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Dental Anatomy Exam 4 > Chapter 19 > Flashcards

Chapter 19 Flashcards

1
Q

When are the first signs of tooth development seen?

A

By the 6th embryonic week

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2
Q

What is the ā€œUā€ shaped thickening of the epithelium of the primitive oral cavity?

A

The Dental Lamina

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3
Q

What position is the dental lamina found in?

A

in a position corresponding to the future arch-shaped arrangement of the upper and lower teeth.

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4
Q

What happens at the 8th embryonic week?

A

the dental lamina continues to thicken in 10 areas of the upper and 10 areas of the lower arch.

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5
Q

What does the 20 localized thickenings correspond to?

A

The position of the future primary dentition.

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6
Q

What are the 3 stages of the enamel organ?

A
  1. Bud Stage
  2. Cap Stage
  3. Bell Stage
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7
Q

The initial budding from the dental lamina at the 10 thickened areas in each arch is referred to as what?

A

Bud Stage

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8
Q

What is the first stage of development in the enamel organ , that forms the enamel of the teeth?

A

Bud Stage

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9
Q

During the bud stage, where do the cells in the middle of the bud come from?

A

the outer or superficial layers of the epithelium.

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10
Q

During the bud stage, where do the cells in the periphery of the bud come from?

A

the deep or basal layers of the oral epithelium.

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11
Q

What happens when the deepest part of the buds become slightly concave?

A

Cap stage is beginning.

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12
Q

What are the three different components of the Cap Stage?

A

Outer Enamel Epithelium (OEE), Inner Enamel Epithelium (IEE), and the Stellate Reticulum.

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13
Q

What component of the cap stage is the outer most part of the structure?

A

The Outer Enamel Epithelium (OEE)

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14
Q

Outer Enamel Epithelium (OEE)

A

Is the direct continuation of the basal layer of the oral epithelium.

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15
Q

The cells that outline the concavity in the deepest part of the cap stage compose what?

A

the Inner Enamel Epithelium (IEE)

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16
Q

Inner Enamel Epithelium (IEE)

A

Continuous with the OEE cells and also come from the basal layer of the oral epithelium.

17
Q

Where is the Stellate Reticulum located?

A

in the cells between the OEE and the IEE.

18
Q

Where do the Stellate Reticulum originate from?

A

the superficial layers of the oral epithelium.

19
Q

What kind of cells are the Stellate Reticulum?

A

Ectodermal cells

20
Q

What happens when the concavity of the cap grows?

A

It reaches the Bell Stage.

21
Q

What is the fourth layer of Epithelium called?

A

Stratum Intermedium

22
Q

When is the differentiation between the cap stage and the bell stage made?

A

When the fourth layer of epithelium is formed.

23
Q

What is the future outline or form of the crown of the tooth determined by? What stage does this happen in?

A

it is determined by the way in which the cell layers expand as the enamel organ grows; This happens in the Bell Stage.

24
Q

During the Bell stage there are changes in the various cells, particularly the IEE cells, What will this lead to?

A

the production of the enamel.

25
Q

Functions of the Four layers of the Enamel Organ

A
  1. OEE will play a role in attaching the gingiva to the tooth.
  2. Cells of the IEE elongate and change internally to become ameloblast, responsible for actual enamel formation.
  3. Stella Reticulum functions as a cushioned protection for IEE cells and nourishment of the stratum intermedium.
  4. Cells of the stratum intermedium provide nourishment to the IEE cells. They produce protein and may receive products from and provide products for the ameloblasts.
26
Q

What is the small area of condensed cells arising from the mesoderm and located next to or deep to the IEE?

A

Dental Papilla

27
Q

What structure forms the dentin and pulp of the tooth?

A

Dental Papilla

28
Q

What is a Dental Sac?

A

Several rows of flattened cells.

29
Q

What forms the cementum of the tooth, the periodontal ligaments, and some alveolar bone?

A

Dental Sacs

Dental Anatomy Exam 4 (1 decks)

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