Dental Chronology Flashcards
what are the parameters of dental chronology
calcification start
crown complete
eruption
root completion
what are the parameters which allow visible radiographies
calcification start
crown completion
what is major about eruption
assess correct ‘dental age’
detect abnormalities in eruption
whats root completion important for
endodontics
root lengthen 2-3 years after closes off
at birth what is present orally
gum pads
what are the gum pads
over A-D's sep by tongue \+ve OJ U.e teeth overcrowded rapid growth 1st year
what is the dentition like at 6 weeks i.u
both development starts
what is the dentiiotn like 2rd-4th month i.u
tooth germ forms
what is dentiotn like at 3rd-6th months i.u
calcification starts
what is dentition like at 6-7 months after born
first teeth erupted
what is dentition like at about 2.5 year
deciduous dentition complete
what si the eruption order of deciduous dentition
lower A upper A lower B upper B d's c's E's
when do lower e’s erupt
6 months
when do upper a’s erupt
7 months
when do lower b’s erupt
7 months
when do upper b’s erupt
8 months
when do d’s form
12-16 months
when do c’s form
16-20 months
when do e’s erupt
20-30 months
why do D’s erupt before C’s
stabilise occlsion
what is the order of calcification of deciduous teeth in utero
a's b's c's d's e's
when are all the teeth calcified in utero
a's - 3-4.5 months b's - 4.5 c's - 5 d's - 5 e's - 6
when does all the crown completion take place
a's - 4 months b's - 4.5-5 c's - 9 d's - 6 e's - 10-12
when is deciduous dentition root completion occur
1-1.5 years after completion
when is there a full set of deciduous dentiiotn
6 years
what is a mechanism for prevention of overlap or crowding
incision spacing
arthropod (primitive) spaces
flush distal edges of E’s
attrition
what are the anthropoid primitive spaces
distal to upper B
distal to lower C
what is flush distal surface
e straight no step fro 6 until teeth worn and in right situ
what is significant about age 6
eruption permanent dentition
deciduous teeth start to be shed
mixed dentition
what are the first permanent teeth to erupt
6’s erupt first then lower 1’s
when does permeant 6 erupt
6-7 years
when do lower and upper 1’s erupt
lower - 6-7 years
upper 7-8 years
when do upper and lower 2’s erupt
upper 8-9 year
lower 7-8 years
when do lower and upper 3’s erupt
lower 9-10 years
upper 11-12 years
when do 4’s erupt
10-12 years
when do 5’s erupt
10-12 years
when do 7’s erupt
12-13 years
when do 8’s erupt
17-21 years
when do 6’s first sign of calcification
around birth or just before
when do 7’s show calcification start
2.5-3.5 years
when do 8’s show calcification strat
7-9 years upper
8-10 years lower
when do rest of teeth show calcification start
during first 2 years
when does 1 and 2’s crown completion
4-5 years
when does 3 crown completion
6-7 years
when does 4 crown completion
5-6 years
when does 5 crown completion
6-7 years
when does 6 crown completion
2.5-3 year
when does 7 crown completion
7-8 years
when does 8 crown completion
12-16 years
when is permanent root compeltion
2-3 years after eruptio
what is a common implication of eruption problems
symmetrical
delays may indicate a problem
what are some common eruption problems
natal teeth
submergences
delayed eruption
what are natal teeth
early eruption @ birth
what are submergences
ankylosis
fuse to bone back down
what are some reasons for delayed eruption
downs
resorption due to trauma
dilaceration
supernumeraries
what is dilaceration
developmental problems wrong tooth form at right angle (L) shape
what can delayed eruption cause
early deciduous loss and bone fomratio abnormal path eruption impaction crowding congenital absence
