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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
Q

When does the cap stage occur?

A

Between the ninth and 10th week of prenatal development, or during the fetal period.

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26
Q

What is primordium?

A

The tooth germ

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27
Q

During what stage does primordium occur?

A

The cap stage

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28
Q

What are the three components of the tooth germ?

A

Enamel organ
Dental papilla
Dental sac

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29
Q

What does the dental papilla produce?

A

Dentin and pulp

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30
Q

What will the dental sac produce?

A

Cementum
Periodontal ligament
Alveolar process

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31
Q

What does succedaneous mean?

A

Teeth that have permanent teeth growing under them.

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32
Q

Which teeth are considered succedaneous

A

Anterior teeth and premolars.

33
Q

What are non-succedaneous teeth?

A

Teeth that have no primary predecessors.

34
Q

Which teeth are considered non-succedaneous?

A

Permanent molars

35
Q

When does the bell stage occur?

A

Between the 11th and 12th week of prenatal development

36
Q

What are the four different types of cells found within the enamel organ during the bell stage?

A

Outer Enamel epithelium
Stellate reticulum
Stratum intermedium
Inner enamel epithelium

37
Q

The outer cuboidal cells of the enamel organ are called what?

A

Outer enamel epithelium (OEE)

38
Q

What is the purpose of the outer enamel epithelium?

A

It serves as a protective barrier during an enamel production

39
Q

The innermost columnar cells of the enamel organ are called

A

Inner enamel epithelium (IEE)

40
Q

Inner enamel epithelium turn into enamel secreting cells called

A

Ameloblasts

41
Q

What does the opposition stage form?

A

Mineralized dental tissue
Enamel
Dentin
Cementum

42
Q

What is the first signal for tooth development?

A

Dental placodes

43
Q

Dens en Dente occurs during what stage of development?

A

Cap stage

44
Q

What are tubercles?

A

Enamel extensions forming extra cusps

45
Q

What occurs in the bell stage?

A

Odontoblasts make dentin
IEE creates enamel

46
Q

What type of cell is the outer enamel epithelium?

A

Cuboidal

47
Q

What type of cells are inner enamel epithelium?

A

Cuboidal

48
Q

Inner enamel epithelium differentiates into enamel secreting cells called

A

Ameloblasts

49
Q

What stage of odontogenesis does the connection between surface epithelium and the tooth germ disintegrate?

A

Late bell stage

50
Q

What is amelogenesis?

A

The production of enamel

51
Q

Where is the tomes process located?

A

Ameloblast
(Picket fence)

52
Q

What is the function of Tomes Process?

A

Secretion of enamel matrix

53
Q

Where are the dentinal tubules found

A

End of Odontoblasts

54
Q

Enamel can only be made during

A

Initial tooth development

55
Q

What structure is responsible for root formation?

A

Cervical loop

56
Q

Epithelial rests of Malassez become stuck where

A

PDL and Cementum

57
Q

What creates cementum?

A

Cementocytes

58
Q

What does the Sharpeys fibers connect?

A

PDL and alveolar bone

59
Q

The crown seen above the gumline id called the

A

Clinical crown

60
Q

The whole crown is called the

A

Anatomical crown

61
Q

Enamel has masticatory impact of ____ pounds of pressure per tooth

A

20-30

62
Q

What makes up the color of enamel?

A

Dentin

63
Q

Erosion can be caused from

A

Bulimia
GERD

64
Q

What pH causes acid to form resulting in destruction of tooth surface enamel?

A

5.5 or lower

65
Q

Enamel rods that curve from the right and left are called

A

Hunter-Schreger bands

66
Q

Where is gnarled enamel found?

A

Cusps of teeth

67
Q

Where is the interrod enamel found

A

In between enamel rods

68
Q

What are Incremental lines of Retzius

A

Bands that cross enamel rods.
Layers enamel as it is forming

69
Q

What are enamel spindles

A

Odontoblasts that cross over into enamel and get trapped by enamel formation

70
Q

What are the two stages of dentin maturation?

A

Primary
Secondary

71
Q

What is the lifeline of the tooth?

A

Dentinal tubules

72
Q

Predentin consists of _____

A

Nonmineralized collagen fibers

73
Q

Where is mantle Dentin found?

A

Upper section of dentinal layer

74
Q

When is primary dentin formed?

A

Before the apex of the tooth is formed

75
Q

When is secondary dentin formed?

A

Constantly throughout the tooth life

76
Q

When is tertiary dentin found?

A

After tooth trauma

77
Q

Where are vonKorffs fibers found?

A

Perpendicular to mantle dentin (opposite)

78
Q

What type of dentin makes up the bulk of dentin?

A

Circumpulpal dentin

79
Q

When does circumpulpal dentin form?

A

Forms and matures after mantle dentin

Dental Hygiene (3 decks)

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