odontogenesis

Question 1

tooth:

Answer 1

enamel
dentin
cementum
pulp

Question 2

periodontium

Answer 2

gingiva
periodontal ligament
cementum
alveolar bone proper

Question 3

stages of tooth development:
1
2
3
4
5
6

Answer 3

1. initiation
2. bud stage
3. cap stage
4. bell stage
5. apposition
6. maturation

Question 4

1. initation

Answer 4

cellular induction

Question 5

2. bud stage

Answer 5

cellular proliferation

Question 6

3. cap stage

Answer 6

proliferation, differentiation
and morphogenesis

Question 7

4. bell stage

Answer 7

proliferation, differentation, morphgenesis

Question 8

5. apposition

Answer 8

induction and proliferation

Question 9

6. maturation

Answer 9

maturation

Question 10

epithelium (ectoderm) plays an instructional role during the ________ of tooth formation.

Answer 10

pre-tooth bud stage

Question 11

EPITHELIUM specifies the dental nature of the ___________ and in turn, this specifies the tooth type (incisor vs. molar) and nature of the product produces by epithelium (enamel matrix)

Answer 11

mesenchyme

Question 12

ectoderm invaginates into the mesenchyme and is now called the

Answer 12

dental lamina

Question 13

the lamina is separated from the surrounding mesenchyme by a

Answer 13

basement membrane

Question 14

proliferating oral ectoderm making the transition into

Answer 14

dental lamina

Question 15

what results in creation of buccal vestibule

Answer 15

apoptosis

Question 16

cuboidal cells
protective layer

Answer 16

outer enamel epithelium

Question 17

cuboidal cells
differentiate into ameloblasts

Answer 17

inner enamel epithelium

Question 18

starshaped cells forming network inside enamel organ

Answer 18

stellate recticulum

Question 19

supportive function in enamel production

Answer 19

stellate reticulum
and
stratum intermedium

Question 19

compressed layer of flat cuboidal cells

Answer 19

stratum intermedium

Question 19

differentiate into cementum, PDL and bone

Answer 19

dental sac

Question 19

collagen fibers around enamel organ

Answer 19

dental sac

Question 19

cells nearest IEE have basement membrane separation

Answer 19

dental papillae

Question 20

outer cells differentiate into odontoblasts, whereas inner cells differentiate into pulp tissue

Answer 20

dental papilla

Question 21

parts of enamel organ

Answer 21

outer enamel epi inner enamel epi stellate reticulium stratum intermedium

Question 22

junction of the outer and inner enamel epitheliua

Answer 22

cervical loop

Question 23

site of cemento-enamel junction (CEJ) in adult tooth

Answer 23

cervical loop

Question 24

fusion and apical extension of the outer and inner enamel epithelia

Answer 24

hertwig's epithelial root sheath

Question 25

this determines the outline of the root dentin and the number of roots a tooth will have. it is removed before the cementum is laid down

Answer 25

hertwig's epithelial root sheath

Question 26

what is removed before the cementum is laid down?

Answer 26

hertwig's epi root sheath

Question 27

where does enamel formation stop at

Answer 27

the termination of the enamel organ

Question 28

what continues after enamel formation stops at enamel organ

Answer 28

dentin formation continues and pushes tooth occlusionally

Question 29

the epithelial diaphragm is the modification of hertwig's sheath creating ________ that divide thepupal tissue and create multiple roots

Answer 29

septa

Question 30

root length is not completed until __________ years after the tooth has emerged into the oral cavity. pulp chamber ______ and apical opening _____

Answer 30

1-4 years pulp chamber narrows and apical opening constricts

Question 31

first formed dentin contains both type I and III collagen

Answer 31

mantle dentin

Question 32

with mantle dentin, collagen fiber in the matrix are oriented perpendicular to the

Answer 32

DEJ

Question 33

inner enamel epithlium -> ->

Answer 33

inner enamel epithelium-> ameloblasts->enamel

Question 34

peripheral cells of dental papillae-> ->

Answer 34

peripheral cells of dental papillae-> odontoblasts->dentin

Question 35

migration of ameloblasts: odontoblasts:

Answer 35

ameloblasts: peripherally odontoblasts: inward (centrally)

Question 36

in apposition stage, actively secreting ameloblasts are

Answer 36

tall column cells

Question 37

in apposition stage, inactive (reduced) ameloblasts are

Answer 37

short columnar or elongated cuboidal cells

Question 38

at the final stage of mineralization, the reduced ameloblasts with the remaining cells of the outer enamel epithelium, stellate reticulum, and stratum intermedium form a membrane on the surface of the enamel. this is called

Answer 38

primary cuticle (aka nasmyth's membrane)

Question 39

refers to total lack of tooth development

Answer 39

anodontia

Question 40

denotes the lack of development of one or more teeth

Answer 40

hypodontia

Question 41

lack of formation of 6 or more teeth

Answer 41

oligodontia

Question 42

development of increased number of teeth

Answer 42

hyperdontia

Question 43

defect that originates during INITATION STAGE that results in delveopment of 1 or more extra teeth

Answer 43

supernumerary teeth

Question 44

most common manifestation of supernumerary tooth formation -supernumerary tooth present in midline between two central incisors

Answer 44

mesodens

Question 45

originates during the INITIATION STAGE and results in multiple small fragments of tooth structure consisting of dentin, enamel, cementum or any combination

Answer 45

odontoma

Question 46

comprised of a conglomerate mass of enamel and dentin that bears no anatomic resemblance of a tooth

Answer 46

complex odontoma

Question 47

comprised of multiple, small tooth like structures

Answer 47

compound odontoma

Question 48

enlargement of body and pulp chamber of multirooted teeth with apical displacement of bifurcation ex. exceptionally long root trunk with very short roots

Answer 48

taurodontism

Question 49

defined as an abnormal angulation or bend in the root

Answer 49

dilaceration

Question 50

defect that originates during CAP STAGE of development that results in large single rooted tooth with one pulp cavity and exhibits twinning in crown area

Answer 50

gemination

Question 51

tooth count is normal when the double tooth is counted as one

Answer 51

gemination

Question 52

refers to double tooth in which the tooth count reveals a missing tooth when double tooth is counted as one

Answer 52

fusion

Question 53

defect occurring during APPOSITION and MATURATION stages that result in union of root structure of 2 or more teeth by cementum

Answer 53

concresence

Question 54

defect occurring during CAP STAGE of development that results in an extra cusp due to effects on enamel organ

Answer 54

tubercle formation

Question 55

originates by separation of the dental follicle (dental sac) from the crown of an unerupted tooth. cyst is attached at CEJ -cyst type comprises 20% of all jaw cysts

Answer 55

dentigerous cyst aka follicular cyst

Question 56

this arises from the cell rests of the dental lamina (also called rests of serres) -constitutes 3-11% of all odontogenic cysts

Answer 56

odontogenic keratocyst (OKC) or keratocystic odontogenic tumor

Question 57

60% of OKC cases are in patients between ages of

Answer 57

10 and 40

Question 58

65% of cases for OKC are located in

Answer 58

mandible (most common in posterior mandible)

Question 59

OKCs are bone ______ cysts

Answer 59

bone expanding cysts

Question 60

OKC cyst wall consists of 6-8 cell layer of stratified squamous epithelium with parakeratosis at the: the lumen is often filled with:

Answer 60

luminal surface keratin

Question 61

the presence of inflammation due to OKC will cause epithelial proliferation and pallisading of the

Answer 61

basal layer

Question 62

the most common neoplastic lesion arising from odontogenic epithelium.

Answer 62

amelobastoma

Question 63

slow growing, locally invasive tumor. lesions have a multilocular or "SOAP BUBBLE" appearance on radiographs. these tumors (are/arent) radio-resistant

Answer 63

ameloblastoma ARE radio-resistant