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DOH110 > Development and Eruption of teeth > Flashcards

Development and Eruption of teeth Flashcards

1
Q

What are the stages of tooth development?

A

Thinkend band of epithelium

(2 horseshoe shaped bands one for each arch)

Initation stage 6-7weeks

Bud stage 8weeks

Cup stage 9-10weeks

Bell stage 11-12weeks

Appostions stage

Maturation stage

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2
Q

What is the oral epithelia cells in utro?

A

Ectoderm

Outer most layer of cells or tissue of an embryo in early development.

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3
Q

what is the mesenchymal cells?

A

Mesenchymal Stem Cells (MSCs) multipotent stromal cells that can differentiate into a variety of cell types, including osteoblasts.

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4
Q

What is the dental lamina?

A

The dental lamina is a band of epithelial tissue seen in histologic sections of a developing tooth.

And is the first evedence of tooth development

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5
Q

What is a basement membrane? What is the function of the basement membrane?

A

A thin, delicate membrane of protein fibres and mucopolysaccharides separating an epithelium from underlying tissue.

The primary function of the basement membrane is to anchor down the epithelium to its loose connective tissue underneath.

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6
Q

What does dental lamina do?

A

Bridge of epithelial cells connecting the enamel organ to the oral epithelium

This is regarded as the initiation stage.

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7
Q

What happens at the initiation stage?

A
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8
Q

What do the thickened bands give rise to?

A

The vestibular lamina

the dental lamina

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9
Q

What does the vestibular lamina do?

A

The vestibular lamina is responsible for the formation of the vestibule and arises from a group of cells called the primary epithelial band.

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10
Q

What does the Dental lamina do?

A

Forms tooth morphology through complex interaction between cells

Epithelial outgrows at the sites corrosponding to the future deciduous teeth

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11
Q

What is dentogenesis?

A

Initial stages of dentin formation

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12
Q

What is amelogenesis?

A

Initial enamel formation

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13
Q

What is apposition stage?

A

Formation of dental tissue matrix

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14
Q

What is the functional stage?

A

Fully erupted and loaded tooth in the oral cavity

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15
Q

When is pre-dentin mineralized into dentin?

A

In 24 hours

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16
Q

The enamel organ differentiates into what layers?

A

Outer enamel epithelium, inner enamel epithelium, stellate reticulum, and dental follicle or sac

17
Q
A
18
Q

What becomes preameloblasts?

A

Inner enamel epithelium

19
Q

What is stratum intermedium?

A

2-3 cell thick layer of squamous cells

20
Q

What does the presence of preameloblasts cause?

A

Dental papilla cells adj. to them differentiate into odontoblasts and begin to secrete pre-dentin

21
Q

What results due to dentin?

A

Preameloblasts > ameloblasts and secrete amelogenin

22
Q

What do ameloblasts do after enamel of crown is completed?

A

Secrete primary cuticle over new enamel

23
Q

What is hertwig’s Epithelium Root Sheath?(HERS)

A

Is a proliferation of epithelial cells located at the cervical loop of the enamel organ in a developing tooth.

Downward growing band of cells from the root

24
Q

What does hertwig’s root sheath lead to?

A

Cells in dental papilla next to root sheath -> differentiate into odontoblasts and secrete predentin

25
Q

What happens with dentin to the inner cells of Hertwig’s root sheath?

A

It causes them to secrete a thin layer of cementum = intermediate cementum on dentin (always acellular)

Hertwig epithelial root sheath initiates the formation of dentin in the root of a tooth by causing the differentiation of odontoblasts from the dental papilla

26
Q

What is Rests of Malassez or Epithelial rests?

A

Small clusters of epithelial cells that are not resorbed after hertwig’s rooth sheath breaks up

27
Q

Where does the oral epithelium derive from?

A

Ectoderm

28
Q

Where do neural crest cells derive from?

A

Mesenchymal cells

29
Q

What are 3 types of specialized connective tissue that derive from neural crest cells?

A

Pulp

Cementum

Dentin

30
Q

What is morphodifferentiation?

A

Tooth shaping; continuous process divided into different stages

31
Q

What is cytodifferentiation?

A

Cell differentiation into specific cell types giving rise to specific tissues

32
Q

What are the cell types in cytodifferentiation?

A

Ameloblasts

Odontoblasts

Cementoblasts

Fibroblasts

33
Q

Whta do fibroblasts do?

A

Fibroblasts are the predominant cells of the periodontal ligament

Form pulp and PDL’s

DOH110 (7 decks)

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