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Dental Hygiene > Module 3-4 > Flashcards

Module 3-4 Flashcards

1
Q

What is odontogenesis?

A

The process of tooth development 

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2
Q

What are the two dentitions called? 

A

Primary dentition and permanent dentition

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3
Q

How many teeth does the primary dentition contain? 

A

20 

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4
Q

How many teeth does the permanent dentition contain? 

A

32

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5
Q

 Odontogenesis of the primary dentition begins in what week of prenatal development?

A

Six and seven of embryonic period.

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6
Q

After initiation of odontogenesis what are the three stages in tooth development? 

A

Bud stage
Cap stage
Bell stage

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7
Q

After the bell stage, what stage occurs?

A

Apposition stage

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8
Q

What physiologic processes occur during odontogenesis?

A

 induction, proliferation, differentiation, morphogenesis, and maturation

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9
Q

What is induction?

A

The action of one group of cells on another.
This lead to establishment of a developmental pathway in tissues.

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10
Q

What is proliferation? 

A

Controlled cellular growth, and accumulation of byproducts.

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11
Q

What is differentiation? 

A

The change in identical embryonic cells to become distinct cells.

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12
Q

What is morphogenesis? 

A

Development of specific tissue structure 

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13
Q

What is the first stage of tooth development?

A

The initiation stage 

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14
Q

During the initiation stage, the outer part of the ectoderm gives rise to ____

A

 oral epithelium

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15
Q

Ectomesenchyme is derived from what cells

A

Neural crest cells (NCCs)

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16
Q

What separates oral epithelium and the ectomesenchyme?

A

The basement membrane

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17
Q

What forms of dental lamina?

A

Oral epithelium grows into the ectomesenchyme and is induced.

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18
Q

What does a dental placode consist of?

A

Thickened epithelium with an underlying neural crest derived from mesenchyme or neuroectoderm.

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19
Q

Lack of initiation within the dental lamina results in what developmental disturbance?

A

Anodontia

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20
Q

What is anodontia?

A

The absence of teeth

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21
Q

Supernumerary teeth are also called ______

A

Hyperdontia

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22
Q

When does the bud stage occur?

A

The beginning of the eighth week of prenatal development

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23
Q

Ectomesenchyme surrounds the ______ in the bud stage.

A

Dental lamina

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24
Q

What is macrodontia?
What is microdontia?

A

Macrodontia = abnormally, large teeth
Microdontia = abnormally small teeth

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25
When does the cap stage occur?
Between the ninth and 10th week of prenatal development, or during the fetal period.
26
What is primordium?
The tooth germ
27
During what stage does primordium occur?
The cap stage
28
What are the three components of the tooth germ?
Enamel organ Dental papilla Dental sac
29
What does the dental papilla produce?
Dentin and pulp
30
What will the dental sac produce?
Cementum Periodontal ligament Alveolar process
31
What does succedaneous mean?
Teeth that have permanent teeth growing under them.
32
Which teeth are considered succedaneous
Anterior teeth and premolars.
33
What are non-succedaneous teeth?
Teeth that have no primary predecessors.
34
Which teeth are considered non-succedaneous?
Permanent molars
35
When does the bell stage occur?
Between the 11th and 12th week of prenatal development
36
What are the four different types of cells found within the enamel organ during the bell stage?
Outer Enamel epithelium Stellate reticulum Stratum intermedium Inner enamel epithelium
37
The outer cuboidal cells of the enamel organ are called what?
Outer enamel epithelium (OEE)
38
What is the purpose of the outer enamel epithelium?
It serves as a protective barrier during an enamel production
39
The innermost columnar cells of the enamel organ are called
Inner enamel epithelium (IEE)
40
Inner enamel epithelium turn into enamel secreting cells called
Ameloblasts
41
What does the opposition stage form?
Mineralized dental tissue Enamel Dentin Cementum
42
What is the first signal for tooth development?
Dental placodes
43
Dens en Dente occurs during what stage of development?
Cap stage
44
What are tubercles?
Enamel extensions forming extra cusps
45
What occurs in the bell stage?
Odontoblasts make dentin IEE creates enamel
46
What type of cell is the outer enamel epithelium?
Cuboidal
47
What type of cells are inner enamel epithelium?
Cuboidal
48
Inner enamel epithelium differentiates into enamel secreting cells called
Ameloblasts
49
What stage of odontogenesis does the connection between surface epithelium and the tooth germ disintegrate?
Late bell stage
50
What is amelogenesis?
The production of enamel
51
Where is the tomes process located?
Ameloblast (Picket fence)
52
What is the function of Tomes Process?
Secretion of enamel matrix
53
Where are the dentinal tubules found
End of Odontoblasts
54
Enamel can only be made during
Initial tooth development
55
What structure is responsible for root formation?
Cervical loop
56
Epithelial rests of Malassez become stuck where
PDL and Cementum
57
What creates cementum?
Cementocytes
58
What does the Sharpeys fibers connect?
PDL and alveolar bone
59
The crown seen above the gumline id called the
Clinical crown
60
The whole crown is called the
Anatomical crown
61
Enamel has masticatory impact of ____ pounds of pressure per tooth
20-30
62
What makes up the color of enamel?
Dentin
63
Erosion can be caused from
Bulimia GERD
64
What pH causes acid to form resulting in destruction of tooth surface enamel?
5.5 or lower
65
Enamel rods that curve from the right and left are called
Hunter-Schreger bands
66
Where is gnarled enamel found?
Cusps of teeth
67
Where is the interrod enamel found
In between enamel rods
68
What are Incremental lines of Retzius
Bands that cross enamel rods. Layers enamel as it is forming
69
What are enamel spindles
Odontoblasts that cross over into enamel and get trapped by enamel formation
70
What are the two stages of dentin maturation?
Primary Secondary
71
What is the lifeline of the tooth?
Dentinal tubules
72
Predentin consists of _____
Nonmineralized collagen fibers
73
Where is mantle Dentin found?
Upper section of dentinal layer
74
When is primary dentin formed?
Before the apex of the tooth is formed
75
When is secondary dentin formed?
Constantly throughout the tooth life
76
When is tertiary dentin found?
After tooth trauma
77
Where are vonKorffs fibers found?
Perpendicular to mantle dentin (opposite)
78
What type of dentin makes up the bulk of dentin?
Circumpulpal dentin
79
When does circumpulpal dentin form?
Forms and matures after mantle dentin

Dental Hygiene (3 decks)

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