Dental Chronology

Question 1

what are the parameters of dental chronology

Answer 1

calcification start
crown complete
eruption
root completion

Question 2

what are the parameters which allow visible radiographies

Answer 2

calcification start

crown completion

Question 3

what is major about eruption

Answer 3

assess correct ‘dental age’

detect abnormalities in eruption

Question 4

whats root completion important for

Answer 4

endodontics

root lengthen 2-3 years after closes off

Question 5

at birth what is present orally

Answer 5

gum pads

Question 6

what are the gum pads

Answer 6

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

Question 7

what is the dentition like at 6 weeks i.u

Answer 7

both development starts

Question 8

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

Answer 8

tooth germ forms

Question 9

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

Answer 9

calcification starts

Question 10

what is dentition like at 6-7 months after born

Answer 10

first teeth erupted

Question 11

what is dentition like at about 2.5 year

Answer 11

deciduous dentition complete

Question 12

what si the eruption order of deciduous dentition

Answer 12

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

Question 13

when do lower e’s erupt

Answer 13

6 months

Question 14

when do upper a’s erupt

Answer 14

7 months

Question 15

when do lower b’s erupt

Answer 15

7 months

Question 16

when do upper b’s erupt

Answer 16

8 months

Question 17

when do d’s form

Answer 17

12-16 months

Question 18

when do c’s form

Answer 18

16-20 months

Question 19

when do e’s erupt

Answer 19

20-30 months

Question 20

why do D’s erupt before C’s

Answer 20

stabilise occlsion

Question 21

what is the order of calcification of deciduous teeth in utero

Answer 21

a's
b's
c's
d's
e's

Question 22

when are all the teeth calcified in utero

Answer 22

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

Question 23

when does all the crown completion take place

Answer 23

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

Question 24

when is deciduous dentition root completion occur

Answer 24

1-1.5 years after completion

Question 25

when is there a full set of deciduous dentiiotn

Answer 25

6 years

Question 26

what is a mechanism for prevention of overlap or crowding

Answer 26

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

Question 27

what are the anthropoid primitive spaces

Answer 27

distal to upper B | distal to lower C

Question 28

what is flush distal surface

Answer 28

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

Question 29

what is significant about age 6

Answer 29

eruption permanent dentition deciduous teeth start to be shed mixed dentition

Question 30

what are the first permanent teeth to erupt

Answer 30

6's erupt first then lower 1's

Question 31

when does permeant 6 erupt

Answer 31

6-7 years

Question 32

when do lower and upper 1's erupt

Answer 32

lower - 6-7 years | upper 7-8 years

Question 33

when do upper and lower 2's erupt

Answer 33

upper 8-9 year | lower 7-8 years

Question 34

when do lower and upper 3's erupt

Answer 34

lower 9-10 years | upper 11-12 years

Question 35

when do 4's erupt

Answer 35

10-12 years

Question 36

when do 5's erupt

Answer 36

10-12 years

Question 37

when do 7's erupt

Answer 37

12-13 years

Question 38

when do 8's erupt

Answer 38

17-21 years

Question 39

when do 6's first sign of calcification

Answer 39

around birth or just before

Question 40

when do 7's show calcification start

Answer 40

2.5-3.5 years

Question 41

when do 8's show calcification strat

Answer 41

7-9 years upper | 8-10 years lower

Question 42

when do rest of teeth show calcification start

Answer 42

during first 2 years

Question 43

when does 1 and 2's crown completion

Answer 43

4-5 years

Question 44

when does 3 crown completion

Answer 44

6-7 years

Question 45

when does 4 crown completion

Answer 45

5-6 years

Question 46

when does 5 crown completion

Answer 46

6-7 years

Question 47

when does 6 crown completion

Answer 47

2.5-3 year

Question 48

when does 7 crown completion

Answer 48

7-8 years

Question 49

when does 8 crown completion

Answer 49

12-16 years

Question 50

when is permanent root compeltion

Answer 50

2-3 years after eruptio

Question 51

what is a common implication of eruption problems

Answer 51

symmetrical | delays may indicate a problem

Question 52

what are some common eruption problems

Answer 52

natal teeth submergences delayed eruption

Question 53

what are natal teeth

Answer 53

early eruption @ birth

Question 54

what are submergences

Answer 54

ankylosis | fuse to bone back down

Question 55

what are some reasons for delayed eruption

Answer 55

downs resorption due to trauma dilaceration supernumeraries

Question 56

what is dilaceration

Answer 56

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

Question 57

what can delayed eruption cause

Answer 57

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