Embryology

Question 1

Homodont and Heterodont

Answer 1

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

Question 2

Thecodont, acrodont, pleurodont

Answer 2

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

Question 3

Brachydont, Hypsodont, Radicular hypsodont, Aradicular hysodont

Answer 3

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

Question 4

Secodont, bunodont

Answer 4

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

Question 5

Isognathous, Anisognathous

Answer 5

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

Question 6

Dogs and cats have what kind of dentition

Answer 6

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

Question 7

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

Answer 7

Day 21
Day 23
Day 25

Question 8

The dental papilla and Sac/Follicle become what

Answer 8

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

Question 9

What stage does the stratum intermedium form

Answer 9

Bell stage

Question 10

What are the three steps to tooth development

Answer 10

bud, cap, bell
from ectomesenchyme

Question 11

What is the bud stage

Answer 11

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

Question 12

What happens in the cap stage

Answer 12

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

Question 13

What does the outer enamel epithelium do

Answer 13

Protective layer

Question 14

What does the inner enamel epithelium do

Answer 14

Enamel formation

Question 15

What is the stellate reticulum

Answer 15

Cushing and allows for nourishment to IEE

Question 16

Where does the stratum intermedium form

Answer 16

Between IEE and SR

Question 17

Name the layers

Answer 17

Question 18

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

Answer 18

Question 19

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

Answer 19

Ameloblasts via amelogenesis
Hydroxyapatite
formed in late bell stahe

Question 20

What is nasmyth membrane

Answer 20

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

Question 21

What does OEE and IEE become after crown formation

Answer 21

Herwigs root sheath

Question 22

What gives rise to rests of malassez

Answer 22

Hertwig root sheath if fails to dissolve

Question 23

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

Answer 23

Enamel - type 1 with rods
Dentin - type 3

Question 24

Dentinogenesis is what

Answer 24

formation of dentin

Question 25

What components help form dentin

Answer 25

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

Question 26

what happens once HER contacts papilla

Answer 26

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

Question 27

What happens when the dental sac comes into contact with dentin

Answer 27

Starts making cementum

Question 28

Where do permeant teeth erupt

Answer 28

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

Question 29

What are the 3 stages of eruption

Answer 29

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

Question 30

What are the 4 eruption theories

Answer 30

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

Question 31

Deciduous dentition dog and cat

Answer 31

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

Question 32

Tombes fibers

Answer 32

Odontoblastic processes through predentin

Question 32

Tomes processess

Answer 32

landmark in ameloblasts

Question 33

What are the 6 cellular layers of dentin pulp complex

Answer 33

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

Question 34

Dentin is produced by

Answer 34

odontoblast

Question 35

Pulp proper

Answer 35

Fibroblast Type I/III collagen Proteoglycan GAG

Question 36

Cell rich layer is composed of

Answer 36

fibroblasts

Question 37

Cell poor layer is composed of

Answer 37

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

Question 38

What type of collagen is made by odontoblast vs fibroblast

Answer 38

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

Question 39

Pulpal blood flow

Answer 39

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

Question 40

Plexus of Raschkov

Answer 40

Nerve plexus in root

Question 41

Most prominant nerve fibers in pulp

Answer 41

C fibers A delta fibers

Question 42

What fibers are stimulated with electric and cold pulp testing

Answer 42

A fibers