Lec 7: Development of Dentition & Nolla's Flashcards

1
Q

The primitive oral cavity is also called as?

A

Stomatodeum

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2
Q

The primitive oral cavity is lined by?

A

Stratified squamous epithelium

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3
Q

The lining of the stomatodeum is called as?

A

Oral ectoderm

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4
Q

The primitive oral cavity establishes connection with the foregut at what week of gestation?

A

4th week

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5
Q

This structure limits the stomatodeum, separating it from the foregut, until it ruptures at 4th week of gestation.

A

Buccopharyngeal membrane

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6
Q

The first indication of tooth formation is seen at what week?

A

6th week of gestation (1st trimester)

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7
Q

At the 6th week, the oral ectoderm proliferate into the underlying ectomesenchyme to form what horseshoe-shaped structure?

A

Dental lamina

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8
Q

The primary teeth develop directly from?

A

Dental lamina

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9
Q

The permanent successor teeth develop from?

A

Successional lamina / lingual extension of dental lamina

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10
Q

The permanent molars develop from?

A

Distal extension of dental lamina

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11
Q

Also known as the lingual extension of the dental lamina.

A

Successional lamina

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12
Q

At this stage, the enamel organ resembles a small bud, surrounded by the condensation of ectomesenchymal cells.

A

Bud stage

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13
Q

During the bud stage, what are the cells seen in the enamel organ?

A
  1. peripherally located low columnar cells
  2. centrally located polygonal cells
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14
Q

At this stage, the enamel organ proliferates to form a cap over the dental papilla. The dental papilla and dental sac become well defined.

A

Cap stage

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15
Q

During the cap stage, the enamel organ differentiates to form three epithelial cells, which are?

A
  1. Inner enamel epithelium
  2. Stellate reticulum
  3. Outer enamel epithelium
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16
Q

In this stage, there is an uneven proliferation of cells, resulting in deepening of the undersurface of the epithelial cap.

A

Early bell stage

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17
Q

What is the layer formed between the IEE and stellate reticulum during early bell stage?

A

Stratum intermedium

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18
Q

How many epithelial cell types does the enamel organ exhibit during early bell stage?

A

4 types

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19
Q

The IEE differentiates into tall columnar cells called?

A

Ameloblasts

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20
Q

These cells secrete enamel.

A

Ameloblasts

21
Q

The peripheral cells of the dental papilla differentiate into?

A

Odontoblasts

22
Q

These cells form dentin.

A

Odontoblasts

23
Q

At this stage, odontoblasts form a layer of dentin and then the ameloblasts begin to secrete enamel matrix.

A

Advance bell stage

24
Q

The deposition of enamel and dentin continues until?

A

Crown formation is complete

25
Root formation begins once the dentin and enamel reach the?
Future cementoenamel junction
26
The cervical portion of the enamel organ gives rise to the?
Hertwig’s epithelial root sheath
27
This structure molds the shape of the roots and initiates radicular dentin formation.
Hertwig’s epithelial root sheath
28
Eruption of a tooth generally begins when __________ of the root is formed.
two-thirds
29
Root formation is usually completed ________ after the eruption of tooth.
1–3 years
30
Physiological process involving the dental lamina and bud stage.
Initiation
31
Physiological process involving the bud and cap stage.
Proliferation
32
Physiological process involving the early bell stage.
Histodifferentiation
33
Physiological process involving the advanced bell stage.
Morphodifferentiation
34
Physiological process involving the formation of enamel and dentin matrix.
Apposition
35
Mineralization begins around at what week of gestation in primary dentition?
14th week
36
Mineralization occurs first in the?
Central incisors
37
The permanent tooth germs begin to form around what month of intrauterine life? and their mineralization commences at ____?, beginning in the ______?
4th–5th month birth first molars
38
Radiographic studies of tooth formation consider what three basic stages?
Beginning of calcification, Crown completion, Root completion
39
Nolla's Stage 1?
Absence of crypt
40
Nolla's Stage 2?
Initial calcification
41
Nolla's Stage 3?
1/3 of crown completed
42
Nolla's Stage 4?
2./3 of crown completed
43
Nolla's Stage 5?
Crown almost completed
44
Nolla's Stage 6?
Crown completed
45
Nolla's Stage 7?
1/3 of root completed
46
Nolla's Stage 8?
2/3 of root completed
47
Nolla's Stage 9?
Root almost completed
48
Nolla's Stage 10?
Apical end of root completed
49
At what stage of Nolla's classification do the eruption of tooth commence?
Stage 8 (2/3 of root completed)