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oral histology > Odontogenesis > Flashcards

Odontogenesis Flashcards

1
Q

what is odontogenesis

A

Formation of tooth tissues from stem cells originating in the ectoderm

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2
Q

when does Odontogenesis begin

A

6th embryonic week

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3
Q

what parts of the ectoderm are involved in tooth development

A

Epithelium and mesenchyme

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4
Q

what tissue contains stem cells that become the specialized cels that form tooth tissues

A

Odontogenic tissues

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5
Q

Fomation of dentin tissue

A

Dentinogenesis

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6
Q

Formation of enamel tissue

A

Amelogenesis

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7
Q

Formation of Cementum tissue

A

Cementogenesis

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8
Q

Formation of pulp tissue

A

Pulpogenesis

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9
Q

two histologic stages of odontogenesis

A

Epithelial stages

Tooth germ stages

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10
Q

Epithelial stages

A

Epithelial dental lamina stage
Epithelial bud stage
Epithelial cap stage
Epithelial bell stage (enamal organ)

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11
Q

when is the epithelium arranged in 4 distinct layers

A

At the bell stage

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12
Q

what are the epithelial stages based on

A

Histologic shapes of epithelial tissues

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13
Q

what happens in the tooth germ stage

A

the odontogenic and epithelial and mesenchymal tissues combine and cells of each induced specifically to become formative cells of dentin, enamel, cementum and pulp tissues

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14
Q

the 3 parts of the tooth germ and the type of cells that make them up

A

Enamel organ (bell):
Dental papilla: mesenchym
Dental Follicle: mesenchyme

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15
Q

the parts of the tooth germ give rise to

A

specialized cels that form tooth tissues

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16
Q

when does the primary dental lamina stage occur

A

6th embryonic week

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17
Q

what occures in the dental lamina stage

A

2 epithelial invagination in the lower anterior region of the lower jaw (upper happens later in the same week) decend into the ectomesenchyme

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18
Q

what are the 2 bands formed in the primary dental lamina stage

A

Facial: vestibular lamina
Lingual: primary dental lamina

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19
Q

what happens to the vestibular lamina

A

Cell death occurs in the cental of the vestibular lamina leading to the vestibular

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20
Q

what happens to the primary dental lamina

A

Cells arisisng for the dental laminae become the odontogenic epithelial part of a tooth germ

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21
Q

what happens in the epithelial bud stage

A

formation of epithelial buds at the deep end of the dental lamina

22
Q

what is the epithelial bud

A

epithelial knots where a tooth is too be formed at the deep end of the dental lamina

23
Q

what surrounds each epithelial bud

A

Mesenchymal tissue

24
Q

how are epithelial bud cells separated from the primary dental lamina

A

Not separated, they are continuous

25
Q

what separates the vestibular lamina from the the epithelial bud

A

Bands of epithelail cells

26
Q

when do priimary buds form

A

Cental incisors: 6 weeks in utero

Second molar: 8 weeks in utero

27
Q

when do permanent buds from

A

First molar: 4 months in utero
Central incisors: 5 months in utero
Second molar: 10 months postnatally
third molar: 5 years postnatally

28
Q

how do 3rd molars look before year 5

A

look like a cyst

29
Q

where does the secondary lamina form

A

Behind the primary dental lamina

30
Q

why does the secondary dental lamina form

A

there is one for each succedaneous tooth

31
Q

is there a secondary dental lamina for perminant molars

A

NO

32
Q

what does the primary dental lamina give rise to

A

16 epithelial buds (10 primary and 6 permanent)

33
Q

what happens at the cap stage

A

Odontogenic epithelium is in the shape of a cap

34
Q

what is the enamel knock

A

Concentration of epithelial cells of the cap to serve as a signalling center
- determines if the tooth will develop to become and anterior or posterior tooth

35
Q

where is mesenchym in the epithelial cup stage

A

In and outside of the epithelial cup

36
Q

what happens in the epithelial bell stage

A

Epithelial cap undergoes growth and develops into a bell shaped epithelial structure

37
Q

the other name for the peithelial bell

A

Enamel organ

38
Q

layers of the epithelial bell stage from inside to outside

A

Inner epithelial layer
Stratum intermedium epithelial layer
Stellate reticulum epithelial layer
Outer epithelial layer

39
Q

how many secondary dental lamina form in each arch

A

10 in each arch( one for each succidaneous tooth)

40
Q

what does the secondary dental lamina arise from

A

The primary dental lamina (NOT THE ORAL EPITHELIUM)

41
Q

what parts of the tooth germ are vascularized

A

Enamel organ: no
Dental papilla: yes
Dental Follicle: yes

42
Q

what do the inner epithelial cells of the enamal organ differentiate into

A

Ameloblasts

43
Q

what are ameloblasts

A

Specialized epithelial cells

44
Q

what do the ameloblasts and other parts of the enamel organ form after the formation of the enamel is complete

A

a protective strucutre called the reduced enamel epithelium

45
Q

what do the dental papilla stem cells become

A

Odontoblasts, fibroblasts, reserve cells that eventually become the pulp of the tooth

46
Q

what does the dental follicle stem cells become

A

Cementoblasts, fibroblasts, osteoblasts, and reserve cells to become to periodontal ligament of the periodontium

47
Q

how is the enamel organ attached to both mesenchymal parts of the tooth germ

A

Basal lamina

48
Q

the space between the odontoblasts and the ameloblasts

A

the Future Dentinoenamel junction

49
Q

what is the roll of the reduced enamel epithelium

A

Protects the enamel from surrounding connective tissue until the tooth enters the oral cavity

50
Q

what is the cervical loop

A

The rim of the epithelial bell where the inner and outer epithelial layers meet

51
Q

the doubled epithelial layer of the enamel organ

A

Hertwig’s epithelial rooth sheath

52
Q

Roll of hertwigs epithelial root shealth

A

Determines rooth dentin outline

Determines number of root canals of a tooth (NOT ROOTS)

oral histology (14 decks)

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