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Developmental Biology > Dental Chronology > Flashcards

Dental Chronology Flashcards

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1
Q

what are the parameters of dental chronology

A

calcification start
crown complete
eruption
root completion

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2
Q

what are the parameters which allow visible radiographies

A

calcification start

crown completion

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3
Q

what is major about eruption

A

assess correct ‘dental age’

detect abnormalities in eruption

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4
Q

whats root completion important for

A

endodontics

root lengthen 2-3 years after closes off

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5
Q

at birth what is present orally

A

gum pads

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6
Q

what are the gum pads

A 
over A-D's 
sep by tongue
\+ve OJ
U.e teeth overcrowded
rapid growth 1st year
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7
Q

what is the dentition like at 6 weeks i.u

A

both development starts

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8
Q

what is the dentiiotn like 2rd-4th month i.u

A

tooth germ forms

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9
Q

what is dentiotn like at 3rd-6th months i.u

A

calcification starts

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10
Q

what is dentition like at 6-7 months after born

A

first teeth erupted

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11
Q

what is dentition like at about 2.5 year

A

deciduous dentition complete

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12
Q

what si the eruption order of deciduous dentition

A 
lower A
upper A
lower B 
upper B 
d's
c's
E's
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13
Q

when do lower e’s erupt

A

6 months

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14
Q

when do upper a’s erupt

A

7 months

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15
Q

when do lower b’s erupt

A

7 months

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16
Q

when do upper b’s erupt

A

8 months

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17
Q

when do d’s form

A

12-16 months

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18
Q

when do c’s form

A

16-20 months

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19
Q

when do e’s erupt

A

20-30 months

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20
Q

why do D’s erupt before C’s

A

stabilise occlsion

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21
Q

what is the order of calcification of deciduous teeth in utero

A 
a's
b's
c's
d's
e's
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22
Q

when are all the teeth calcified in utero

A 
a's - 3-4.5 months
b's - 4.5
c's - 5
d's - 5
e's - 6
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23
Q

when does all the crown completion take place

A 
a's - 4 months
b's - 4.5-5 
c's - 9
d's - 6 
e's - 10-12
24
Q

when is deciduous dentition root completion occur

A

1-1.5 years after completion

25
Q

when is there a full set of deciduous dentiiotn

A

6 years

26
Q

what is a mechanism for prevention of overlap or crowding

A

incision spacing
arthropod (primitive) spaces
flush distal edges of E’s
attrition

27
Q

what are the anthropoid primitive spaces

A

distal to upper B

distal to lower C

28
Q

what is flush distal surface

A

e straight no step fro 6 until teeth worn and in right situ

29
Q

what is significant about age 6

A

eruption permanent dentition
deciduous teeth start to be shed
mixed dentition

30
Q

what are the first permanent teeth to erupt

A

6’s erupt first then lower 1’s

31
Q

when does permeant 6 erupt

A

6-7 years

32
Q

when do lower and upper 1’s erupt

A

lower - 6-7 years

upper 7-8 years

33
Q

when do upper and lower 2’s erupt

A

upper 8-9 year

lower 7-8 years

34
Q

when do lower and upper 3’s erupt

A

lower 9-10 years

upper 11-12 years

35
Q

when do 4’s erupt

A

10-12 years

36
Q

when do 5’s erupt

A

10-12 years

37
Q

when do 7’s erupt

A

12-13 years

38
Q

when do 8’s erupt

A

17-21 years

39
Q

when do 6’s first sign of calcification

A

around birth or just before

40
Q

when do 7’s show calcification start

A

2.5-3.5 years

41
Q

when do 8’s show calcification strat

A

7-9 years upper

8-10 years lower

42
Q

when do rest of teeth show calcification start

A

during first 2 years

43
Q

when does 1 and 2’s crown completion

A

4-5 years

44
Q

when does 3 crown completion

A

6-7 years

45
Q

when does 4 crown completion

A

5-6 years

46
Q

when does 5 crown completion

A

6-7 years

47
Q

when does 6 crown completion

A

2.5-3 year

48
Q

when does 7 crown completion

A

7-8 years

49
Q

when does 8 crown completion

A

12-16 years

50
Q

when is permanent root compeltion

A

2-3 years after eruptio

51
Q

what is a common implication of eruption problems

A

symmetrical

delays may indicate a problem

52
Q

what are some common eruption problems

A

natal teeth
submergences
delayed eruption

53
Q

what are natal teeth

A

early eruption @ birth

54
Q

what are submergences

A

ankylosis

fuse to bone back down

55
Q

what are some reasons for delayed eruption

A

downs
resorption due to trauma
dilaceration
supernumeraries

56
Q

what is dilaceration

A

developmental problems wrong tooth form at right angle (L) shape

57
Q

what can delayed eruption cause

A 
early deciduous loss and bone fomratio 
abnormal path eruption
impaction
crowding 
congenital absence

Developmental Biology (12 decks)

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