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Oral Biology Exam 1 > Enamel Development > Flashcards

Enamel Development Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

When does the Bud stage occur?

A

6-9 weeks in utero

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2
Q

How many locations does the bud stage or initiatioon occur?

A

10 sites along the dental lamina in each jaw

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3
Q

What is it called when basal layer cells of the epithelium expand into mesenchyme?

A

The bud stage!

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4
Q

When does the cap stage occur and what is it called

A

9-11 weeks in utero, called proliferation!

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5
Q

What are the three parts of the cap stage?

A
  1. enamel organ
  2. Dental papilla = dentine and pulp!
  3. Dental sac = cementum and PDL
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6
Q

The basement membrane separates two things…

A
  1. the inner enamel epithelium from the dental papilla

2. the outer enamel epithelium from the dental sac

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7
Q

what is the dental sac

A

cementum and PDL!

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8
Q

what is stellate reticulum

A

polygonal cells between inner and outer enamel epithelium

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9
Q

What is the essential layer for enamel formation a nd where does it sit?

A

stratum intermedium

sits in between the inner enamel epithelium and the stratum reticulum

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10
Q

When does the bell stage occur and what can it be called

A

11-14 weeks in utero, histodifferentiation!

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11
Q

when is the advanced bell stage?

A

14-18 weeks

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12
Q

what happens in the advanced bell stage?

A

formation of enamel by ameloblasts
formation of dentin by odontoblasts
DEJ forms!

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13
Q

How does dentin form?

A

Formed at the DEJ!!! in the region near the cusps and moves APICALLY!!

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14
Q

Korff Fibers

A

Spiraling fibers that support dentine!

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15
Q

How does enamel form?

A

The ameloblasts lay down enamel OVER the dentin. the enamel formation proceeds CORONALLLY!

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16
Q

What forms Hertwig Epithelial Rooth Sheaths? (HERS)

A

the cervical portion of the enamel organ!

17
Q

When are ameloblasts fully differentiated and secretory?

A

Tomes Process forms!!! this secretes and creates the enamel rod

18
Q

Where does calcification start

A

cusp tips/incisal edge

19
Q

morphodifferentiation

A

seems to be formation of ameloblasts and odontoblasts around DEJ

20
Q

Apposition

A

initial dentin and enamel lay down

21
Q

What stage is disturbed if you have hypodontia or anodontia and which teeth are most likely to be missing?

A

Initiation - Bud stage

3rds, upper laterals, 2nd premolars, lower centrals

22
Q

What stage is disrupted with supernumery stage?

A

Initiation = bud stage

98% inthe maxilla!!!

23
Q

Fusion vs Gemination

A

Fusion - joining of two tooth germs (reduced number of teeth!!)
gemination = two tooth buds from a single tooth germ
(normal number of teeth!)

24
Q

What stage is disrupted if you have gemination or fusion

A

proliferation - cap stage!

25
Q

What stage is disrupted if you have macrodontia, microdontia, dens in dente, dens evaginatus, talon cusp?

A

morphodifferention = bell stage

26
Q

What teeth are dens in dente found?

A

maxillary laterals

27
Q

what teeth are dens evaginatus found?

A

premolars (asians!)

28
Q

What teeth are talon cusps found?

A

maxillary central incisors

29
Q

Hypoplastic amelogenesis imperfecta

A

hard thin enamel

common open bite in the anterior

30
Q

Hypomaturation amelogenesis imperfecta

A

normal thickness of enamel but soft!

31
Q

Hypocalcified Amelogenesis imperfecta

A

normal thickness but friable – anteroir o pen bite common

32
Q

High fever in the first year of life can lead to what?

A

Molar Incisor hypomineralization – localized opacity

usually only incisal or cuspal 1/3

33
Q

Enamel hypoplasia is often caused by what

A

dental trauma to the primary dentition

34
Q

Dentinogenesis imperfecta

A

pulpal obliteration
grey to purple discoleration
primary and perminant dentition
enamel lost early

35
Q

Dentinal Dysplasia (type I and II)

A

Type I = autosomal dominant , short or absent roots, pulp obliterated

type II = pulp obliteration and pulp stone!

Oral Biology Exam 1 (8 decks)

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