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histopath > odontogenesis > Flashcards

odontogenesis Flashcards

1
Q

tooth:

A

enamel
dentin
cementum
pulp

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2
Q

periodontium

A

gingiva
periodontal ligament
cementum
alveolar bone proper

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3
Q

stages of tooth development:
1
2
3
4
5
6

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

cellular induction

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5
Q
  1. bud stage
A

cellular proliferation

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6
Q
  1. cap stage
A

proliferation, differentiation
and morphogenesis

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7
Q
  1. bell stage
A

proliferation, differentation, morphgenesis

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8
Q
  1. apposition
A

induction and proliferation

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9
Q
  1. maturation
A

maturation

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10
Q

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

A

pre-tooth bud stage

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11
Q

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)

A

mesenchyme

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12
Q

ectoderm invaginates into the mesenchyme and is now called the

A

dental lamina

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13
Q

the lamina is separated from the surrounding mesenchyme by a

A

basement membrane

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14
Q

proliferating oral ectoderm making the transition into

A

dental lamina

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15
Q

what results in creation of buccal vestibule

A

apoptosis

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16
Q

cuboidal cells
protective layer

A

outer enamel epithelium

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17
Q

cuboidal cells
differentiate into ameloblasts

A

inner enamel epithelium

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18
Q

starshaped cells forming network inside enamel organ

A

stellate recticulum

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19
Q

supportive function in enamel production

A

stellate reticulum
and
stratum intermedium

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19
Q

compressed layer of flat cuboidal cells

A

stratum intermedium

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19
Q

differentiate into cementum, PDL and bone

A

dental sac

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19
Q

collagen fibers around enamel organ

A

dental sac

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19
Q

cells nearest IEE have basement membrane separation

A

dental papillae

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20
Q

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

A

dental papilla

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21
Q

parts of enamel organ

A

outer enamel epi
inner enamel epi
stellate reticulium
stratum intermedium

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22
Q

junction of the outer and inner enamel epitheliua

A

cervical loop

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23
Q

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

A

cervical loop

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24
Q

fusion and apical extension of the outer and inner enamel epithelia

A

hertwig’s epithelial root sheath

25
Q

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

A

hertwig’s epithelial root sheath

26
Q

what is removed before the cementum is laid down?

A

hertwig’s epi root sheath

27
Q

where does enamel formation stop at

A

the termination of the enamel organ

28
Q

what continues after enamel formation stops at enamel organ

A

dentin formation continues and pushes tooth occlusionally

29
Q

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

A

septa

30
Q

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

A

1-4 years

pulp chamber narrows and apical opening constricts

31
Q

first formed dentin
contains both type I and III collagen

A

mantle dentin

32
Q

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

A

DEJ

33
Q

inner enamel epithlium ->

->

A

inner enamel epithelium-> ameloblasts->enamel

34
Q

peripheral cells of dental papillae->

->

A

peripheral cells of dental papillae-> odontoblasts->dentin

35
Q

migration of ameloblasts:
odontoblasts:

A

ameloblasts: peripherally
odontoblasts: inward (centrally)

36
Q

in apposition stage, actively secreting ameloblasts are

A

tall column cells

37
Q

in apposition stage, inactive (reduced) ameloblasts are

A

short columnar or elongated cuboidal cells

38
Q

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

A

primary cuticle (aka nasmyth’s membrane)

39
Q

refers to total lack of tooth development

A

anodontia

40
Q

denotes the lack of development of one or more teeth

A

hypodontia

41
Q

lack of formation of 6 or more teeth

A

oligodontia

42
Q

development of increased number of teeth

A

hyperdontia

43
Q

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

A

supernumerary teeth

44
Q

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

A

mesodens

45
Q

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

A

odontoma

46
Q

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

A

complex odontoma

47
Q

comprised of multiple, small tooth like structures

A

compound odontoma

48
Q

enlargement of body and pulp chamber of multirooted teeth with apical displacement of bifurcation

ex. exceptionally long root trunk with very short roots

A

taurodontism

49
Q

defined as an abnormal angulation or bend in the root

A

dilaceration

50
Q

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

A

gemination

51
Q

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

A

gemination

52
Q

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

A

fusion

53
Q

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

A

concresence

54
Q

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

A

tubercle formation

55
Q

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

A

dentigerous cyst aka follicular cyst

56
Q

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

A

odontogenic keratocyst (OKC) or keratocystic odontogenic tumor

57
Q

60% of OKC cases are in patients between ages of

A

10 and 40

58
Q

65% of cases for OKC are located in

A

mandible
(most common in posterior mandible)

59
Q

OKCs are bone ______ cysts

A

bone expanding cysts

60
Q

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

the lumen is often filled with:

A

luminal surface

keratin

61
Q

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

A

basal layer

62
Q

the most common neoplastic lesion arising from odontogenic epithelium.

A

amelobastoma

63
Q

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

A

ameloblastoma

ARE radio-resistant

64
Q
A

histopath (13 decks)

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