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I.O.E Tooth Morphology > Tooth development > Flashcards

Tooth development Flashcards

1
Q

Bell stage

A

Fourth stage of odontogenesis. Occurs between 11th-12th week of prenatal development.

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2
Q

Dental papilla

A

produces dentin & pulp for inner part of tooth

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3
Q

HERS

A

Hertwig epithelial root sheath.Induces dentin formation in root area

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4
Q

Enamel dysplasia (Maturation stage disturbance)

A

faulty development of enamel. Can be local or systemic

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5
Q

Bell stage

When does it occur?

signifigacne of bell stage

what else occurs?

A

Morphodifferentiation visable, start of reconisable tooth stage

around 14th week, occurs when a 4th layer of epithelium, stratum intermedium appears, cuboidal shaped

serves as a protective barrier for the rest of the enmeel organ during enamel production

Enamel organ develops an extention to the lngual side of each primary tooth germ

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6
Q

the origin of the ectomensenchymn are…

these cells are primary dervied from

they also give rise to…

A

derived from the nerual crest

ectoderm

mesenchymal tissues

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7
Q

odontogenseis

when it starts?

A

start of tooth develoment

starts 6th week after fertilisation

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8
Q

Dilaceration (Root formation disturbance)

A

distorted root(s) or severe associated crown angulation in formed tooth. Caused by distortion of HERS

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9
Q

Enamel organ

A

produces enamel on outer surface of crown

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10
Q

Avulsed tooth

A

tooth that is completely removed from socket due to trauma

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11
Q

Ameloblasts

A

being amelogenesis, appositional growth of enamel matrix

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12
Q

Microdontia (Bud stage disturbance)

A

Abnormally small teeth

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13
Q

Nonsuccedaneous

A

Pernament Molars

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14
Q

Supernumerary teeth (Initiation stage disturbance)

A

development of one or more extra teeth. most commonly between maxillary central incisors or distomolar

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15
Q

Bell stage of the enmel organ

The inner enamel epithelium lines:

Differenentated to:

Layer IEE and stellte reticulum

The outer enamel epithelium:

Capillaries:

A

the concavty of the bell stage

ameloblast

Stratum intermedium

line the periphery of the enamel organ

are near the outer enamel epitheiulm and bring nutrition for the cells of the enamel organ

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16
Q

the bud stage

When does this happen?

A

the first stage in development of the enamel organ that form the enamel of teeth

8 weeks

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17
Q

Dentin Dysplasia

A

Faulty development of dentin. interference with metabolic processes of odontoblasts

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18
Q

Fusion (Cap stage disturbance)

A

Union of two adjacent tooth germs. Two pulp cavities but one large crown

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19
Q

Oral epithelium (Initiation stage)

A

comes from outer part of ectoderm. consists of two horseshoe-shaped bands of tissue

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20
Q

Rests of Malassez

A

remnants of HERS. has potential to form cysts

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21
Q

Basement membrane (Initiation stage)

A

acellular structure that separates the oral epithelium and ectomesenchyme in the stomodeum

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22
Q

Gemination (Cap stage disturbance)

A

Single tooth germ tries unsuccessfully to divide into two tooth germs. Single rooted w/ one large pulp cavity and “twining” crown

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23
Q

Succedaneous

A

Permanent teeth that replace primary teeth. Anterior teeth & premolars

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24
Q

Enamel pearl (Root formation disturbance)

A

Small spherical enamel projections on tooth surface

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25
Q

ERM

A

Epithelial rests of Malassez. Cells become this after disintegration of root sheath

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26
Q

REE

A

reduced enamel epithelium

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27
Q

Enamel hypoplasia

A

type of enamel dysplasia. results from a reduction in quantity of enamel matrix

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28
Q

Accessory roots

A

extra root on tooth

29
Q

Dental lamina (initiation stage)

A

7th week. produced by oral epithelium growing deeper into ectomesenchyme

30
Q

Cap stage

A

Third stage of odontogenesis. Occurs between 9th-10th week of prenatal development (fetal period). Morphogenesis

31
Q

Initiation stage

A

first stage of tooth development. involves induction (interaction between embryologic tissues)

32
Q

Bud Stage

A

second stage of odontogenesis, occurs at 8th week. Proliferation of dental lamina into buds

33
Q

Masmyth membrane

A

green-gray residue

34
Q

Cervical loop

A

Responsible for root development

35
Q

Amelogenesis Imperfecta

A

certain type of enamel dysplasia

36
Q

Rests of Serres

A

Remnants of dental lamina

37
Q

Enamel hypocalcification (Turner tooth)

A

“sparkle spot” white area, or white tooth

38
Q

Passive eruption

A

occurs with aging when gingival tissue recedes but no actual tooth movement takes place

39
Q

Dentinogenesis

A

appositional growth of dentin matrix. forms dentin

40
Q

How many dental lamina?

A

the cells are sent in bunches, 10 maxillary and 10 mandibular

41
Q

Stellate reticullum

where is it?

physical properties

A

located in the centre of the enamel organ of a devloping tooth. star-shaped. they synthesis glycominoglycans (sugars). water is draw between cells and strech them apart. as they move further away fom each other they stay connected through desmosomes, resulting in their star appearnce

42
Q

Macrodontia (Bud stage disturbance)

A

Abnormally large teeth

43
Q

Tubercles (Cap stage disturbance)

A

small, round enamel extensions forming extra cusps

44
Q

Dental Lamina

A

the thickened oral epthelium that grows downward into the mesoderm.

45
Q

Dentigerous cyst

A

Odontogenic cyst that forms from reduced enamel epithelium

46
Q

Root dentin formation occurs

A

when outer cells of dental papilla in root area undergo induction and then differentiation and become odontoblasts

47
Q

Cap stage

whats the layers

When does this happen?

A

cross section enanmel looks like a cap

consists of 3 layers : OEE, IEE, stellate reticulum

10 weeks

48
Q

OEE

What is its function?

Looks like?

A

outer enamel epithelium

this is the protective layer for the enamel organ. later it plays a rolein attaching the gingiva to the tooth

they are cuboid shape

49
Q

Odontoclasts

A

cause mainly primary tooth root respiration with the removal of dentin and cementum

50
Q

tooth devlopment is interactions between…

A

the oral epithelium

and the ectomesenchyme cells

51
Q

Ectomesenchyme (Initiation stage)

A

type of mesenchyme that is derived from neural crest cells.

52
Q

The primative oral epithelium is dervived from

A

ectoderm

53
Q

Ectodermal Dysplasia (Initiation stage disturbance)

A

abnormal development of skin, hair, nails, teeth, or sweat glands

54
Q

Active eruption

A

vertical movement of tooth

55
Q

Enamel Hypoplasia: Syphilis

A

Mullbury molars and Hutchinson incisors

56
Q

Tomes process

A

responsible for laying down the enamel matrix into place

57
Q

Dental Sac

A

capsule-like dental sac that produces the periodontium, cementum, PDL and alveolar process

58
Q

Basement membrane during cap stage

A

between enamel organ and dental papilla. creates dentinoenamel junction

59
Q

Apposition stage

A

enamel, dentin & cementum are secreted in successive layers

60
Q

Odontogenesis

A

process of tooth development

61
Q

IEE

Physical properties

A

Inner enamel epithelium

tall columnar shaped. these cells outline the concavity in the deepest part of the enamel organ. they are continious with the OEE and come from the basal layer of the oral epithelium

62
Q

Maturation stage

A

Final stage of odontogenesis

63
Q

Anodontia (Initiation stage disturbance)

A

Lack of initiation within lamina dura. Absence of tooth/teeth

64
Q

Dentinogenesis Imperfecta

A

blue/gray or brown teeth

65
Q

matrix

A

Extracellular substance that is partially mineralized. Serves as a framework for later full mineralization to the tissue type’s expected level

66
Q

Cementogenesis

A

Occurs when the HERS disintegrates

67
Q

Dens in Dente (Cap stage disturbance)

A

Enamel organ abnormally invaginate by growth into the dental papilla. Most common in lateral incisors

68
Q
A
69
Q

Tooth germ

A

At end of cap stage, enamel organ, dental papilla and dental sac come together and form this.

I.O.E Tooth Morphology (4 decks)

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