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Dental Anatomy > Tooth abnormalities > Flashcards

Tooth abnormalities Flashcards

1
Q

Enamel oringinated from

A

Ectoderm

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2
Q

Dental papilla originated from

A

mesoderm

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3
Q

What is dental papilla

A

dentin and pulp

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4
Q

What is the dental sac

A

cementum
periodontal ligament
alveolar bone

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5
Q

where did the dental sac originate from

A

mesoderm

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6
Q

What is the dental lamina

A

region where the teeth form- defined by an epithelial thickening

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7
Q

What are the 4 different stages of tooth maturation

A

bud stage
cap stage
bell stage
crown or maturation tage

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8
Q

What is the bud stage

A

Dental lamina differentiates and tooth buds appear on the dental lamina in the approximate location of the 20 teeth

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9
Q

What is the cap stage

A

When the round form of the tooth bud is altered and the basal portion invaginate and the structure takes the form of a cap

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10
Q

What is the bell stage

A

deepening of the concavity of the cap formation

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11
Q

When is most of the enamel and dentin formed

A

during the bell stage

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12
Q

What is the crown stage

A

hard tissue develops

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13
Q

What do ameloblasts makes

A

enamel

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14
Q

When do ameloblasts die

A

when teeth erupt

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15
Q

Can we make more enamel once our teeth have erupted?

A

no

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16
Q

What do ondontobasts make?

A

dentin

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17
Q

Can we make dentin after tooth eruption

A

yes

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18
Q

The splitting of a single tooth bud results in…

A

gemination

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19
Q

What tooth most commonly undergoes gemination

A

incisors

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20
Q

What are the two types of gemination

A

incomplete and complete

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21
Q

Define incomplete gemination

A

two crowns with a common root and pulp chamber

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22
Q

Define complete gemination

A

two identical teeth individual teeth next to one another

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23
Q

Union of two adjacted tooth buds results in…

A

Fusion

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24
Q

Fusion is two teeth being… together

A

fused

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25
Q

T/F: Fusion can only involve the crowns, not the roots

A

F can involve only crowns or both crowns and roots

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26
Q

Define Concrescence

A

The union by way of the cementum of the roots of two or more teeth

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27
Q

When does concrescence normally occur

A

after eruption

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28
Q

Concrescence is most commonly found in what teeth

A

molars (especially maxillary where the roots are within close proximity to adjacent teeth)

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29
Q

T/F: Concrescence can not occur between crowns of teeth

A

t (crowns do not have cementum)

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30
Q

What actions result in dens in dente

A

results from infolding of the enamel organ whereby dentin and enamel become reversed inside the pulp chamber

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31
Q

How are most cases of dens in dente treated

A

with root canal treatment

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32
Q

What does dens in dente look like radiographically

A

appears as a small tooth inside another tooth

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33
Q

What tooth is dens in dente most commonly seen

A

permenant maxillary lateral incisors

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34
Q

How do supernumerary teeth (accessory) teeth arise?

A

the result from extra tooth buds on the dental lamina- considered genetic

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35
Q

T/F: Deciduous dentition can not develop supernumerary teeth

A

F (can occur in both sets)

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36
Q

Define a mesiodens

A

a supernumerary tooth found at the midline of the palate between the maxillary central incisors

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37
Q

What is distodens

A

Supernumary tooth found distal to the third molar

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38
Q

Define Anodontia

A

lack of teeth

39
Q

What are the two types of anodontial

A

total and partial

40
Q

Define total anodontia

A

A large number or all of the teeth are missing (Teeth didn’t form)

41
Q

Define partial anodontia

A

One or a few teeth don’t form

42
Q

Is anodontia genetic?

A

yes

43
Q

Can anodontia occur in deciduous dentition

A

yes-but unlikely

44
Q

Most common tooth impacted by anodontia in deciduous teeth

A

mandibular central incisor

45
Q

Most common teeth influenced by anodontia in permanent dentition

A
  • 3rd molar
  • Maxillary lateral incisor
  • Mandibular 2nd premolar
46
Q

Define pseudoanodontia

A

Large number of teeth have not erupted but have all formed (are impacted)

47
Q

Define impacted

A

Teeth that either partially erupt or do not erupt at all.

48
Q

Common reason why teeth become impacted

A

obstruction

49
Q

Tooth that is most commonly impacted is

A

third molars

50
Q

Define transpostion

A

When teeth are out of place (i.e first premolar is mesial to a canine v.s distal to it)

51
Q

Define neonatal teeth

A

Deciduous teeth present at time of birth

52
Q

What is microdontia/macrodontia

A

Teeth are smaller/bigger than normal

53
Q

What are the two types of macro/microdontia

A

true and false

54
Q

define true macro/microdontia

A

All teeth are abnormally large or small

55
Q

Define false micro/macrodontia

A

individual teeth are large/small

56
Q

Microdontia is a result of

A

pituitary dwarfism

57
Q

Macrodontia is a result of

A

pituitary gigantism

58
Q

What is a peg tooth

A

A tooth with incomplete crown formation

59
Q

What tooth is most commonly seen as a peg tooth

A

maxillary lateral incisors

60
Q

Other teeth seen as peg teeth may be…

A

premolars

61
Q

What lobes develop in peg teeth and which ones do not?

A

Do- The lingual and middle

Don’t- Distal and mesial

62
Q

What is a talon cusp

A

Extra enamel projection on a crown

63
Q

Where is a talon cup most often seen

A

most often seen on the cingulum

64
Q

what tooth is commonly seen with talon cusps

A

maxillary lateral incisors

65
Q

T/F A talon cusp can not contain a pulp horn

A

F- they can

66
Q

What is an enamel pearl

A

small spherical nodule of enamel surrounding dentin core

67
Q

Where do enamel pearls attach

A

to the roots of molars- most commonly at the furcation area

68
Q

What issues can an enamel pearl lead to

A

periodontal problems

69
Q

Why must you be careful when grinding away an enamel pearl

A

they may contain pulp horns

70
Q

Taurodontia is characterized by…

A

pulp chamber that’s very long without a constriction at the CEJ

71
Q

T/F: Taurodontia only occurs in permanent teeth

A

t

72
Q

Name two different distortion of tooth formation as a result of traumatic injury or pressure on developing teeth

A

flexion and dilaceration

73
Q

Define flexion

A

Occurs when injury happens later in development and the distortion (bending) is only found in the root

74
Q

Define dilaceration

A

Occurs earlier in development Distortion (bending) in both crown and root

75
Q

How can tetracycline stain happen

A

by taking the antibiotic tetracycline during the time of teeth formation

76
Q

What part of the tooth does the antibiotic tetracycline stain?

A

Dentin

77
Q

Define enamel hypoplasia/enamel hypocalcification

A

Dysplasia of enamel due to a disturbance at the time of enamel formation

78
Q

What is amelogenesis imperfecta

A

dysplasia (lack of) enamel-

79
Q

Is amelogenesis imperfecta genetic?

A

Yes

80
Q

What is the cause of amelogenesis imperfecta

A

faulty ameloblasts

81
Q

Consequences of amelogenesis imperfect

A

teeth are anesthetic, easily worn down, and prone to rampant decay

82
Q

What is dentinogenesis imperfect

A

genetic disturbance of dentin formation resulting in bluish brown anesthetic crowns, little or no pulp chambers form

83
Q

Whey are those with dentinogenesis imperfect prone to fracture

A

because the enamel is under poor dentinal support

84
Q

What is ectodermal dysplasia

A

genetic condition resulting in defective formation of ectodermal structures

85
Q

What is Cleidocraniodysostosis

A

defective formation of membrane bones (bones of skull, clavicle, and mandible)

86
Q

What bones will not be affected by Cleidocraniodysostosis

A

bones with a cartilagenous precursor

87
Q

What is odontoma

A

a benign tooth tumor

88
Q

What tissues includes odontoma

A

ectodermal and mesodermal

89
Q

How does odontoma arise

A

infection or trauma disturbing the dental lamina

90
Q

What are found in the odontoma tumors

A

enamel dentin and cementum

91
Q

What are the two types of odontoma

A

Complex and compound

92
Q

Define complex odontoma

A

One mass of calcified dental tissues without recognizable tooth form attached to a tooth or located separately in alveolar bone

93
Q

Define Compound odontoma

A

calcified dental tissue that is arranged in recognizable tooth forms

Dental Anatomy (10 decks)

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