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Basic Info > Embryology > Flashcards

Embryology Flashcards

1
Q

Homodont and Heterodont

A

Shape of the tooth
1. homo- all the same
2. hetero - different

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2
Q

Thecodont, acrodont, pleurodont

A

Anchorage of tooth
1. Thecodont - set in sockets
2. Acrodont - ankylosed directly to the bone
3. Pleurodont - grow from pocket

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3
Q

Brachydont, Hypsodont, Radicular hypsodont, Aradicular hysodont

A

Crown Type
1. Brachydont - short crown to root ratio
2. Hypsodont - longer crown to root ratio
3. Radicular hyps - closed roots with continuous eruption
4. Aradicular hyps - open roots with continuous eruption

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4
Q

Secodont, bunodont

A

Cusp type
1. secodont - cheek teeth with cutting cusp
2. Bunodont - cheek teeth with low cusps for grinding

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5
Q

Isognathous, Anisognathous

A

Jaw relation
1. Iso - equal
2. Anis- unequal

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6
Q

Dogs and cats have what kind of dentition

A

Diphydont – 2 sets of teeth
heterodont – diff shape
brachydont – short crown
Secodont - cutting cusp
Thecodont - sockets
Anis - different length

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7
Q

What day does the brachial arch form
What day does the brachial arch become maxilla and mandible
What day are teeth visible

A

Day 21
Day 23
Day 25

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8
Q

The dental papilla and Sac/Follicle become what

A

Papilla – pulp/dentin
Sac – PDL, cementum, alveolar bone

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9
Q

What stage does the stratum intermedium form

A

Bell stage

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10
Q

What are the three steps to tooth development

A

bud, cap, bell
from ectomesenchyme

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11
Q

What is the bud stage

A

budding of the dental lamina which makes the region of the decidous dentition

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12
Q

What happens in the cap stage

A

concavity of the bud
vascular supply
formation of the OEE/IEE/SR

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13
Q

What does the outer enamel epithelium do

A

Protective layer

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14
Q

What does the inner enamel epithelium do

A

Enamel formation

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15
Q

What is the stellate reticulum

A

Cushing and allows for nourishment to IEE

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16
Q

Where does the stratum intermedium form

A

Between IEE and SR

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17
Q

Name the layers

A
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18
Q

The enamel organ, papilla, follicle form what products from what cells

A
19
Q

Enamel – what makes it and what is it made of, when is it formed

A

Ameloblasts via amelogenesis
Hydroxyapatite
formed in late bell stahe

20
Q

What is nasmyth membrane

A

primary enamel cuticle
Protective layer of reduce enamel epithelium that is worn away with chewing

21
Q

What does OEE and IEE become after crown formation

A

Herwigs root sheath

22
Q

What gives rise to rests of malassez

A

Hertwig root sheath if fails to dissolve

23
Q

Most prominent pattern of dentin and enamel (when etching enamel)

A

Enamel - type 1 with rods
Dentin - type 3

24
Q

Dentinogenesis is what

A

formation of dentin

25
Q

What components help form dentin

A

Odontoblasts
Odontoplasts help synthesize type 1 collagen, secrete proteglyceans, collagen, ALKP, eetc

26
Q

what happens once HER contacts papilla

A

Start making odontblast
Hertwig’s epithelial root sheath begins to resolve
Malformation-> accessory or supernumerary root

27
Q

What happens when the dental sac comes into contact with dentin

A

Starts making cementum

28
Q

Where do permeant teeth erupt

A

MN C- lingual
MX C- mesial
Incsiors - lingual
Remainder buccal

29
Q

What are the 3 stages of eruption

A

Preeruptive - end of crown formation
eruptive - root formation
posteruptive - into occlusion

30
Q

What are the 4 eruption theories

A
  1. root - root pushes tooth forward
  2. Bone - bone deposits cause eruption
  3. PDL - PDL dorces push forward (most plausible)
  4. Dental follicle – continued growth causes tooth to erupt
31
Q

Deciduous dentition dog and cat

A

Dog = 28( i3, c1, PM3). doesnt have PM1 as decdisous for maxilla and mandible
Cat = 26 (i3, c1, PM3/2)
Doesnt have molar teeth

32
Q

Tombes fibers

A

Odontoblastic processes through predentin

32
Q

Tomes processess

A

landmark in ameloblasts

33
Q

What are the 6 cellular layers of dentin pulp complex

A

Dentin, predentin, odontoblast, cell free, cell rich, Pulp

34
Q

Dentin is produced by

A

odontoblast

35
Q

Pulp proper

A

Fibroblast
Type I/III collagen
Proteoglycan
GAG

36
Q

Cell rich layer is composed of

A

fibroblasts

37
Q

Cell poor layer is composed of

A

Traversed by capillaries, unmyelinated nerve fibers, cytoplasmic processes of fibroblasts

38
Q

What type of collagen is made by odontoblast vs fibroblast

A

Fibro - I, III, V, VII
Odonto - I

39
Q

Pulpal blood flow

A

Capillaries
Highest in horns, –coronal portion – lowest in root

40
Q

Plexus of Raschkov

A

Nerve plexus in root

41
Q

Most prominant nerve fibers in pulp

A

C fibers
A delta fibers

42
Q

What fibers are stimulated with electric and cold pulp testing

A

A fibers

Basic Info (16 decks)

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