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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
ERM
Epithelial rests of Malassez. Cells become this after disintegration of root sheath
26
REE
reduced enamel epithelium
27
Enamel hypoplasia
type of enamel dysplasia. results from a reduction in quantity of enamel matrix
28
Accessory roots
extra root on tooth
29
Dental lamina (initiation stage)
7th week. produced by oral epithelium growing deeper into ectomesenchyme
30
Cap stage
Third stage of odontogenesis. Occurs between 9th-10th week of prenatal development (fetal period). Morphogenesis
31
Initiation stage
first stage of tooth development. involves induction (interaction between embryologic tissues)
32
Bud Stage
second stage of odontogenesis, occurs at 8th week. Proliferation of dental lamina into buds
33
Masmyth membrane
green-gray residue
34
Cervical loop
Responsible for root development
35
Amelogenesis Imperfecta
certain type of enamel dysplasia
36
Rests of Serres
Remnants of dental lamina
37
Enamel hypocalcification (Turner tooth)
"sparkle spot" white area, or white tooth
38
Passive eruption
occurs with aging when gingival tissue recedes but no actual tooth movement takes place
39
Dentinogenesis
appositional growth of dentin matrix. forms dentin
40
How many dental lamina?
the cells are sent in bunches, 10 maxillary and 10 mandibular
41
Stellate reticullum where is it? physical properties
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
Macrodontia (Bud stage disturbance)
Abnormally large teeth
43
Tubercles (Cap stage disturbance)
small, round enamel extensions forming extra cusps
44
Dental Lamina
the thickened oral epthelium that grows downward into the mesoderm.
45
Dentigerous cyst
Odontogenic cyst that forms from reduced enamel epithelium
46
Root dentin formation occurs
when outer cells of dental papilla in root area undergo induction and then differentiation and become odontoblasts
47
Cap stage whats the layers When does this happen?
cross section enanmel looks like a cap consists of 3 layers : OEE, IEE, stellate reticulum 10 weeks
48
OEE What is its function? Looks like?
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
Odontoclasts
cause mainly primary tooth root respiration with the removal of dentin and cementum
50
tooth devlopment is interactions between...
the oral epithelium and the ectomesenchyme cells
51
Ectomesenchyme (Initiation stage)
type of mesenchyme that is derived from neural crest cells.
52
The primative oral epithelium is dervived from
ectoderm
53
Ectodermal Dysplasia (Initiation stage disturbance)
abnormal development of skin, hair, nails, teeth, or sweat glands
54
Active eruption
vertical movement of tooth
55
Enamel Hypoplasia: Syphilis
Mullbury molars and Hutchinson incisors
56
Tomes process
responsible for laying down the enamel matrix into place
57
Dental Sac
capsule-like dental sac that produces the periodontium, cementum, PDL and alveolar process
58
Basement membrane during cap stage
between enamel organ and dental papilla. creates dentinoenamel junction
59
Apposition stage
enamel, dentin & cementum are secreted in successive layers
60
Odontogenesis
process of tooth development
61
IEE Physical properties
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
Maturation stage
Final stage of odontogenesis
63
Anodontia (Initiation stage disturbance)
Lack of initiation within lamina dura. Absence of tooth/teeth
64
Dentinogenesis Imperfecta
blue/gray or brown teeth
65
matrix
Extracellular substance that is partially mineralized. Serves as a framework for later full mineralization to the tissue type's expected level
66
Cementogenesis
Occurs when the HERS disintegrates
67
Dens in Dente (Cap stage disturbance)
Enamel organ abnormally invaginate by growth into the dental papilla. Most common in lateral incisors
68
69
Tooth germ
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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