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Yr 2 - oral biology tooth > oral_biology_tooth_morphology_20150331151423 > Flashcards

oral_biology_tooth_morphology_20150331151423 Flashcards

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1
Q

Eruption date of Maxillary deciduous a

A

7 1/2 months

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2
Q

Eruption date of Maxillary deciduous b

A

8 months

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3
Q

Eruption date of Maxillary deciduous c

A

16-20 months

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4
Q

Eruption date of Maxillary deciduous d

A

12-16 months

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5
Q

Eruption date of Maxillary deciduous e

A

21-30 months

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6
Q

Eruption date of Mandibular deciduous a

A

6 1/2 months

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7
Q

Eruption date of Mandibular deciduous b

A

7 months

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8
Q

Eruption date of Mandibular deciduous c

A

16-20 months

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9
Q

Eruption date of Mandibular deciduous d

A

12-16 months

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10
Q

Eruption date of Mandibular deciduous e

A

21-30 months

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11
Q

Eruption date of Maxillary permanent central incisors

A

7-8 years

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12
Q

Eruption date of Maxillary permanent lateral incisors

A

8-9 years

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13
Q

Eruption date of Maxillary permanent canines

A

11-12 years

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14
Q

Eruption date of Maxillary first permanent premolar

A

10-11 years

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15
Q

Eruption date of Maxillary second permanent premolar

A

10-12 years

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16
Q

Eruption date of Maxillary first permanent molar

A

6-7 years

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17
Q

Eruption date of Maxillary second permanent molar

A

12-13 years

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18
Q

Eruption date of Maxillary third permanent molar (wisdom tooth)

A

17-21 years

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19
Q

Eruption date of Mandibular permanent central incisor

A

6-7 years

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20
Q

Eruption date of Mandibular permanent lateral incisor

A

7-8 years

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21
Q

Eruption date of Mandibular permanent canine

A

9-10 years

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22
Q

Eruption date of Mandibular permanent first premolar

A

10-12 years

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23
Q

Eruption date of Mandibular permanent second premolar

A

11-12 years

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24
Q

Eruption date of Mandibular permanent first molar

A

6-7 years

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25
Q

Eruption date of Mandibular permanent second molar

A

12-13 years

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26
Q

Eruption date of Mandibular permanent third molar (wisdom tooth)

A

17-21 years

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27
Q

Define eruption:

A

The axial or occlusal movement of the tooth from its developmental position in the jaw to its functional position in the occlusal plane (a group of complex physiological tooth movements- both pre and post eruptive)

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28
Q

Where are permanent tooth germs located in comparison to deciduous tooth germs?

A

Lingal

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29
Q

Where do permanent tooth crowns normally lie before eruption?

A

At the apical 1/3 of the tooth root

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30
Q

When does tooth development start in utero?

A

6-7 weeks

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31
Q

When are 20 epithelial swellings first visible?

A

Week 8

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32
Q

What is intraosseous eruption?

A

movement of the tooth through bone

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33
Q

What is the speed of intraosseous eruption?

A

1-10 µm per day

34
Q

When the tooth crown comes into contact with the oral epithelium which two types of epithelia fuse?

A

Reduced enamel epitheliumOral epithelium

35
Q

At what stage does root development start?

A

When tooth eruption begins

36
Q

What is the name of the canal necessary for eruption and what is its role?What is located within it?

A

Gubernacular canalPathway through the bone for the toothGubernacular cord = composed of epithelial cells and connective tissue

37
Q

What happens to this canal prior to eruption?

A

It widens

38
Q

What is the rate of eruption once the tooth has emerged into the oral cavity?

A

75 µm per day

39
Q

What are odontoblasts?

A

Giant multi nucleated cells (4-20 nuclei)Ruffled border = increased surface area

40
Q

Name a physiological post-eruptive movement:What is it?And what does it do?

A

Mesial driftDrifting of teeth towards the midlineMaintains inter-proximal contact between neighbouring teeth

41
Q

Name a pathological post-eruptive movement: What is it?

A

Over-eruptionThe over-eruption of an opposing tooth following extraction

42
Q

Why is it unlikely that the periodontal ligament fibrous tissue plays a role in tooth eruption?

A

It is not actually attached to the tooth until after eruption

43
Q

What 4 things can we study to help us understand tooth eruption?

A
  • genetically modified mice (knockout/in genes)- injections of putative eruption molecules into animal models following knockout- cultured dental follicle cells- genetic disorders in humans with failure/delayed eruption
44
Q

What are the 3 main dental implications of cleidocraniaplasia and dysostosis?

A
  1. delayed eruption2. supernumerous teeth3. osteoblasts affect osteoclasts
45
Q

When we cannot determine why a tooth has been erupted what do we call it and what is it?

A

Primary failure of eruptionProblem with the dental follicle -> can be caused by inflammation of mucosa around deciduous teethN.B. = difficult to treat (often we just remove it!)

46
Q

What is diphydonty?

A

Having 2 generations of teeth (deciduous & permanent)

47
Q

What is heterodonty?

A

Having different tooth types/ forms(Incisiforme, caniniforme & molariforme)

48
Q

What is the dental formulae for Deciduous teeth?

A
49
Q

What is the dental formulae for permanent teeth?

A
50
Q

What is the anatomical crown?

A

The part of the crown covered in enamel (fixed)

51
Q

What is the clinical crown?

A

The part of the tooth you can see in the mouth (may also include exposed root in periodontitis)may be > or < than anatomical crown

52
Q

What is the root?

A

The part of the tooth not covered in enamel but covered in cementum instead

53
Q

What is the shape of the root for the maxillary incsisors?

A

Conical - can be rolled in fingers

54
Q

What is the shape of the root in mandibular incisors?

A

Flatter- less able to roll!

55
Q

How many roots do the permanent maxillary molars have?

A

3 roots

56
Q

How many roots do the deciduous maxillary molars have?

A

3 roots

57
Q

How many roots do the permanent mandibular molars have?

A

2 roots

58
Q

How many roots do the -permanent mandibular molars have?

A

2 roots

59
Q

What is the name of the ridge found on the permanent upper molars?And which cusps does it join?

A

Oblique ridgeMesiopalatal (largest) and distobuccal cusp

60
Q

Which is the largest cusp in the molars?

A

Mesiopalatal

61
Q

Which is the smallest cusp in the permanent first and second maxillary molars?

A

The distopalatal

62
Q

Which cusp is sometimes missing from the permanent second maxillary molar?

A

The distopalatal cusp

63
Q

Which tooth has the foramen cecum if it is present?

A

The Permanent maxillary lateral incisor

64
Q

Which root sometimes contains more than one root canal in the permanent first maxillary molar?

A

Mesiobuccal

65
Q

What is the name of the triangular shaped cusp located on the permanent first mandibular first molar?

A

Distal cusp

66
Q

Which mandibular molar has only 4 cusps?

A

7

67
Q

Which mandibular molar has 5 cusps?

A

6

68
Q

Which tooth are the deciduous d’s similar to?

A

The permanent 6’s

69
Q

On the permanent mandibular incisors which side of the root has the deepest grooves?

A

Distal

70
Q

What is the key feature that can be used to determine that a tooth is deciduous?

A

It bulges more at the cervical margin

71
Q

What is the most notable difference in the crowns of mandibular and maxilalry canines?

A

Mandibular canine = convex linguallyMaxillary not really convex - pretty much a straight surface

72
Q

On which surface of deciduos mandibular molars is the tubercle of zukerkandal found?

A

Mesiobuccal

73
Q

What is the occlusal shape of maxillary premolars?

A

Oval

74
Q

What is the occlusal shape of mandibular premolars?

A

Round/square

75
Q

How do you side the first maxillary premolar?

A

The Mesio-distal occlusal fissure crosses over the medial marginal ridge

76
Q

Which cusp is larger in the first maxillary premolar?

A

The buccal cusp

77
Q

In the mandibular permanent first premolar what is the name of the ridge that connects the two cusps called?

A

Transverse buccal-lingual ridge

78
Q

In both mandibular permanent premolar which fossa is biggest?

A

Distal fossa

79
Q

In which % of permanent maxillary first molars can carrabelli cusps be found?

A

50-75%

80
Q

Which is the only permanent tooth to have a neonatal line?

A

The permanent first molars (6)

81
Q

Which cusp is largest in the permanent mandibular first molar?

A

The mesiobuccal

Yr 2 - oral biology tooth (2 decks)

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