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Tooth Morphology > Final exam > Flashcards

Final exam Flashcards

1
Q

Wider and longer crowns with straight incisal edges

A

Maxillary centrals

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2
Q

Smaller and more rounded edges with straight incisal edges

A

Maxillary laterals

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3
Q

Rounded facial surfaces with a single pointed cusp

A

Maxillary canines

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4
Q

-Most commonly extracted
-May have divided root
-Long central groove that extends over mesial marginal ridges
-Possible bifurcation
-Mesial crown concavity
-Mesial root depression

A

Maxillary 1st premolars

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5
Q

-Short central groove only 1/3 of occlusal surface
-1 root
-No bifurcation

A

Maxillary 2nd premolars

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6
Q

-3 roots
-Oblique ridge
-Cusp of carabelli
-4 cusps

A

Maxillary 1st molars

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7
Q

-3 roots
-Oblique ridge
-Can be tricusped

A

Maxillary 2nd molars

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8
Q

-Most narrow
-Symmetrical

A

Mandibular centrals

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9
Q

-Edges more rounded
-Incisal edge slopes distally
-Wider than centrals

A

Mandibular laterals

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10
Q

-One single cusp tip
-Rare bifurcated root

A

Mandibular canines

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11
Q

-Most commonly extracted
-Short lingual non-functional cusp

A

Mandibular 1st premolars

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12
Q

-Functional lingual cusp
-Often has two lingual cusps
-Can be tricusped

A

Mandibular 2nd premolars

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13
Q

-5 cusps
-2 roots
-Zig-zag central groove
-2 buccal pits & grooves
-Mesial root may have two canals

A

Mandibular 1st molars

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14
Q

-4 cusps
-2 roots
-Cross central groove
-1 buccal pit

A

Mandibular 2nd molars

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15
Q

What makes up the occlusal table?

A

Margin ridge + cusp ridges/slopes

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16
Q

When does primary tooth development begin?

A

6 weeks in utero

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17
Q

What are the stages of tooth development?

A

Initiation
Bud
Cap
Bell
Apposition
Maturation

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18
Q

When is the initiation stage?

A

6-7 weeks

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19
Q

When is the bud stage?

A

8th week

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20
Q

When is the cap stage?

A

9-10 weeks

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21
Q

When is the bell stage?

A

11-12 weeks

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22
Q

What is the primitive mouth?

A

Stomodeum

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23
Q

What is the stomodeum lined by?

A

Ectoderm

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24
Q

What does the stomodeum give rise to?

A

Oral epithelium

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25
Q

What migrates to areas to influence ectomesenchyme tissue?

A

Neural crest cells

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26
Q

What is oral epithelium and ectomesenchyme separated by?

A

Basement membrane

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27
Q

Extensive growth of the dental lamina into tooth germ penetrating into ectomesenchyme

A

Bud stage

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28
Q

Oral epithelium consists of two horseshoe- shaped bands of tissue which will become the two arches/jaw

A

Initiation stage

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29
Q

Abnormally large teeth

A

Macrodontia

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30
Q

Abnormally small teeth

A

Microdontia

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31
Q
  • Proliferation of growth of cells continues
  • Tooth bud of the dental lamina does not grow
    into a large sphere surrounded by
    ectomesenchyme instead there is unequal
    growth in different parts of the tooth bud
A

Cap stage

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32
Q

What three structures are now considered to be tooth germ at the end of the cap stage?

A

Enamel organ
Dental papilla
Dental sac

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33
Q

What future dental tissue is produced from the enamel organ?

A

Enamel

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34
Q

What future dental tissue is produced by dental papills?

A

Dentin and pulp

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35
Q

What future dental tissue is produced by the dental sac?

A

PDL
Alveolar bone
Cementum

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36
Q

Enamel organ forms into dental papilla
- Tooth within a tooth

A

Dens in dente

37
Q

Tooth germ tries to divide, tooth count is normal

A

Germination

37
Q

Union of two adjacent tooth germs, one less tooth count

A

Fusion

38
Q
  • Continuation of proliferation, differentiation
    and morphogenesis
  • Differentiation on all levels occur resulting in
    four types of cells within the enamel organ
    and two types in the dental papilla
A

Bell stage

39
Q

What are the four developing tissues of the enamel organ?

A

Outer enamel epithelium
Stellate reticulum
Stratum intermedium
Inner enamel epithelium

40
Q
  • More outer star-shaped cells in many layers
    forming a network
  • Supports production of enamel matrix
A

Stellate reticulum

41
Q
  • Compressed layer of flat to cubodial cells
  • Supports production of enamel matrix
A

Stratum intermedium

42
Q
  • Innermost layer
  • Tall columnar cells
  • Will differentiate into enamel secreting cells
A

Inner enamel epithelium

43
Q

Enamel secreting cells

A

Ameloblasts

44
Q

What gives rise to enamel, dentin, cementum, and pulp?

A

Tooth germ

45
Q

What makes up the bulk of a tooth?

A

Dentin

46
Q

What tooth relationship can be changed?

A

Clinical crown & root

47
Q

What makes up a transverse ridge?

A

2 triangular ridges

48
Q

What is the tooth eruption pattern?

A

Centrals
Laterals
Premolars
Canines
Molars

49
Q

What teeth do we look at for occlusion?

A

Maxillary first molars
Canines

50
Q

What do primary maxillary 2nd molars resemble?

A

Permanent maxillary 1st molars

51
Q

What primary teeth don’t resemble any permanent teeth?

A

Primary mandibular 1st molars

52
Q

What do primary mandibular 2nd molars resemble?

A

Permanent mandibular 1st molars

53
Q

Imperfect enamel formation

A

Amelogenesis imperfecta

54
Q

Imperfect formation of dentin

A

Dentinogenesis imperfecta

55
Q

Absence of teeth

A

Anodontia

56
Q

What are the most commonly missing teeth in order?

A

Maxillary 3rd molars
Maxillary laterals
Mand. 2nd premolars
Canines

57
Q

Extra teeth

A

Supernumerary teeth

58
Q

Small supernumerary tooth forms between central incisors

A

Mesiodens

59
Q

Incisors screwdriver shaped, broader cervically, notched incisal edge

A

Hutchinson’s incisors

60
Q

-Bull or prism teeth
-Long pulp chambers
-American indians and artic populations

A

Taurodontia

61
Q

Severe bend or angular distortion of a tooth root

A

Dilaceration - flexion

62
Q

Disturbance in ameloblasts during early enamel formation

A

Enamel dysplasia

63
Q

Incomplete development of enamel localized discolored spot

A

Focal hypoplasia

64
Q

Space between teeth
-Typically centrals

A

Diastema

65
Q

Small round nodules of enamel with a tiny core of dentin

A

Enamel pearls

66
Q

An extra cusp or protuberance on surface

A

Dens evaginatus

67
Q
  • loss of the PDL space so the
    tooth root is fused to the. alveolar bone
  • fail to continue to erupt so
    they appear shorter
A

Ankylosis

68
Q

Loss of tooth structure by chemical means

A

Erosion

69
Q

Wearing away of enamel due to movement

A

Attrition

70
Q

Cervical loss of tooth structure thought to occur from tooth bending under heavy occlusal forces

A

Abfraction

71
Q

Wearing away of tooth structure by mechanical force

A

Abrasion

72
Q

Dental condition that causes the outside of teeth to be lost

A

External resorption

73
Q

Condition that occurs when the body’s own cells break down the dentin and pulpal walls of a tooth

A

Internal resportion

74
Q

Mesial buccal cusp on the maxillary first
molar is aligned with the mesiobuccal groove
of the mandibular first molar

A

class I occlusion

75
Q

Mesiobuccal groove of mandibular molar is
distal to the mesialbuccal cusp of max molar by at least the width of a premolar

A

Class II occlusion

76
Q

mandible is retruded and
ALL maxillary incisors are protruded

A

Class II division I occlusion

77
Q

mandible is retruded and
ONE OR MORE maxillary incisors are retruded

A

Class II division II occlusion

78
Q

Mesiobuccal groove of mandibular molar is
mesial to the mesialbuccal cusp of max molar by at least the width of a premolar

A

Class III occlusion

79
Q

Anterior tooth out of alignment to the labial

A

Labioversion

80
Q

Posterior tooth out of alignment to the labial

A

Buccoversion

81
Q

Tooth out of alignment to lingual

A

Linguoversion

82
Q

Twisted tooth

A

Torsiversion

83
Q

maxillary and mandibular cusp tips line up directly over each other

A

End-to-end

84
Q

Incisal edges of maxillary and
mandibular incisors meet

A

Edge-to-edge bite

85
Q

Posterior teeth occlude but
space between anterior
incisal edges

A

Open bite

86
Q

Overerupted tooth that is abnormally long relative
to the remaining occlusal surfaces

A

Supraeruption - extrusion

87
Q

Tooth is abnormally short relative to the occlusal plane

A

Infraocclusion - infraversion

Tooth Morphology (6 decks)

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