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23 Growth and Development > 5 - Eruption and Occlusion in Permanent Dentition > Flashcards

5 - Eruption and Occlusion in Permanent Dentition Flashcards

1
Q

stages of eruption for permanent teeth

A
  1. follicular growth
  2. pre-emergent eruptive spurt
  3. post-emergent eruptive spurt
  4. juvenile occlusal equilibrium (eruption)
  5. circumpubertal eruptive spurt
  6. adult occlusal equilibrium
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2
Q

what is part of pre-emergent eruption

A
  1. follicular growth
  2. pre-emergent eruptive spurt
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3
Q

what is part of post-emergent eruption

A
  1. post-emergent eruptive spurt
  2. juvenile occlusal equilibrium (eruption)
  3. circumpubertal eruptive spurt
  4. adult occlusal equilibrium
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4
Q

what are 2 necessary processes for pre-emergent eruption

A
  1. resorption of bone and primary tooth roots overlying crown of erupting tooth
  2. eruption mechanism must move tooth in the direction where path has been cleared
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5
Q

are the rate of bone resorption and the rate of tooth eruption controlled by the same physiological mech

A

no

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6
Q

is resorption the rate-limiting factor in pre-emergent eruption

A

yes

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7
Q

Physiologic mechanism of eruption prior to emergence into the mouth and mechanism after a tooth emerges may be different

A

post-emergent eruption

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8
Q

Theories of these physiologic mechanisms associated with permanent tooth eruption:

A
  1. Root growth
  2. Vascular pressure
  3. Bone growth
  4. Periodontal ligament traction (supported by animal studies)
  5. Connective tissue proliferation at the pulp apex (supported by animal studies)
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9
Q

what are variable influencing permanent tooth eruption

A

genetic, environmental, systemic, and local

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10
Q

what factor:

familial, race, sex

A

genetic

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11
Q

what factor:

low birth rate, prematurity, and nutrition

A

environmental

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12
Q

what factor:

Endocrine systems is contributory
High correlation with hypopituitarism and hypothyroidism & delayed eruption
Low correlation with altered growth

A

systemic

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13
Q

what factor:

Premature loss of primary tooth - may delay or accelerate eruption
Supernumerary teeth - will delay if in path of eruption
Trauma - may delay or accelerate eruption
Spacing - crowding may delay or alter eruption path

A

local

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14
Q

during time of crown formation, there is a very slow ___ drift in tooth follicle within the bone

A

labial/buccal drift

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15
Q

beginning of calcification to completion of enamel formation is approx how many years? exceptions?

A

approx 4-5 years
exception: 1M = 3 years, canines = 6 years

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16
Q

each perm tooth starts to move toward occlusion when

A

at time of crown completion and start of root formation

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17
Q

leading edge of perm crown breaks thru alveolar crest at what part of root development

A

2/3rd root development

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18
Q

eruption of perm tooth into oral cavity to root completion takes how long

A

about 3 years

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19
Q

the interval between perm crown completion and eruption into occlusion is how many years

A

approx 5 years

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20
Q

loss prior to crown completion of successor ___ eruption

A

delays

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21
Q

loss after crown completion of successor ___ eruption

A

accelerates

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22
Q

loss of primary molar before age ___ delays eruption of perm PM

A

5

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23
Q

loss of primary molar after age ___ accelerates eruption of permanent premolar

A

8

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24
Q

what is the abnormal direction of tooth eruption and can occur with any tooth and will cause interference with normal tooth eruption

A

ectopic eruption

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25
Q

what is a condition in which a tooth fails to erupt into the oral cavity (multiple causes) and may denote loss of eruptive potential

A

tooth impaction

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26
Q

what is the fusion of cementum with bone occuring at any time during course of eruption and with any tooth and will cause interference with normal tooth eruption

A

ankylosis

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27
Q
A

ectopic eruption

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28
Q
A

ankylosis

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29
Q

describe

A

18 ectopic, might be impacted

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30
Q

describe

A

premolar not impacted yet, but possible future impaction

31
Q

most common variation eruption of perm dentition is what

A

eruption of seocnd molars in either arch before anterior teeth

32
Q

incisor transition is typically completed by ___ to establish “classic/sterotypical” mixed dentition stage of permanent molars and incisors along with primary teeth (C-D-E) in buccal segment

A

8-9 years

33
Q

permanent teeth have tendency to drift __ and tip ___ if space available

A

mesial; mesial

34
Q

mesial movement of permanent teeth is greatest when

A

during root formation and active eruption into the oral cavity before reaching occlusal contact

35
Q

what are the first perm teeth to erupt into the oral cavity

A

1st molars

36
Q

average age of eruption of first molars

A

6 years 3 months

37
Q

at what age should practitioners screen for pathology associated with eruption

A

age 5

38
Q

why is anticipatory guidance necessary for parents and patients before 1st perm molar erupt

A
  1. Permanent tooth shows up without baby tooth falling out
  2. Discuss possible eruption discomfort and palliative care
  3. It’s way back there and they need to keep it clean
39
Q

what are the first succedaneous teeth to erupt

A

mandibular central incisors

40
Q

are permanent molar succedaneous? why?

A

no - they do not replace primary teeth

41
Q

when do max CI and mand lateral erupt

A

7-8 years

42
Q

what are the last group of permanent insicors to erupt

A

maxillary lateral

43
Q

what is the discrepancy in the sum of mesial distal crown width between primary and permanent incisors

A

incisor liability

44
Q

what is the time occurring starting with eruption of permanent incisors and ending with eruption of max permanent canines

A

ugly duckling stage

45
Q

age of ugly ducking stage

A

6-12 years

46
Q

are primary teeth or permanent teeth generally whiter

A

primary teeth are whiter than permanent

47
Q

what erupt after permanent incisors

A

mandibular canines

48
Q

what are the last succedaneous tooth to erupts

A

max perm canines

49
Q

at what age should practiioners start to screen pathology associated with eruption via clinical and radiographic exam

A

9

50
Q

what is this example of

A

asymmetric eruption of canines

51
Q

monitoring eruption of ___ is important when considering manipulation of Leeway Space by dental practitioner to guide eruption

A

perm premolars

52
Q

when do second molars typically erupt

A

12 years

53
Q

angle molar classifications

A

Class I, II, and III

54
Q

what is Class I molar

A

59% - considered ideal relationship

55
Q

what is Class II molar

A

39% - includes end-end (end-on) Class II

56
Q

angle molar classification determined by what

A

determined by relationship of mesial buccal cusp of max first molar and mesial buccal groove of mand 1st perm molar

57
Q

what class molar relationship

A

class I

58
Q

what class molar relationship

A

class II (full/classic)

59
Q

what class molar relationship

A

Class II (end-on, end-end)

60
Q

what class molar relationship

A

class III

61
Q

what molar classification

A

class I

62
Q

what are the two types of class II molar relationships

A

division 1 and division 2

63
Q

division 1 class II molar relationship

A

excessive overjet

64
Q

division 2 class II molar relationship

A

lingual tipping of max CI, normal to minimal overjet, deep bite, crowding/overlap between max central and lateral incisors

65
Q

molar classification

A

class II, division 1

66
Q

molar classification

A

class II, division II “rabbited max incisors”

67
Q

ideal molar and canine relationships in perm occlusion

A

Class I molar and Class I canine

68
Q

ideal perm occlusion:

type of proximal contacts

A

tight

69
Q

ideal perm occlusion:

marginal ridges

A

should have even marginal ridges vertically

70
Q

ideal perm occlusion:

occlusal plane

A

flat

71
Q

ideal perm occlusion:

tooth rotatations?

A

no

72
Q

ideal perm occlusion:

overjet

A

2-4mm

73
Q

ideal perm occlusion:

overbite

A

10-70%

23 Growth and Development (11 decks)

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