins play a role in initiation of the mineralization process
Dentin Phosphophoryn Protein (DPP)

Dentin Sialoprotein (DSP)
How does calcium come in and get deposited in dentin?
Ca++ diffuses from the bloodstream into the odontoblast, and then gets secreted out into the organic matrix
calcoglobule
Calficication piece by piece in an asterisk kind of way
Characteristics of Dentin
slightly yellow and darker in color than enamel

more raduiolucent than enamel

more radiopaque than cementum

A living tissue similar to bone

HAP crystals are smaller than in enamel
Dentin makeup
70% inorganic + 20% organic + 10% water
Primary dentin
makes up the bulk of the crown & root

Consists of Mantle, Circumpulpal, Interglobular, Tome's Granular Layer
Mantle Dentin
thin, closest to the DEJ

does NOT contain the Phosphophoryn protein

it’s less mineralized than Circumpulpal Dentin

has branched Korff’s Reticular Fibers

Has collagen fibers

Stains with silver
Which type of dentin does NOT contain the Phosphophoryn protein
Mantle Dentin
Which type of dentin stains with silver
Mantle Dentin
Circumpulpal Dentin
No Korff Fibers

Mostly collagen fibers

contains the Phosphophoryn protein

makes up most of Primary Dentin & all of Secondary Dentin
Which type of dentin makes up all of secondary dentin
Circumpulpal dentin
Interglobular Dentin
Hypomineralized dentin

located in b/t Mantle & Circumpulpal dentin
Tomes Granular Layer
hypomineralized, located near the CDJ and DEJ

When odontoblasts try to move into position towards DEJ, the odontoblastic process gets coiled up reducing amount of HAP present
Secondary Regular Dentin
only gets deposited after primary dentin has finished completion of tooth formation

narrows the pulp chamber

has fewer odontoblasts, fewer processes, fewer tubules when compared to primary dentin
Which areas of the pulp chamber have greater amounts of Secondary Regular Dentin
Roof and floor and horns

Lateral walls have much less
Primary dentinal tubules vs Secondary dentinal tubules
Wavy vs perpendicular to long axis of tooth
Secondary Irregular Dentin
AKA Tertiary Dentin

gets laid down at a local site only when there is a stimulus

causes narrowing of the pulp

forms very rapidly

Includes Reactive and Reparative Dentin
Reactive Dentin
Secondary Irregular Dentin

formed by pre-existing odontoblasts
What dentin is formed by pre-existing odontoblasts
Reactive Dentin
Reparative Dentin
Secondary Irregular Dentin

formed by giving rise to NEW odontoblasts
What dentin is formed by giving rise to NEW odontoblasts
Reparative Dentin
Osteodentin
When Secondary Irregular Dentin forms slowly

Resembles bone

more regular in arrangement, less entrapment of cells
Sclerotic / Transparent Dentin
pre-existing dentin

Modified by the addition by more HAP crystals

see thru it like glass

most mineralized

resembles enamel

Usually forms in roots of older people

Offers protection
Which type of dentin is the most mineralized?
Sclerotic Dentin
Where is the odontoblastic process widest?
Widest where it connects to the cell body

Tapers towards distal end
Intertubular Dentin
makes up most of the dentin

has less fibers

less mineralized
Peritubular Dentin
makes up the outer wall of the dentinal tubule

more fibers

more mineralized
Intratubular Dentin
forms an organic sheath

surrounds the process within the inner wall of the dentinal tubule
What type of dentin makes up the outer wall of the dentinal tubule
Peritubular Dentin
What type of dentin makes up the inner wall of the dentinal tubule
Intratubular Dentin
Contour Lines of Owen
equivalent to the Lines of Retzius in enamel
Neonatal Lines
transition between pre-natal and post-natal dentin

an exaggerated Contour Line of Owen
Von Ebner Lines
equivalent to the Daily Incremental Lines in enamel