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Pediatric Dentistry > Lecture 2- Development And Morphology Of Primary Teeth > Flashcards

Lecture 2- Development And Morphology Of Primary Teeth Flashcards

1
Q

What are the 4 stages in tooth development

A

Growth
Calcification
Eruption
Attrition

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2
Q

What are the processes in tooth development during growth

A

Initiation or bud stage
Proliferation of cap stage
Histodifferentiation (early bell stage)
Morphodifferentiation (late bell stage)
Apposition

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3
Q

What is the germ layer that is not usually involved in tooth formation?

A

Endoderm

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4
Q

What germ layer is responsible in formation of enamel, it also stimulates odontoblast and determines crown and root shape

A

Ectoderm

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5
Q

This germ layer forms the dentin, pulp, cementum, pdl and alveolar bone

A

Mesoderm

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6
Q

When does early stages of odontogenesis become evident?

A

6 weeks of life

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7
Q

This is a band of epithelial tissue that is seen in histologic sections of developing tooth and this is also the first evidence of tooth development

A

Dental lamina

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8
Q

Initiation or bud stage occurs when?

A

6 weeks IU

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9
Q

Cap stage or proliferation occurs when?

A

11 weeks IU

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10
Q

It produces the enamel

A

Dental organ

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11
Q

It generates dentin and pulp

A

Dental papilla

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12
Q

It gives rise to cementum and pdl

A

Dental sac

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13
Q

When does early bell stage or histodifferentiation happen?

A

14 weeks IU

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14
Q

It differentiates into amelosblast

A

Inner enamel epithelium

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15
Q

It differentiates into dental papilla

A

Peripheral cells of dental papilla

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16
Q

It forms the hertwig’s epithelial root sheath

A

Inner enamel epithelium and outer enamel epithelium

17
Q

This is the stage where cells find an arrangement that ultimately dictates the final size and shape of tooth

A

Morphodifferentiation - Late bell stage

18
Q

When does morphodifferentiation happen?

A

18 weeks IU

19
Q

What genes induce differentiation of odontoblast

A

Wnt - wingless/ integrated
Runx- runt-related transcription factor
TGFB- transformation growth factor beta

20
Q

What genes induce differentiation of ameloblast?

A

BMP- bone morphogenetic protein
FGF- fibroblast growth factor

21
Q

It is the formation of tissue matrix of the tooth and accounts for the layered appearance of enamel and dentin

A

Apposition

22
Q

It is the influx of mineral salts within the developed tissue matrix

A

Calcification

23
Q

Where does calcification begins in enamel?

A

Cusp tips and incisal edges

24
Q

Calcification of primary teeth (tooth and when)

A

A -14 weeks
D- 15.5 weeks
B- 16 weeks
C- 17 weeks
E- 18 weeks

25
Q

When does emergence of tooth through the gingiva happens (nollas)

A

1/2 or 2/3 of root development (stage 7 and 8)

26
Q

It means wearing away

A

Attrition

Pediatric Dentistry (5 decks)

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