Dental Morphology

Question 1

root formation will begin at the cervical loop when what is completed

Answer 1

the crown

Question 2

when enamel formation reaches the cervical loop, what will begin

Answer 2

root formation

Question 3

as soon as the crown is completed, what will the crown do

Answer 3

it will start to erupt

Question 4

an extension of the cervical loop that has an infolding of the epithelial sheath is what

Answer 4

root sheath

Question 5

an infolding of the epithelial sheath is called the

Answer 5

epithelial diaphragm

Question 6

cells of the OEE and IEE at the cervical loop proliferate and form the

Answer 6

Epithelial Rooth Sheath (ERS)

Question 7

another name for the epithelial root sheath (ERS) is the

Answer 7

Hertwig’s root sheath

Question 8

the epithelial diaphragm is part of the

Answer 8

Epithelial Rooth Sheath (ERS)

Question 9

when the root sheath extends, it breaks up and lets the ectomesenchyme reach the dentin and deposit

Answer 9

cementum

Question 10

The Epithelial Rooth Sheath (ERS) induces formation of ________ and _________ formation

Answer 10

odontoblasts ; dentin

Question 11

as root dentin is formed, tooth begins

Answer 11

eruptive movement

Question 12

cementoblasts deposit

Answer 12

cementum

Question 13

during root development and eruption, portions of the Epithelial Rooth Sheath (ERS) are seen as fragments along the

Answer 13

side of the root

Question 14

the broken remnants of Epithelial Rooth Sheath (ERS) are called what 2 names?

Answer 14

Epithelial Rests OR Epithelial Cells Rests of Malassez

Question 15

Epithelial Rests aka Epithelial Cells Rests of Malassez can be used as

Answer 15

stem cells to originate other tissues

Question 16

root dentin induces cells of the dental follicle to differentiate into

Answer 16

cementoblasts (forming cementum)

Question 17

cells of the dental follicle will begin to form the

Answer 17

PDL

Question 18

as soon as we have formation of roots, we see fibroblasts in the space derived from ____________ which will organize themselves into collagen fibers which will be the origin of _______

Answer 18

ectomesenchyme ; PDL

Question 19

fibroblasts derived from ectomesenchymal tissue of the dental follicle will synthesize collagen for the

Answer 19

PDL

Question 20

extensions of the epithelial root sheath (ERS) will subdivide the _________, providing _______ to develop

Answer 20

apical foramen ; multiple roots

Question 21

furcation is determined by where the ___________ meet

Answer 21

epithelial diaphragms

Question 22

what forms when there is an opening in the epithelial root sheath (ERS) that allows for contact of the ectomesenchyme outside of the tooth and ectomesenchyme inside the pulp cavity (this is due to a failure of root dentin formation)

Answer 22

accessory root canals

Question 23

what pathology?

when the epithelial diaphragm fuses very low and you have a LARGE pulp cavity and very short roots and usually has relatively weak anchoring to the alveolar bone

Answer 23

taurodontia

Question 24

simple teeth will have fewer _____ than complex teeth

Answer 24

roots

Question 25

soft tissue is always _____ when compared to hard tissue

Answer 25

1st

Question 26

primary vasculature is directed to

Answer 26

major cusps

Question 27

_____ controls crown shape

Answer 27

enamel knot

Question 28

teeth that do NOT have replacement

Answer 28

molar

Question 29

primary dentition formula

Answer 29

I 2/2 C 1/1 M 2/2 =10

Question 30

permanent dentition formula

Answer 30

I 2/2 C 1/1 P 2/2 M 3/3 =16

Question 31

all teeth derive from the

Answer 31

dental lamina

Question 32

molars originate by a ____ extension of the _______ from the last ________

Answer 32

posterior ; dental lamina ; premolar

Question 33

premolars originate from

Answer 33

back to front

Question 34

incisors originate from

Answer 34

front to back

Question 35

molars originate from

Answer 35

front to back

Question 36

example: i2 is dependent on ___ to originate

Answer 36

i1

Question 37

If you damage M2, will you still have M1? What about M3?

Answer 37

M1 - yes M3 - no

Question 38

If you damage premolar 1, will premolar 2 be okay?

Answer 38

yes, premolar 2 will be fine because it is already developed before premolar 1

Question 39

If you damage premolar 2, will premolar 1 be okay?

Answer 39

No, if you damage PM2 you will not have PM1 because premolars originate from back to front

Question 40

few missing teeth

Answer 40

hypodontia

Question 41

no teeth

Answer 41

anodontia

Question 42

peg laterals

Answer 42

microdontia

Question 43

giant teeth

Answer 43

macrodontia

Question 44

a condition of supernumerary teeth (extra teeth)

Answer 44

hyperdontia

Question 45

2 crowns develop from a single enamel organ/root

Answer 45

gemination

Question 46

2 teeth that fuse together

Answer 46

fusion

Question 47

when the root sheath gets fused together through the cementum of the roots

Answer 47

concrescence

Question 48

trauma that causes angulation between the crown and root

Answer 48

dilaceration

Question 49

enamel in the root

Answer 49

enamel pearl

Question 50

what results when cells of the root sheath remain adherent to developing dentin and induce enamel formation

Answer 50

enamel pearl

Question 51

when the root sheath doesn't detach and allow cells from ectomesenchyme to get behind and produce cementum

Answer 51

enamel pearl

Question 52

fluid filled remnants of the REE seen in infants

Answer 52

gingival cysts

Question 53

The root of the tooth is comprised of

Answer 53

dentin

Question 54

cells of the IEE induce the differentiation of odontoblasts in crown formation and they will also induce differentiation of odontoblasts for ______

Answer 54

root formation

Question 55

cells of the IEE and OEE proliferate at the cervical loop proliferate to form a double layer of cells known as

Answer 55

Hertwigs epithelial root sheath

Question 56

Hertwigs epithelial root sheath encloses the primary ______

Answer 56

apical foramen

Question 57

cells of the dental papilla which neighbor the IEE cells differentiate into

Answer 57

odontoblasts

Question 58

as root formation begins, the tip of the root remains essentially _______ the crown of the tooth begins to move _______ towards the oral cavity

Answer 58

stationary (it does not grow deeper) ; vertically

Question 59

as the root lengthens and the crown moves vertically, portions of the root sheath are stretched --> the sheath surrounding the root becomes fragmented and separated from the root dentin --> clusters of epithelial cells along the root surface are known as

Answer 59

epithelial cell rests of Malassez

Question 60

what forms from the fragmentation of the epithelial root sheath occurs and root dentin is exposed to ectomesenchymal cells of the dental follicle

Answer 60

cementum

Question 61

ectomesenchymal cells at the periphery of the dental follicle differentiate into osteoblasts which produce

Answer 61

osteoid

Question 62

During development we have ___ placodal precursors for the four families along the dental lamina: incisor, canine and postcanine precursor

Answer 62

3

Question 63

when the epithelial cells of the root sheath fail to detach from the developing root aka they remain adhered - what does this create

Answer 63

exposed root dentin

Question 64

when epithelial cells of the root sheath in the cervical area near a furcation area remain adherent to developing root dentin and induce the formation of ameloblasts and enamel - what is formed?

Answer 64

enamel pearls

Question 65

foundational tissues

Answer 65

dentin + enamel

Question 66

changing shape of cusp depends on rate of _______ deposition

Answer 66

ameloblast

Question 67

what integrates dentin

Answer 67

calcospheric deposits

Question 68

rodless enamel is ____ and is ALWAYS by the ____

Answer 68

first ; DEJ

Question 69

% of inorganic material of dentin % of inorganic material of enamel

Answer 69

dentin - 70% enamel - 96%

Question 70

calcospheric deposits allows for mineralization of

Answer 70

dentin

Question 71

you need to have a complete _____ to begin root formation

Answer 71

crown

Question 72

the epithelial diaphragm constricts _____ and can subdivide to create more ____

Answer 72

pulp ; roots