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Dental Tissues: Dentin, Pulp & Enamel > Dentin > Flashcards

Dentin Flashcards

1
Q

What is the origin of Dentin?

A

Outer cells of the dental papilla; mesoderm.

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2
Q

How is dentin formed?

A
  1. Collagenous matrix from odontoblasts.

2. Maturation through mineralization (+hydroxyapatite)

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3
Q

How long does the formation of dentin continue?

A

As long as the tooth is vital.

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4
Q

Can dentin formation be stimulated by the environment?

A

Yes

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5
Q

How is dentin formation stimulated by the environment?

A
  1. Cutting away dentin near the DEJ stimulates odontoblasts.

2. Heavy handed scaling; removing all the cementum from root surface to stimulate tertiary dentin formation.

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6
Q

What percentage of dentin is inorganic, organic, and water?

A

70% inorganic
20% organic (collagen
10% water

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7
Q

What is the function of Dentin?

A

“Shock Absorber” most of the tooth is made up of dentin.

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8
Q

What color is dentin?

A

yellow

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9
Q

What type of union is made with the DEJ?

A

Scalloped

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10
Q

Where are accessory foramina and Lateral canals found?

A

In the root portion of the tooth.

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11
Q

What is the purpose of accessory foramina and lateral canals?

A

Transmits nervous/circulatory elements to the pulp proper of the tooth.

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12
Q

What are the three components of mature dentin?

A
  1. Dentinal tubules
  2. Odontoblastic processes
  3. Dentinal permeabilty.
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13
Q

What is the orientation of dentinal tubules?

A

Travel from the pulp to the DEJ.

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14
Q

What does the dentinal tubules contain?

A

Water, odontoblastic processes and sensory neurons.

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15
Q

What is the correct unit for dentinal permeability?

A

tubules/mm^2

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16
Q

What happens to odontoblasts as dentin is being formed?

A

Odontoblasts squeeze together to create a cross section that is about 20,000 tubules/mm^2.

17
Q

How does the cross section change as you get closer to the pulp?

A

The cross section grows to about 45,000 tubules/mm^2

18
Q

What are the types of dentin?

A
  1. Peritubular
  2. Intertubular
  3. Circumpulpal
19
Q

What is the purpose of peritubular dentin?

A

Creates the walls of the dentin tubules.

20
Q

What is intertubular dentin?

A

Dentin between tubules (least mineralized)

21
Q

What is the purpose of circumpulpal dentin?

A

Surrounds the pulp chamber.

22
Q

Which type of dentin is the deepest in orientation, peritubular, intertubular, or circumpulpal?

A

Circumpulpal

23
Q

What are the three types of dentin based on formation?

A

Primary
Secondary
Tertiary

24
Q

How is primary dentin formed?

A

Formed before closing of the apical foramen (matrix)

25
Q

Where is secondary dentin formed?

A

Deposited at the pulpal periphery of the after the root is completed.

26
Q

When is tertiary dentin formed?

A

In response to noxious stimuli (iatorgenically:dentist or by dental caries)

27
Q

How is primary dentin mineralized?

A

Via odontogenesis

28
Q

How secondary dentin mineralized?

A

After primary dentin is mineralized, a second layer mineralizes over top with some areas of fusion.

29
Q

What is globular dentin?

A

Complete fusion of crystals from both primary and secondary mineralization.

30
Q

What is interglobular dentin?

A

Dentin closer to the DEJ; less calcified and mineralized.

31
Q

What are the 4 main microscopic features of dentin?

A
  1. Imbrication lines of vonEbner
  2. Contour lines of Owen
  3. Neonatal line
  4. Granular layer of Tomes
32
Q

What microscopic feature of dentin is associated with the trauma of birth?

A

Neonatal line

33
Q

What microscopic feature of dentin is associated with daily difference in apposition/maturation?

A

Imbrication lines of vonEbner

34
Q

What microscopic feature is located just deep to the CDJ and CEJ and is less calcified?

A

Granular layer of Tomes

35
Q

What microscopic feature of dentin is associated with trauma?

A

Contour lines of Owen

36
Q

Which microscopic feature of dentin is the most obvious?

A

Neonatal Line

37
Q

How is the Granular Layer of Tomes formed?

A

Via the process of maturation; you get less maturation during the first couple days of dentinogenesis therefore creating a line when more maturation occurs later in development.

Dental Tissues: Dentin, Pulp & Enamel (2 decks)

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